Injection Timing

Top PDF Injection Timing:

Effect of Injection Timing on Performance and Combustion Characteristics of a Diesel Engine Fuelled with Diesel and Methyl Ester of Sunflower oil

Effect of Injection Timing on Performance and Combustion Characteristics of a Diesel Engine Fuelled with Diesel and Methyl Ester of Sunflower oil

The purpose of the fuel injection system is to deliver fuel into the engine cylinders, while precisely controlling the injection timing, fuel atomization, and other parameters. The main types of injection systems include pump-line-nozzle, unit injector, and common rail. Modern injection systems reach very high injection pressures, and utilize sophisticated electronic control methods. The performance of diesel engines is heavily influenced by their injection system design. In fact, the most notable advances achieved in diesel engines resulted directly from superior fuel injection system designs. While the main purpose of the system is to deliver fuel to the cylinders of a diesel engine, it is how that fuel is delivered that makes the difference in engine performance, emissions, and noise characteristics. The primary purposes of the diesel fuel injection system are graphically represented in plate 1.
Show more

15 Read more

Effect of injection timing on the performance and emissions of biodiesel
fuelled diesel engine

Effect of injection timing on the performance and emissions of biodiesel fuelled diesel engine

The engine performance with HOME oil was tested at injection timings of 19°, 23°, and 27°BTDC. For standard diesel, the engine was tested at the specified crank angle of 23°. Fig. 2 shows the effect of injection timing on BTE of CI engine operation with HOME at three injection timings. It can be seen that as the injection timing increases from 19° to 27°, BTE of the engine increases. However, at 23° BTDC, diesel performs much better than the HOME oil. In fact, the highest BTE was obtained with diesel at a static injection timing of 23° BTDC.
Show more

5 Read more

Effect of Injection Timing on Performance and Emission Characteristics of Diesel Engine Fuelled with Soya Ethyl Ester Blends

Effect of Injection Timing on Performance and Emission Characteristics of Diesel Engine Fuelled with Soya Ethyl Ester Blends

In the present work the impact of static injection timing, on execution, ignition and discharge qualities of diesel motor powered with diesel and soya ethyl ester biodiesel has been contemplated. The info parameters differed amid the investigations are load torque, motor speed and static injection timing. The yield parameters investigated are brake particular fuel utilization (BSFC), brake warm effectiveness (BTE), barrel weight, crest chamber weight (Pmax), net warmth discharge rate (HRR), carbon monoxide (CO), unburned hydro-carbon (HC), oxides of nitrogen (NO) and smoke thickness. The impacts of variety of info parameters on the above yield parameters have been contemplated and thought about amongst diesel and Soya ethly ester biodiesel operation. At last ideal injection timing is resolved for greatest execution and least discharges of Soya ethly ester biodiesel motor
Show more

6 Read more

Influence of Injection Timing on the Performance of Dual Fuel Compression Ignition Engine with Exhaust Gas Recirculation

Influence of Injection Timing on the Performance of Dual Fuel Compression Ignition Engine with Exhaust Gas Recirculation

Some investigations have been dedicated to the investigation of the feasibility of using gaseous fuels as alternative engine fuels from both performance and emissions perspectives. The effect of injection timing of pilot fuel and pilot fuel quantity on the performance and emissions of an indirect diesel engine fueled with methane or propane is investigated and is shown that the low efficiency and poor emissions at light loads can be improved significantly by advancing the injection timing of the pilot fuel or increasing the amount of pilot fuel, while increasing the amount of pilot fuel at high loads led to early knocking. The cycle-to-cycle combustion variation as reflected in the combustion pressure data of a single cylinder, naturally aspirated engine converted to run as dual fuel engine on diesel and gaseous fuel of LPG or methane have been studied under various combination of engine operating and design parameters[4].
Show more

7 Read more

Optimization of Injection Pressure and Injection Timing of a Diesel Engine Fuelled with Optimized Blend of B25 Cotton Seed Oil Biodiesel

Optimization of Injection Pressure and Injection Timing of a Diesel Engine Fuelled with Optimized Blend of B25 Cotton Seed Oil Biodiesel

Implementation of biodiesel in India will lead to many advantages like green cover to waste land, support to agriculture, rural economy, reduction in dependence on imported crude oil and reduction in air pollution [15]. Currently, India is spending about Rs.80, 000 million per year for importing 70% of petroleum fuels and produces only 30% of the total fuel requirements. It is estimated that mixing of 5% of biodiesel fuel to the present diesel fuel can save Rs.40, 000 million per year. The objective of the present study is to find the optimum injection pressure and injection timing of a diesel engine for the optimized blend of B25 cotton seed oil biodiesel.
Show more

7 Read more

Effects of Equivalence Ratio on Performance and Emissions of Diesel Engine with Hydrogen and Water Injection System at Variable Injection Timing

Effects of Equivalence Ratio on Performance and Emissions of Diesel Engine with Hydrogen and Water Injection System at Variable Injection Timing

Abstract-- This paper aims to develop a comprehensive development and research for performance and emissions of diesel engine fueled with hydrogen and water at variable injection timing. Experiments have been conducted to compare the performance and emissions between diesel alone, diesel with hydrogen and hydrogen-diesel and water injection pressure. addition of hydrogen into diesel engine resulted in higher pressure which lead to huge indicated work. Furthermore, injecting water into diesel engine with hydrogen mixture indicated a desirable outcome. Existence of water in combustion slightly decreased the amount of emissions but opposite in term of performance. The fact is water injection exist in combustion will absorb a portion of heat release which will result low in combustion process thus lead to low in performance production otherwise production of NOx emission is low. In conclusion, humidification in combustion engine is a great idea toward a high performance and low in emissions production compared to diesel alone operation which leads to a green technology production.
Show more

6 Read more

Effect of Injection Timing on Compression Ignition Engine Fuelled with Thevetia Peruviana Biodiesel

Effect of Injection Timing on Compression Ignition Engine Fuelled with Thevetia Peruviana Biodiesel

Pradeep at el. [1] studied influence of injection timing on emission parameters of Adelfa biodiesel (Nerium oil methyl ester – NOME) fuelled DI CI engine. In that work, transesterifiedAdelfa oil (Nerium oil methyl ester – NOME) was used as the test fuel and the results were compared with diesel fuel. The injection timing was retarded to 24°BTDC and advanced to 30°BTDC and 33°BTDC. Results showed that, for all load conditions and for all injection timings the brake thermal efficiency was found to be maximum at three fourth of load condition. The maximum efficiency was obtained with diesel fuel to a value 25.608%. The decrease in the efficiency were found to be 11.71%, 3.71% and 3.87% when the injection timings were 24°BTDC, 27°BTDC and 33°BTDC. The brake thermal efficiency was found to be 25.502% when the injection timing was 30°BTDC.
Show more

11 Read more

Influence of injection timing on the performance and emissions of a dual 
		fuel engine

Influence of injection timing on the performance and emissions of a dual fuel engine

In this work, a 6.8L John Deere 6068H compression ignition engine is coupled with an aftermarket dual fuel kit and converted to dual fuel engine. This dual fuel kit enables the diesel engine to run on diesel and gaseous fuels. The engine is a six-cylinder turbocharged after cooled four-stroke cycle diesel engine. The engine has a maximum power output of 205kW at 2400rpm and the compression ratio is 17:1. The experiment is conducted to investigate the effect of injection timing variations on the combustion and emissions in dual fuel engine. The dual fuel engine is tested through five different load points while the speed is maintained constant at 1800rpm. The gaseous fuel used is natural gas and the performance characteristics are compared with baseline dual fuel engine with nominal injection timing. The dual fuel engine has a nominal injection timing of 6.5° before top dead center (BTDC) at 12, 25, 50 and 75% loads and 4.8° BTDC at 100% load. The injection timings are then varied between 0° to 16° BTDC. Data for combustion duration, ignition delay, peak pressure, combustion stability, nitrogen oxides (NOx), carbon monoxides (CO) and total hydrocarbon emissions are presented. Results showed that by advancing the timing away from the nominal start of injection (SOI) timing, useful power is increased over 70%. The combustion stability is also increased with these advancements. Whereas, the ignition delay and flame propagation does not show any improvement as the ignition starts or earlier than the nominal timing. Hydrocarbons and CO emissions are reduced over 30% at advanced SOI at intermediate BMEP, however NOx emission increases at advanced injection timings with over 30% increment at all BMEPs.
Show more

10 Read more

Performance Analysis of C I  Engine using Biodiesel Fuel by Modifying Injection Timing and Injection Pressure

Performance Analysis of C I Engine using Biodiesel Fuel by Modifying Injection Timing and Injection Pressure

Table 8 shows the load versus brake power, s.f.c., brake thermal efficiency, and exhaust gas temperature for CI engine with biodiesel fuel. Fuel injection timing and pressure has a major influence on engine performance, combustion, and emission, and these impacts have mainly executed in case of late injection cases. But, for advance injection timing with normal pressure and high heat liberation will attain high values. For homogeneous charging combustion operation engine, compression stroke at advance injection timing and normal pressure has been set to ensure better fuel/air mixture quickly. For the end of the ignition, it has B.P. 0.2261 kW, s.f.c. 1.4371 kg/kW-hr, and brake thermal efficiency 7.84% at 0.25 kW load while B.P. 2.3019 kW, s.f.c. 0.4377 kg/kW-hr, and brake thermal efficiency 25.74% at 2.75 kW load.
Show more

11 Read more

Influence of Injection Timing on Performance and Combustion Characteristics of Simarouba Biodiesel Engine

Influence of Injection Timing on Performance and Combustion Characteristics of Simarouba Biodiesel Engine

ABSTRACT: Efforts are being made throughout the World to reduce the consumption of liquid petroleum fuels wherever is possible. Biodiesel is recently gaining prominence as a substitute for petroleum based diesel mainly due to environmental considerations and depletion of vital resources like petroleum and coal. According to Indian scenario, the demand for petroleum diesel is increasing day by day hence there is a need to find out an appropriate solution. This study investigates influence of injection timing of 20% blend Simarouba biodiesel on performance and combustion characteristics. The effect of varying injection timing was evaluated in terms of thermal efficiency, specific fuel consumption, heat release rate and peak cylinder pressure. By retarding injection timing brake thermal efficiency can be improved of S20
Show more

8 Read more

Investigation of injection timing and different fuels on the diesel engine performance and emissions

Investigation of injection timing and different fuels on the diesel engine performance and emissions

Start of fuel injection and fuel type are two important factors affecting engine performance and exhaust emissions in internal combustion engines. In the present study, a one-dimensional computational fluid dynamics solution with GT-Power software is used to simulate a six-cylinder diesel engine to study the performance and exhaust emissions with different injection timing and alternative fuels. Starting the fuel injection was from 10 °CA BTDC to the TDC with an interval between two units and from alternative fuel bases (diesel), including methanol, ethanol, diesel, and ethanol compounds, biodiesel and decane was used. To validate the model, a comparison is made between simulation data and experimental data (including torque and power) showing the validation error is less than 6.12% and indicating the software model validation. Also, the modeling results show that decane fuel has higher brake power and brake torque of more than 6.10 % while fuel is injected at 10 °CA BTDC compared to the base fuel, and illustrates a reduction of 5.75 % in specific fuel consumption due to producing higher power. In addition, with the advance of injection timing compared to baseline, the amount of CO and HC in biodiesel fuel reduces to 83.88% and 64.87%, respectively, and the lowest NOX emission with the retardation of starting injection, to decane fuel is awarded. In general, the results show that decane fuel could be a good alternative to diesel fuel in diesel engines when it starts fuel injection at 10 °CA BTDC.
Show more

12 Read more

Influence of Injection Timing on the Performance, Emissions, Combustion Analysis and Sound Characteristics of Nerium Biodiesel Operated Single Cylinder Four Stroke Cycle Direct Injection Diesel Engine

Influence of Injection Timing on the Performance, Emissions, Combustion Analysis and Sound Characteristics of Nerium Biodiesel Operated Single Cylinder Four Stroke Cycle Direct Injection Diesel Engine

The engine was operated initially on diesel for warm up and then with Nerium oil blends. The experiment aims at deter mining appropriate proportions of biodiesel and diesel for which higher efficiency was obtainable. Hence experiments were conducted for different proportions of biodiesel mixed with diesel. The blends were in the ratio 20%, 40%, 60%, 80%, and 100% with diesel. First these blends were tested at normal injection timing 27° BTDC at constant injection pressure 200 bar and with a constant compression ratio 17.5.Then for the best efficiency blend, the test were conducted at three different injection timings 24° BTDC, 30° BTDC and 33° BTDC and above procedure was followed. Shims were used to change the injection timings
Show more

7 Read more

Effect of Injection Timing and Compression Ratio on Performance, Combustion and Emission Characteristics of a Variable Compression Ratio Engine Fueled with Mango Seed Methyl Ester

Effect of Injection Timing and Compression Ratio on Performance, Combustion and Emission Characteristics of a Variable Compression Ratio Engine Fueled with Mango Seed Methyl Ester

1) Brake power and Brake thermal efficiency: Fig. 2a shows the variation of BTHE with BP for different compression ratios (14, 16, 18) and injection timings (21 0 , 23 0 , 25 0 BTDC). BTHE is linearly increasing with BP and CR. Among all compression ratio and injection timing, CR18 IT 21 0 BTDC (In the Fig. 2c) exhibited higher brake thermal efficiency (28.86%) at full load condition while at standard injection timing (23 0 BTDC) is 28.65%. Retarding injection timing increases the BTHE for biodiesel may be due to fast start and complete combustion of biodiesel blend B20 [23].
Show more

9 Read more

COMPUTATIONAL STUDIES OF SWIRL RATIO AND INJECTION TIMING ON ATOMIZATION IN A DIRECT INJECTION DIESEL ENGINE

COMPUTATIONAL STUDIES OF SWIRL RATIO AND INJECTION TIMING ON ATOMIZATION IN A DIRECT INJECTION DIESEL ENGINE

Advancing the injection timing with respect to TDC results in increase in the cylinder pressure due to increased delay period. The in- cylinder pressure and temperature is higher for the case when the time of start of injection is 20 deg bTDC as compared to the case of 6 deg bTDC. This leads to a 15 % increase in cylinder pressure from injection timing of 6 deg bTDC to 20 deg bTDC. These numerically simulated values are in good agreement with Jayashankara and Ganesan (2010). The delay period is almost doubled when the injection timing is varied from 6 deg bTDC to 13 deg bTDC, resulting in increase of peak cylinder pressure from 81 bar to 89 bar. However, the peak pressure falls to 86 bar as injection timing is ther advanced to 693 deg CA i.e. 27 deg bTDC. This is because the in-cylinder temperature might not be sufficient at 693 deg CA for the fuel-air mixture to attain auto-ignition and thereby leads to a slightly lower peak pressure. Hence, the in- cylinder and droplet variables are compared between 6 to 20 deg bTDC injection timings. As in-cylinder peak pressure is higher with injection timing of 20 deg bTDC, the in-cylinder peak temperature is also higher at the same injection timing. It is observed that there is an increase in
Show more

9 Read more

Numerical Investigation on the Effect of Injection Timing on Combustion and Emissions in a DI Diesel Engine at Low Temperature Combustion Condition

Numerical Investigation on the Effect of Injection Timing on Combustion and Emissions in a DI Diesel Engine at Low Temperature Combustion Condition

compared to SOI at 8.5 ºCA BTDC. This is due to larger wall film formation and insufficient time for mixing at early stages of combustion. But, owing to the increase of soot oxidation rate at homogenous mixture at later crank angle, overall soot is decreased at 17.5 BTDC compared to 8.5 ºCA BTDC injection timing. Fig. 22 indicates soot level at EVO for different injection timings at 58% EGR rate and baseline case. As can be seen, soot emission level is for early start of injection timings and specially, in SOI at 23.5 ºCA BTDC, consequently the very long ignition delays and adequate time for mixture formation. Therefore, advanced injection timings earlier than 20.5 ºCA BTDC at 58% cooled EGR rate obviously reduce the soot emission in compared to baseline case. The corresponding NO x emission history at
Show more

15 Read more

Combined effect of ignition and injection timing along with hydrogen enrichment to natural gas in a direct injection engine on performance and exhaust emission

Combined effect of ignition and injection timing along with hydrogen enrichment to natural gas in a direct injection engine on performance and exhaust emission

To improve the engine performance and reduce emissions, factors such as changing ignition and injection timing along with converting of port injection system to direct injection in SI(spark-ignited) engines and hydrogen enrichment to CNG fuel at WOT conditions have a great importance. In this work, which was investigated experimentally (for CNG engine) and theoretically (for combustion Eddy Break-Up model and turbulence model is used) in a single- cylinder four-stroke SI engine at various engine speeds (2000-6000 rpm in 1000 rpm intervals), injection timing (130-210 crank angle(CA) in 50 CA intervals), ignition timing (19-28 CA in 2 degree intervals), 20 bar injection pressure and five hydrogen volume fraction 0% to 50% in the blend of HCNG. The results showed that fuel conversion efficiency, torque and power output were increased, while duration of heat release rate was shortened and found to be advanced. NOx emission was increased with the increase of hydrogen addition in the blend and the lowest NOx was obtained at the lowest speed and retarded ignition timing, hence 19° before top dead center.
Show more

20 Read more

EXPERIMENTAL INVESTIGATION AND MODELING OF A FOUR STROKE SINGLE CYLINDER DI DIESEL ENGINE UNDER VARIOUS INJECTION TIMINGS

EXPERIMENTAL INVESTIGATION AND MODELING OF A FOUR STROKE SINGLE CYLINDER DI DIESEL ENGINE UNDER VARIOUS INJECTION TIMINGS

For diesel engines, a significant research effort has been directed towards using vegetable oils and their derivatives as fuels. Biodiesel is considered a promising alternative fuel for use in diesel engines, boilers and other combustion equipment. Although biodiesel has many advantages over diesel fuel, there are several problems that need to be addressed such as its lower calorific value, higher flash point, higher viscosity, poor cold flow properties, poor oxidative stability and sometimes its comparatively higher emission of nitrogen oxides. It is found that the lower concentrations of biodiesel blends improve the thermal efficiency. Since the introduction of petroleum fuels, the development of compression ignition (CI) engines has been done keeping the properties of 'mineral diesel' fuel in front. The present designs and operating parameters of available engines are standardised for this fuel only. For all other fuels, the operating parameters must be re-set based on the specific fuel properties. The performance and emission characteristics of diesel engines depends on various factors like fuel quantity injected, fuel injection timing, fuel injection pressure, shape of combustion chamber, multiple injection, injection system, nozzle specification, compression ratio, fuel spray pattern, air swirl etc. Injection pressure and compression ratio, have been studied with various engines and oils [ Dhananjaya et al., (2009), Huang Z. et al., (2004), Jindal S. (2011), Raghu, R. and Ramadoss, G., (2011), Park, S.H. et al., (2011), Pandian, M. et al., (2009), Muralidharan, K. et al., (2009), Jindal, S., (2010) ]. Most of the research studies concluded that in the existing design of engine and parameters at which engines are operating, a 20% blend of biodiesel with diesel works well, but they indicated the need of research in the areas of engine modifications so as to suit to higher blends without severe drop in performance so that the renewability advantages along with emission reduction can be harnessed to a greater extent.
Show more

12 Read more

Effect of varying engine parameters and syngas composition on the 
		combustion characteristics, performance and emission of syngas diesel 
		dual fuel engine  A review

Effect of varying engine parameters and syngas composition on the combustion characteristics, performance and emission of syngas diesel dual fuel engine A review

The future scenario of syngas admixing in the syngas-diesel dual fuel engine could be linked with utilization of different compositions of imitated syngas under diverse supercharging condition. The engine performance, emission and combustion characteristics ought to be examined for different injection timing and load conditions in order to achieve maximum diesel savings at dual fuel operation. Furthermore, the flame propagation should be studied at the same conditions to know what is going inside the engine combustion chamber and support the results for engine combustion characteristic. Besides using powerful multipurpose thermo-fluid dynamics software to simulate the combustion process of syngas/diesel dual fuel engines could be a better option for accurate results. Keeping in view the comparison with previous published data/reports, it could be concluded that, positive and negative effects would be brought with the usage of syngas instead of other gaseous fuels like hydrogen. The positive effects include the low emission of CO 2 and NO X while the negative
Show more

7 Read more

Vol. 2, Issue 10, October 2013

Vol. 2, Issue 10, October 2013

From the Fig.4, it is observed that conventional engine with crude vegetable oil operation at 27 o bTDC recorded marginally higher EGT at all loads compared with CE with pure diesel operation. Temperature of exhaust gases, leaving the engine cylinder represents the extent of temperature reached in the cylinder during combustion. It is observed that, with increasing load the cylinder pressure increased and more of the fuel is burnt leading to an increase in temperatures as shown in Figure 4. The temperature of exhaust gases was observed to be lower with fossil diesel as compared to vegetable oil for entire range of power output. Though calorific value (or heat of combustion) of fossil diesel is more than that of crude vegetable oil, its density is less in comparison with vegetable oil. Therefore lesser the heat is released in the combustion chamber leading to generate lower temperature with diesel operation on conventional engine. Also, there is an advanced combustion of crude vegetable oil due to its higher bulk modulus. However its cetane number is less when compared to fossil diesel. Hence there is no effect of bulk modulus on injection timing (advance or retardation) and heat release. Vegetable oil operation on conventional engine exhausted more amount of heat in comparison with pure diesel operation on CE. Lower heat release rates [23] and retarded heat release [23] associated with high specific energy consumption caused increase in exhaust gas temperature in conventional engine. Ignition delay in the conventional engine with different operating conditions of vegetable oil increased the duration of the burning phase. At recommended injection timing. LHR engine recorded lower value of exhaust gas temperature when compared with conventional engine with vegetable oil operation. This was due to reduction of ignition delay in the hot environment with the provision of the insulation in the LHR engine, which caused the gases expanded in the cylinder giving higher work output and lower heat rejection. This showed that the performance improved with LHR engine over CE with vegetable oil operation. The value of exhaust gas temperature decreased with advancing of the injection timing with both versions of the engine with vegetable oil operation. At the respective optimum injection timings, the value of exhaust gas temperature was lower with LHR engine than that of conventional engine with vegetable oil operation. This was due to more conversion of heat into work with LHR engine than conventional engine.
Show more

20 Read more

Internal combustion engines progress and prospects.pdf

Internal combustion engines progress and prospects.pdf

Furthermore, Selim [54] analyzed the mechanism of combus- tion noise and its cyclic variations in a single cylinder diesel engine using diesel – lique fi ed petroleum gas (LPG) and diesel – methane dual-fuels. The test results indicated higher combustion noise and cyclic variations under diesel – LPG dual-fuel combustion than diesel – methane dual-fuel combustion. Also, by the in fl uence of various strategies like increasing CR, advancing the injection timing, and by increasing the mass of pilot fuel exhibited an analogous trend. However, the combustion noise and its cyclic variations were drastically reduced with decreasing engine speeds. Yet another study by Saleh [55] uncovered the effects of varying LPG compositions on dual-fuel engine performance and emission characteristics. The study indicated that dual-fuel comprising 40% mass fraction of diesel fuel with roughly 30% butane content in LPG would improve the engine operating characteristics.
Show more

12 Read more

Show all 9147 documents...