Root effects were studied for the two roots available - fir tree and dovetail. The appropriate disk was rigidly attatched to the large steel table. Centrifugal force effects were simulated by loading the blades axially. The electrodynamic shaker was then fixed to the blade near the tip using tv/o rollers in the jig to create a pinned connection. The amount of total damping of the system for various axial loads up to 80 lbs. was determined by the resonance bandwidth method. The system aerodynamic and hysteric damping value was then determined by repeating the above tests with the root rigidly fixed with epoxy resin cement. Rootdamping was then found by subtraction of the aerodynamic and hysteretic damping value from the total damping value at each load. Vibration amplitude was monitored by accelerometer with readout on the
III. T ESTING WITH V ARIABLE P ARAMETERS Fig.3. shows the block diagram of experimental set-up, includes wind turbineblade is mounted on electrodynamic shaker and one accelerometer is mounted on blade and second accelerometer is mounted on electrodynamic shaker. Signals from accelerometers are send to digital vibration controller then to power amplifier. All results are displayed on CPU and display unit. Electrodynamic shaker (EEV 060) having force rating of 600 Kgf is use for generating frequency in the range of 10 Hz to 2000 Hz and acceleration is consider for the first two modes. We consider 1 Kw wind turbineblade for testing which is mounted at the root location and hermetically sealed type piezo electric accelerometer is mounted at the position of 600 mm randomly considering the maximum displacement location.
The finite element method (FEM) is very useful and has mostly been used in the development of wind turbine blades. The FE simulation usually predicts the global stresses with high quality accuracy. Local deformations and stresses are often difficult to predict. And hence only a little detailing has been included in this work. Because the highly localised deformations and stresses can be nonlinear, while the global response appears linear for relatively small deflections. Another reason is that the global behaviour can be represented by a relatively simple model, while a computationally expensive 3D solid model may be necessary to predict this localised behaviour. A 3D solid model even it is highly detailed it would rarely be possible to predict deformations or stresses accurately without calibration of the FE model.
7. Then this 2-D sketch is converted into a 3-D element by using PAD DEFINITION after exiting the work bench. 8. Then to create the base of the turbineblade work bench is selected and drawn to the required dimensions as mentioned in the specifications.
In this paper a modal Analysis is performed on the turbineBlade and turbine rotor disk to obtain its dynamic characteristic by subjecting the blade in CFFF boundary condition. The Analysis has carried in two phases’ i.e modeling and Modal Analysis. Firstly blade and blade disk is modeled with the help of Pro E and imported in ANSYS 14.5, in modal Analysis FEA of blade has been carried out with adopting different case study such for different material, presence of cutout, varying cutout number and parameter. Results showed that both natural frequencies and mode shapes were almost identical and shows good agreement with the experimental data which is stated in literature.
Steam turbine is an excellent prime mover to convert heat energy of steam to mechanical energy. Of all heat engines and prime movers the steam turbine is nearest to the best and it is widely used in power plants and in all industries where power is needed for process.In power generation mostly steam turbine is used because of its greater thermal efficiency and higher power-to-weight ratio. Because the turbine generates rotary motion, it is particularly suited to be used to drive an electrical generator–about 80% of all electricity generation in the world is by use of steam turbines.In this project we are going to design a propeller blade assembly in Catia V5 R21 and thermal analysis is done in Ansys. In order to evaluate the effectiveness of composites and metal propeller using FEA packaged (ANSYS). Thermal analysis is performed on both Aluminum and composite propeller to find out the heat flux and thermal error.
Blade failure is a common experience in power plants using steam or gas turbines. Once in a while, these failures form a part of major incidents. On 19 November 1968, RMS “Queen Elizabeth 2” suffered HP turbineblade failures during its maiden voyage from Tail O’ the bank, resulting in complete damage to the 9 th stage starboard HP turbine rotor and fleeting and Coats . Another major accident occurred on 22 August, 1997, after a major overhaul of a 600 MW turbo-set in porcheville, france, where the last stage blade failed, see frank . The machine under question is a 236 MW nuclear turbine with one single flow HP and one double flow LP cylinder.There are five stages in the HP cylinder and five stages in each flow path of the LP cylinder. A schematic lay out of
According to Nilay Sezer-Uzol and Lyle N. Long (2006), “3D Time Accurate CFD Simulations of Wind Turbine Rotor Flow Fields”, Three-dimensional flow properties of rotating blades are an essential feature of any wind turbine aerodynamic simulation. While important information can be learned from two-dimensional and non- rotating simulations, some aspects of the physics of wind turbine aerodynamics and noise must be obtained from rotating blade simulations. Three dimensional flows over rotating blades can be significantly different than the flow over a wing, and there can also be dramatic differences between 2-D and 3-D simulations.
Steam turbine is an excellent prime mover to convert heat energy of steam to mechanical energy. Of all heat engines and prime movers the steam turbine is best and it is widely used in power plants and in all industries where power is needed for process. In power generation mostly steam turbine is used because of its greater thermal efficiency and higher power-to-weight ratio. Because the turbine generates rotary motion, it is particularly suited to be used to drive an electrical generator–about 80% of all electricity generation in the world is by use of steam turbines. In this project we are going to design a turbineblade assembly in Catia V5 R21 and thermal analysis is done in Ansys. In order to evaluate the effectiveness of steam turbineblade by using FEA (ANSYS).software Thermal analysis is performed on both Aluminum and composite materials to find out the heat flux and thermal error.
Wind turbine is a machine that converts kinetic energy from wind into electrical energy. Wind turbine basically is made up of four main components which is the rotor, the nacelle, the tower and base. The rotating part of a wind turbine, the rotor, is made up of a hub and a few blades. A wind turbineblade which has an aerofoil shape rotates the rotor creating mechanical energy as the wind passes over it. The aerofoil shape of wind turbine blades causes a difference of wind speed passing over the blades. This difference of speed produced high and low pressure system which creates lift force that rotates the blade about the rotor axis. The spinning of the rotor turn the generator inside the wind turbine thus converts the energy into electrical energy. Wind turbine has many different sizes with different capabilities to generate power. Small scale wind turbine with power output lower than 40kW is used to supply power to boat, caravan, and telecommunication tower. Large scale wind turbine can produce power output from 1MW up to 5MW. A wind turbine with power rating between 40kW and 999kW are considered as medium wind turbine.
ABSTRACT: This report describes about the wind power and its potential that can be harnessed in the future to meet the current energy demand. With detailed description of the wind turbine and the wind generator focus has been given on the interconnection of the generators with the grid and the problems associated with it. The shape of the blades is changed to helical so that it can rotate continuously at any direction of wind. Hence the efficiency of the turbine is improved and also the stresses are minimised. Conclusions were made about the behaviour of the wind in urban location. Thereafter, the helix angle of the blade is changed and the best angle of operation is analysed.
As per the review, it is clear that new polymer resins and reinforcement fibres of glass, carbon and aramid (Kevlar) are most effective performance enhanced materials.This work of wind turbineblade analysis shows best results for material Kevlarfor total deformation and Epoxy Carbon for equivalent (Von-Mises) shear stresses also Carbon Fibre Reinforced Plastic for Maximum Shear Stress(Pa)
azimuth. The variation of the angle of attack along the blade span differs to that observed for the straight-bladed turbine, however, as the curvature of the blades results in a reduced radius, and, consequently, close to the blade tip, in a reduced circumferential component of velocity relative to the free stream. The amplitude of the oscillation of the local angle of attack close to the tip is thus significantly greater than that at the mid-span of the blade. Indeed, figure 5(a) shows that, near the tip of the blade, the angle of attack increases periodically beyond the static stall angle for the NACA 0015 airfoil. This indicates that the region near to the tips of the blades of the curved-bladed turbine configuration is subject to dynamic stall, even at moderate tip speed ratios. Figure 5 illustrates that the blades of this turbine are also subject to large, transient perturbations to the angle of attack, and thus to the blade loading, close to the tip of the blade when the blades pass through the wake that is produced by the turbine. These perturbations have a similar origin to those shown in figure 4 for the straight-bladed turbine but are confined to the most outboard elements of the blade.
In the following sections, a modified disk impeller ABT  is presented, which is derived from the same basic contour of the standard Rushton turbine (RuT) as well as other modifications; such as split blade disk impeller, twisted blade impeller (TBT)  and  or double disk impeller . The asymmetrically folded bladeturbine (ABT) impeller was developed and patented at the Laboratory for Fluid Dynamics and Thermo-dynamics specifically for dispersing large quantities of air, which (in contrast with the other two developed and gradually improved impellers (the TBT and the split bladeturbine) demonstrates air dispersion with the least energy dissipation, a high gas holdup, slight power drawn by aeration, and flooding at much higher gas flow rates than any other impellers. Computational fluid dynamics (CFD) is a very useful tool to analyse transitional phenomenon in space-time domain, which mixing time represents. In that manner, CFD was performed by liquid mixing for the same geometric configuration as the experimental setup. It enabled the visualization of the flow field of different impellers as well as the spreading of poured
Abstract: India is a country of large population. As the population increases the demand for electricity is also increases. This demand of electricity is fulfilled by power plant. This power plant runs on the coal. This power plant produces the greenhouse gas. And this will affect the environment. Solution to this problem is renewable energy. In renewable energy wind is available free of cost. Wind is the problem of supply side management. Wind is the indirect form of solar energy. There are three methods of analysis (1) CFD analysis (2) analytical (3) experimentation. CFD analysis is the low cost method. There are mainly two types of turbine horizontal axis wind turbine and vertical axis wind turbine. Betz limit show that horizontal axis wind turbine produce more power than vertical axis wind turbine. If we carry out CFD analysis of wind turbineblade then it would be easy to determine different factors affecting the wind turbineblade while air is passing over it. From that we can find the value of C l and C d and determine the forces acting on blade. From
While presenting our work titled “CFD ANALYSIS OF A THERMAL BARRIER COATED TURBINEBLADE”, we would like to express our sincere gratitude to Mr. MZ SIDDIQUE, Director, GTRE, Bangalore, an esteemed and prestigious Establishment of the Defence Research and Development Organization, for his kind permission to carry out this project work by utilizing the technical facilities of the GTRE. We are grateful to Jain University, for providing us with excellent facilities in the college during our course. We owe a debt of gratitude to Ms.VIMALA NARAYANAN, Scientist ‘G’, CFD Division, GTRE, Bangalore, for effectively guiding and supervising us through this project endeavour by imparting her prudent knowledge and personalized guidance coupled with sincere efforts. We are also thankful to the Head of Dept. & Prof. Dr. MANOJ VEETIL, IIAEM, Jain University, Bangalore, for his guidance and encouragement throughout the project duration for successful completion of the project. Finally, we would like to thank Prof. Dr. P.A. ASWATHA NARAYANA for motivating us to extend our work for publication, which inspired us to come this far.
shown velocity vector field below of the lower surface of the blade skin. Observations are reveal that, these values are much lower than the those corresponding to upper skin of the surface. Thus, by Bernulli’s principle, pressure is below skin is greater than the pressure above skin thereby leading lifting the airfoil (blade) [15-17].
Rib turbulated are commonly worn technique to develop the temperature transfer in the internal twisting cooling ways. The rib turbulence supporters are usually kept on two opposed walls of the cooling passageway. Heat passes from the surface of pressure and suction all the way through the blade walls and is again transformed to the cool turbine which is passing within the blade. The temperature transfer feat of the ribbed canal depends on the rib configurations, channel aspect ratio, and the Reynolds number of coolant flow. Many basic studies had been investigated and to identify the cool flow through a static ribbed canal.