draft tube
The Influence of Draft-Tube Pressure Pulsations on the Cavitation-Vortex Dynamics in a Francis Turbine
... the draft-tube wall carries enough information for a prediction of the average image intensity and the structure of the cavitation vortex using radial basis neural ...
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CFD Simulation and Analysis of Conical Draft Tube of Experimental Setup of Hydraulic Turbine
... a draft tube significantly affects the efficiency of mixed and reaction flow turbine ...the draft tube is to recover the part of kinetic energy coming out of ...of draft tube to ...
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STABILITY ANALYSIS OF DRAFT TUBE SPOUTED BED USING PRESSURE FLUCTUATION ANALYSIS
... Stable operation of spouted bed is always advisable to achieve homogeneous solid circulation and thereby heat and mass transfer. In conventional spouted bed the stability generally refers a bubble and slug free bed with ...
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Hydrodynamics And Heat Transfer Characteristics Of Draft Tube Spouted Bed Roasting Of Groundnuts (Arachis Hypogeae)
... C and air temperature range of 150 to 250 o C for similar food grains. Table 3 and Figures 7 (a), (b) and (c) present the performance characteristics of the draft tube spouted bed roaster. It can be seen ...
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Numerical Prediction of Non-Cavitating and Cavitating Vortex Rope in a Francis Turbine Draft Tube
... the draft tube for LES is more refined than for the other two turbulent models, therefore it is difficult to say, whether the results are better because of the more advanced turbulent model or because of ...
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Multi-objective Optimization of Draft Tube in Francis Turbine Using DOE, RBF and NSGA-II
... the draft tube is generated by optimal Latin hypercube (OLH) method of the DOE technique, of which performances are evaluated through computational fluid dynamic (CFD) numerical ...the draft ...
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Correlation Dimension for Pressure Fluctuation in Hydraulic Turbine Draft Tube
... of draft tube, the correlation dimension analysis has been carried on using the time domain ...in draft tube are not same under different load, the corresponding fractal correlation dimensions ...
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Laboratory modeling of flow regimes in a draft tube of Francis hydro-turbine
... Abstract. The paper reports on some results of the experimental study of flow and pressure pulsations in a laboratory model of the draft tube (DT) of Francis-99 hydro-turbine over a broad range of operating ...
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Hydrodynamic Assessment of Increasing the Energy Efficiency of Trawler Propulsion with a Draft Tube
... a draft tube, or a diffuser, to recover energy that would otherwise be lost when ...A draft of tube the same length as the propellers diameter could mean fuel savings of 10%, a draft ...
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A Review on Study of Cavitations in Hydroulic Turbine
... radial design with low specific speed and it can operate in turbine or in pump mode. The rest of the machine components comprising the penstock, spiral casing, stay vanes, guide vanes, draft tube, shaft, ...
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Improvement of Efficiency Prediction for a Kaplan Turbine with Advanced Turbulence Models
... the draft tube obtained by four simulations (steady-state SST, transient SST, SAS and ZLES) is ...the draft tube had a very small influence on streamlines, therefore this picture is also ...
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Hydrodynamics of a Gas-Driven Gas-Liquid-Solid Spouted Bed
... a draft tube was present, these three velocities increased with increasing particle density and draft tube ...a draft tube, the gas- driven gas-liquid-solid spouted bed stability ...
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Experimental Determination of Cavitation Characteristics of Hydraulic Turbines
... v) Trailing edge cavitation detection technique: In this type of cavitation, cavities collapse in the draft tube therefore draft tube swirl detection techniques are also used for this ...
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Development of a Simulation Model for Fluidized Bed Mild Gasifier
... As shown in Fig. 5.20, some carbon solid particles are carried away by the syngas at the syngas exits on top of the gasifier. These particles will be collected through a cyclone unit outside the gasifier. In this case, ...
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Unsteady operation of the Francis turbine
... 8.13 Comparisons of the CFD solutions performed at three different time steps for an instantaneous step decrease in the draft tube flow Velocity is normalised with the 256 steady-state v[r] ...
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Using Numerical Flow Analysis to Predict the Efficiency of a Francis Turbine
... the draft- tube outlet with all the stay and guide vanes and the runner blades, ...the draft tube and avoid inaccurate boundary condi- tions between the turbine ...the draft-tube ...
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Part load operation in M.D hydro power plant unit two
... [7] Sebastian MUNTEAN , Romeo F. SUSAN-RESIGA , Viorel C. CÂMPIAN , Cosmin DUMBRAVĂ 4 , Adrian CUZMOŞ ,‖ In Situ unsteady pressure measurements on the draft tube cone of the Francis turbine with air ...
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Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection
... Abstract. Vortex rope, which induces substantial pressure pulsations, arises in the draft tube (diffuser) of Francis turbine for off-design operating conditions. Present paper focuses on mitigation of those ...
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Simulation of Transient Flow in Hydroelectric Power Plants Using Unsteady Friction
... To study the influence of surge tanks on the transient conditions, Fig. 7 shows the effect of surge tank in two cases: a) at the spiral case and b) at the draft tube. As shown in Fig. 7 the maximum and the ...
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Dynamic Analysis of Tube In Tube Tall Buildings
... including tube and tube-in-tube structures are idealized as a prismatic cantilever flexural-shear beam assuming the lower most elevation to be fully fixed and natural frequency expressions are ...
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