The number of blade effects on the performance of a mixed turbine rotor
Keywords:mixed flow turbine, performance, efficiency, finite volume method, ANSYS-CFX
AbstractTurbochargers have become widely applied todiesel vehicle engines. The mixed flow turbinetype is suitable for systems where compact powersources are required with higher boost pressure.The sensitivity of the rotor to incidence effectsand tendency of the flow to separate have givenrise to considerations of the optimum number ofblades. This paper investigates the performanceof a mixed inflow turbine under steadyconditions with the effect of the blade number.This study deals with the determination of theperformance characteristics of a mixed flowturbine by solving numerically the 3D Reynoldsaveraged Navier-Stokes equations. The ANSYSICEMsoftware is used to build the geometry andgenerate the unstructured meshes while theANSYS-CFX code is used to simulate the flow inthe mixed flow turbine.The numerical method is also used to determineoptimum geometrical characteristics such as theoptimum number of blades. It has been found thatthe rotor with 14 blades exhibits betterperformance.
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