Numerical computations of the unsteady flow in a radial turbine

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Numerical computations of the unsteady flow in a radial turbine ( numerical-computations-unsteady-flow-a-radial-turbine )

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4.5. COMPARISON OF COMPUTED AND MEASURED DATA 35 the flow field in a medium sized mixed flow turbocharger turbine for a pulsating operating condition. The unsteady RANS computations with the Sliding Mesh technique were compared to experimental data and flow field measurements by Laser Doppler Velocimetry (LDV). They concluded that the agreement for both cycle averaged and instantaneous data was reasonable, but there remained some uncertainty over the used inlet conditions. Palfreyman et al. (2002) used the same code with a RNG k-ε turbulence model to compute the non-pulsatile flow field in a mixed flow turbine. They concluded that the computed flow field agreed well with measured LDV data at the turbine exit. The turbine efficiency also agrees well with measured efficiency over the test range. All this together show that the CFD code can be used to predict the per- formance of the turbine and that the code predicts the time resolved three- dimensional flow field in a reasonable way.

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