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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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5.2. UNSTEADY FLOW IN A RADIAL TURBINE 51 Figure 5.14. The secondary flow at the inlet plane for Case 3 and 5, respectively. uncertainty. Altogether, the computations show that different perturbations at the inlet do affect the performance of the turbine. As can be seen in Table 4, the isentropic efficiency does not reflect the fact that the shaft power is almost 20% lower for Case 5 as compared to Case 1. This is so since the isentropic efficiency also takes into account the energy content of the flow after the turbine, which can be used to drive a second turbo-charger. A better definition of the efficiency is the utility factor, κ. The utility factor is defined as: κ = PSHAFT (5.1) PINLET This better reflect the effects of the perturbation at the inlet. In this definition, PINLET is the available power at the inlet boundary, defined as: PINLET = 2 ·ui ·ui +h ρUndA (5.2) 􏰎􏰘1 􏰙 I nlet

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