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5.2. UNSTEADY FLOW IN A RADIAL TURBINE 45 Figure 5.8. Computed shaft power vs. mass flow at inlet for Case 1 (left) and Case 3 (right), respectively. The flow field has only been investigated in detail for Case 1 and Case 3, since the conditions of Case 2 is not encountered in engines for passenger cars. The major difference between the flow fields in the volute for Case 1 and Case 2, is that Case 2 has higher velocity in the volute due to the phase shift between pressure and mass flow. The higher velocity in the volute for Case 2 implies that the inlet angle to the turbine wheel is different, which gives incidence losses, and hence, affects the shaft power in a negative way. Figure 5.9. Relative incidence angle to the wheel for 90◦ azimuthal angle during one pulse. Case 1 to the left, Case 3 to right. The incidence angle to the wheel varies during the pulse, due to the varying mass flow at the inlet. In Figure 5.9, the relative inlet angle for 90◦ azimuthal angle is plotted for Case 1 and Case 3. As can be seen, the inlet angle for Case 1 varies from approximately -85◦ to 60◦. For Case 3, the inlet angle varies from approximately -67◦ to -25◦, which is more favourable. For CasePDF Image | Numerical computations of the unsteady flow in a radial turbine
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