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151 Table 5-6: Thermodynamic parameters for the three turbines. Parameter Symbol Inlet Stagnation Pressure [kPa] 𝑃01 Inlet Stagnation Temperature [K] 𝑇01 Mass Flow Rate [kg/s] 𝑀𝐹𝑅 Pressure Ratio [-] 𝑃𝑅 Rotational Speed [RPM] 𝑁 5.7.3 Off-Design Results 5.7.3.1 Parametric Study Turbine A 141.86 – 506.63 400 0.094 – 0.153 1.3 - 5 30,000 – 60,000 Turbine B 220 - 440 393.15 0.019 – 0.07 1-4 20,000 – 51,000 Turbine C 180 - 900 423.15 – 437.5 0.03 – 0.815 1.38 - 7 15,000 – 20,000 Similar to the design point, a parametric study has been performed in the performance prediction analysis prior to validating the model. This is very crucial in order to evaluate the effects of the empirical input parameters that are under the control of the designer. These input parameters are deviation angles, blockage factors, and rotor incidence angle. It is worth mentioning that the operating conditions for the parametric study are the same as the conditions mentioned in turbine A. Figure 5-15 presents the influence of the stator deviation angle on the MFR and efficiency of radial inflow turbines. The figure clearly shows that the turbine MFR is very sensitive to the stator deviation angle. As the angle increases from 0 to 2, the MFR decreases by 12%. Changing the deviation angle from 0 to -2, the MFR increases by 12%. The relationship between the MFR and the stator deviation angle is related to the definition of the MFR at the stator exit. The deviation angle is defined as the difference between the vane angle (setting angle) and the flow angle. As the flow angle moves towards the negative direction (the deviation moves towards the positive direction), the mass flow significantly decreases, and vice versa. Figure 5-15 also shows that the stator deviation has moderate impact on the turbine efficiency. As the deviation angles moves to the negative direction, the MachPDF Image | Automotive Radial Turbine Expander Design WHR
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