Research on the Influence of Axisymmetric Endwall on EAT Performance

Han Teng, Wanyang Wu and Jingjun Zhong
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Han Teng: Liaoning Province Key Laboratory of Marine Small Gas Turbine Technology, Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Wanyang Wu: Merchant Marine College, Shanghai Maritime University, Shanghai 200120, China
Jingjun Zhong: Merchant Marine College, Shanghai Maritime University, Shanghai 200120, China

Energies, 2021, vol. 14, issue 8, 1-21

Abstract: To improve the performance of electrically assisted turbochargers (EATs), the influences of the hub profile and the casing profile on EAT performance were numerically studied by controlling the upper and lower endwall profiles. An artificial neural network and a genetic algorithm were used to optimize the endwall profile, considering the total pressure ratio and the isentropic efficiency at the peak efficiency point. Different performances of the prototype EAT and the optimized EAT under variable clearance sizes were discussed. The endwall profile affects an EAT by making the main flow structure in the endwall area decelerate and then accelerate due to the expansion and contraction of the meridional surface, which weakens the secondary leakage flow of the prototype EAT and changes the momentum ratio of the clearance leakage flow and the separation flow in the suction surface corner area. Because the tip region flow has a more significant influence on EAT performance, the optimal casing scheme has a better effect than the hub scheme. The optimization design can increase the isentropic efficiency of the maximum efficiency point by 1.5%, the total pressure ratio by 0.67%, the mass flow rate by 1.2%, and the general margin by 6.4%.

Keywords: axisymmetric endwall; electrically assisted turbocharger; axial compressor; optimization design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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