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%.
Highlights
As a new type of supercharger solution, the electrically assisted turbocharger (EAT) has shown potential in reducing engine emissions and improving maneuverability [1]
In the field of vehicle power, the 48-V onboard power system provides the basis for the large-scale installation of EATs [2]
In the field of fuel cells, the EAT is an important component for the miniaturization of fuel cells [3]
Summary
As a new type of supercharger solution, the electrically assisted turbocharger (EAT) has shown potential in reducing engine emissions and improving maneuverability [1]. In the marine power field, an EAT can be used as an alternative to the auxiliary blower to improve the efficiency of the power plant and reduce the load on the power grid. EATs mostly use the radial compressor impeller of the existing turbochargers. The research team proposed a design idea of an axial compressor for the EAT rotor, aiming at applications in large vehicle power plants and small ship power plants; that is to say, systems with a high mass flow rate, a low-pressure ratio, and direct connections with high-speed motors [4]
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