Research on the Effect of Pressure Side Winglet Profile on the Performance of High-Loaded Compressor Rotor

Abstract

To improve the performance of an electric assistant turbocharger in different backpressure environments, the compressor margin needed to be optimized individually. As an effective passive control method to improve the margin, the full-chord-covered pressure side tip winglet has been studied and applied for compressor and turbine rotors. The research on the effect of partial tip winglets, which can reduce added mass of winglet and the weight of the rotor, on the compressor margin has not been found in the available literature. Utilizing numerical simulation, this paper was focused on the research of a high-speed single-rotor compressor which the tip loading coefficient is 0.81. The shape of the pressure side tip winglet is optimized with the margin as the single objective. A database with 189 valid samples was generated using the Latin hypercube method. A self-developed ε-Support vector regression (SVR)-genetic algorithm (GA) optimization platform was applied to optimize the tip shape. The platform obtained a partial pressure side tip winglet shape. Compared with the CFD simulation results, the error of the ε-SVR-GA platform predicted the margin was 4.1%. The result obtained by the ε-SVR-GA platform was improved compared with the prototype margin by 25.36%.