对转压气机三维掠动叶优化设计

Three Dimensional Swept Rotor Blade Optimization Design for a Counter-Rotating Compressor

关键词:  压气机  对转技术  三维掠动叶  优化设计  二次流  流动损失  压气机效率 

Key words:  Compressor  Counter-rotating technique  3D swept rotor blade  Optimization design  Secondary flow  Flow loss  Compressor efficiency

摘要:

为探索三维掠动叶降低对转压气机二次流损失的潜力,进一步提高对转压气机气动性能,基于近似函数与遗传算法,针对某对转压气机双排转子在整机环境下进行三维掠动叶优化设计,并对优化前后流场进行对比分析。优化成功的得到了双排“S”形掠动叶,结果表明:三维掠动叶有效改善了双排动叶吸力面径向二次流,减小了吸力面低速区,提高了对转压气机性能,优化工况点整机效率提高0.6%,全工况范围内效率均有所提高；三维掠动叶提高对转压气机效率的根本原因是其对径向负荷分配的重新调整,将叶展下方流动较差区域负荷移至叶展上方,改善流场的同时保证对转压气机负荷不变。 

Abstract:

Based on function approximation and genetic algorithm,three dimensional swept rotor blade optimization design was conducted on the rotors of a counter-rotating compressor. The purpose of the paper is to explore the potential of reducing the secondary flow losses and hence to improve the overall performance of the counter-rotating compressor. Two rows of swept rotor blades with the shape of S were obtained from the optimization process, and then numerical simulation was carried out to identify the effectiveness of the optimization. The results demonstrate that three dimensional swept rotor blades effectively reduce both the radial secondary flows and low velocity areas around the suction side of the two rows of swept rotor blades. Furthermore, the efficiency of the counter-rotating compressor is increased by 0.6% at the optimization point, and it is also increased at all the other operating points. The reasons accounting for the efficiency improvement lie in that three dimensional swept rotor blades create a redistribution of the radial blade loadings by transferring the blade loadings from the bottom region with high losses to the top region, and in this way the flow field is improved while maintaining the blade loadings constant. 