双级对转压气机多叶排全三维转子优化分析

Three-dimensional Rotor Optimization in Multi-blade Row of a Dual Stage Counter-rotating Compressor

以实验室的对转压气机实验台为研究对象,应用近似函数方法并结合遗传算法对其下游转子在整机环境下进行了优化设计。结果表明:优化后,在设计点,对转压气机效率提高了0.69%,流量、压比基本不变,喘振裕度有所提高;设计点优化后,下游转子效率提高了1.36%,压比基本不变;上游转子效率和压比都基本不变。同时,优化减小了下游转子中部、尖部的尾迹掺混损失,但增大了根部的尾迹掺混损失,使出口导流叶片流动有所改善。

Based on the detailed study of a counter-rotating compressor in the laboratory, three -dimensional optimization had been carried out in multi-blade row surrounding by approximate function methods combining with genetic algorithm. The second rotor had been optimized by this method to improve the performance of counter-rotating compressor. Compared with the initial compressor the results show that： at design point, the efficiency of the optimized counter-rotating compressor is increased by 0. 69%, the mass flow rate and pressure ratio remaines basically unchanged, however the surge margin is improved. The efficiency of the rotor downstream increases by 1.36%, its pressure ratio is almost invariant, at the same time the performance of the rotor upstream retain a higher level at design point. By further contrast the flow structure of the optimized and initial counter -rotating compressor, the optimization reduces the wake mixing losses at the middle and tip of the rotor downstream, but increases the wake mixing losses at the root, the optimization improves the flow structure of outlet guide vane as well.