级环境下附面层抽吸对对转压气机性能的影响

为研究级环境下附面层抽吸(BLS)对对转压气机性能影响的机理,针对某双排轴流对转压气机转子进行附面层抽吸的探索.在前排转子R1(Rotor 1)、后排转子R2(Rotor 2)吸力面沿弦向不同位置分别开设3个不同抽吸槽,研究了不同吸气位置与吸气量下R1单独吸气、R2单独吸气对对转压气机流场结构及性能的影响.结果表明:R1单独吸气时,随吸气量增加,R1效率提高,R2效率降低,对转压气机整机效率先增大后减小,最佳吸气位置靠近R1尾缘;R2单独吸气时,随吸气量增加,R1效率基本不变,R2效率先增大后减小,对转压气机整机效率先增大后减小,最佳吸气位置靠近R2尾缘;附面层抽吸后落后角明显减小,叶排间的气流参数匹配是级环境下附面层抽吸需要考虑的重要因素. 

Effects of boundary layer suction on counter-rotating compressor in multistage environment

In order to study the effects of boundary layer suction (BLS) on counter-rotating compressors in multistage environment, numerical investigations were performed on the rotors of a dual stage counter-rotating compressor with BLS method. Three different suction slots in chord direction were set up on the front rotor (R1) and rear rotor (R2) suction surface to study the effects of flow structure and performance on different suction ways, and independent suctions were carried out on R1 and R2 respectively at different suction locations and suction air rate in counter-rotating compressor. By BLS of individual R1, the efficiency increases with the rise of suction air rate. But the aerodynamic performance matching R1 with R2 becomes worse and makes R2 fall directly. The overall efficiency is also represented by the fluctuation from going up to down. The best suction location of R1 is near the trailing edge. By BLS of R2 individually, the efficiency of R2 keeps the trend from increase to reduction with the rise of suction rate, while the efficiency and flow field of R1 remain unchanged nearly. The best suction location of R2 is near the trailing edge. The deviation angles reduce obviously after the BLS. The above results demonstrate that matching of aerodynamic parameters between blades rows is a main factor to be considered after BLS in multistage environment.