孔式非定常脉动抽吸控制高负荷压气机叶栅内流动分离的参数研究

In order to explore the application prospects of unsteady pulsed suction (UPS) to control flow separations in a highly loaded compressor cascade and to understand the adaptability and flexibility of UPS under different excitation parameters, different excitation parameters of UPS such as excitation frequency, excitation location, pitch angle, and skew angle were first discussed and analyzed in detail. And then, based on the optimum excitation parameters, the result of UPS was compared with that of steady contant suction (SCS). The results show that excitation parameters play important roles in controlling flow separations. The aerodynamic performances of compressors can be significantly enhanced when all the excitation parameters are in their optimum ranges; if not, the control effect of flow separation will be weakened, which even results in an increase of the total pressure loss. When all the excitation parameters are their optimum values, total pressure loss is reduced by 19% only with the time-averaged suction flow rate [ms]=0.4%. Based on the optimum excitation parameters, UPS has more advantage in controlling flow separations and improving aerodynamic performances compared to SCS with the same time-averaged suction flow rate.