空气系统引气对压气机性能影响的数值研究

空气系统从高压压气机中引出的气流已达到主流流量的3%～5%,然而空气系统引气对压气机性能的影响研究较少.本文以低速单级压气机为研究对象,根据引气对压气机性能的影响机理设计了6种引气结构,并针对其中1种引气结构进行了5种不同引气量的研究.通过数值模拟,讨论了不同引气结构和引气量对压气机性能的影响.结果表明:对于角区大分离的静子,端壁引气可以较小的引气量获得压气机总压升和稳定工作裕度的全面提升.而且端壁的引气量并不是越大越好,存在最佳值.

NUMERICAL RESEARCH ON IMPACT OF AIR SYSTEM BLEEDING ON COMPRESSOR PERFORMANCE

Bled air from the high pressure compressor takes up 3%-5% in the air system. However, there are not many studies on the compressor performance after bleeding. By analyzing the low-speed single-stage compressors, six bleeding structures are presented according to their influence mechanism on the compressor performance, and five kinds of bleeding rate are applied to one of the structures. A numerical simulation is performed to study the influence of bleeding rates and structures on the compressor performance. The results show that for the stators with the large flow separation in the corner, bleeding a small amount of air from the end-wall region can improve the total pressure increase and the stability margin. Moreover there is an optimum value of the bleeding rate in the stator casing.