不同节流比下的超声速叶栅波系振荡模式及特性  

Oscillation Modes and Characteristics of Shock Waves in Supersonic Cascade With Different Throttling Ratios

作　　者：王子傲 常军涛[1] WANG Zi-Ao;CHANG Jun-Tao(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程热物理学报》2020年第11期2695-2703,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51722601)。

摘　　要：本文以德国宇航局设计的SAV21超声速叶栅为研究对象。实验研究了不同节流比下的波系结构及振荡特征。结果表明:在小节流比下,由叶栅型面产生的膨胀波可以有效抑制激波串的振荡。在大节流比下,出现了四种振荡模式。模式1中,激波在压力面前缘往复振荡;模式2中,大幅度振荡与吸力面前缘小幅度振荡交替出现;模式3中,只存在大幅度振荡;模式4中,波系在上游通道中运动。下游压力波动的无规律性导致模式4的发生是随机的。The study was based on the SAV21 supersonic cascade designed by the German Aerospace Centre.The shock wave structure and oscillation characteristics under different conditions of throttling ratios was experimentally studied.The results show that the expansion waves generated on the curved configuration of cascade can effectively suppress the oscillation of shock train.Under the condition of large throttling ratio,four oscillation modes appear.In the oscillation mode 1,the shock wave moves back and forth upstream of the pressure surface tip.In the oscillation mode 2,small-amplitude oscillations around the tip of suction surface and the large-amplitude oscillations appear alternately.In the oscillation mode 3,only the large-amplitude oscillations exist.In the oscillation mode 4,the shock wave propagates into the upstream passage.T he irregular fluctuation of downstream pressure leads to the random occurrence of the oscillation mode 4.

关 键 词：超声速叶栅 激波串 振荡流动 

分 类 号：V211.753[航空宇航科学与技术—航空宇航推进理论与工程]