Experimental characteristics of oblique shock train upstream propagation

作     者：Wang Chengpeng Xue Longsheng Tian Xuang 

作者机构：College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2017年第30卷第2期

页      面：663-676页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Nos.51476076 and 10702029) 

主　　题：Boundary layer separation Compressible flow Shock train Oscillating flow Wind tunnel testing 

摘      要：The structure and dynamics of an oblique shock train in a duct model are investigated experimentally in a hypersonic wind *** of the pressure distribution in front of and across the oblique shock train have been taken and the dynamics of upstream propagation of the oblique shock train have been analyzed from the synchronized schlieren imaging with the dynamic pressure *** formation and propagation of the oblique shock train are initiated by the throttling device at the downstream end of the duct *** reflected shocks,expansion fans and separated flow bubbles exist in the unthrottled flow,causing three adversepressure-gradient phases and three favorable-pressure-gradient phases upstream the oblique shock *** leading edge of the oblique shock train propagates upstream,and translates to be asymmetric with the increase of *** upstream propagation rate of the oblique shock train increases rapidly when the leading edge of the oblique shock train encounters the separation bubble near the shock reflection point and the adverse-pressure-gradient phase,while the oblique shock train slow movement when the leading edge of the oblique shock train is in the favorablepressure-gradient phase for unthrottled *** asymmetric flow pattern and oscillatory nature of the oblique shock train are observed throughout the whole upstream propagation process.