基于丝线流动显示技术的内转进气道起动性能实验  

Experiment on the Starting Characteristics of an Inward-Turning Inlet Based on Silk-Thread Flow Visualization Method

作　　者：余安远 曲俐鹏[1,2] 刘建霞 杨大伟 李姝源[1] 乐嘉陵 YU An-yuan;QU Li-peng;LIU Jian-xia;YANG Da-wei;LI Shu-yuan;LE Jia-ling(Aerospace Technology Institute of CARDC,Mianyang 621000,China;Science and Technology on Scramjet Laboratory of CARDC,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心空天技术研究所,四川绵阳621000 [2]中国空气动力研究与发展中心高超声速冲压发动机重点实验室绵阳分部,四川绵阳621000

出　　处：《气体物理》2023年第2期32-43,共12页Physics of Gases

基　　金：1912项目子项2019-JCJQ-DA-001-057项目。

摘　　要：采用丝线法流动显示技术,在高超声速冷流暂冲式下吹风洞开展了快速获取内转进气道起动性能的实验研究。实验在中国空气动力研究与发展中心(CARDC)Φ0.5 m高超声速风洞中进行,来流Mach数为5。实验模型为椭圆转圆形内转进气道,总收缩比为5.8,内部收缩比为1.7,喉部为直径50 mm的圆形截面。模型的肩部区域种植了长度与间隔可更换的丝线,为了改善进气道的起动性能,模型进气道的内压缩段开设了可以动态堵塞的泄流孔,在喉道下游设置了可动态节流的节流锥。实验获得了丝线长度、相邻丝线间隔的推荐值,同时表明,丝线流动显示技术能够快速、准确、直观、方便地判断进气道的起动状态,并能定量给出流动分离起始位置与分离结构,所采用的丝线流动显示技术丰富了高超声速风洞实验的流场可视化方法库。研究还表明,采用丝线流动显示技术,所研究的内转进气道在Ma=5时处于双解区,实验给出了进气道重起动及退出不起动的一种可行方案。With some silk threads being planted on the shoulder of the inlet and the silk-thread flow visualization method being used,the starting characteristics of an inward-turning inlet were researched in hypersonic cold-flow blow-down wind tunnel experiments.The experiments were carried out in aΦ0.5 m hypersonic wind tunnel of China Aerodynamics Research and Development Center(CARDC).The Mach number of the experiments was 5.The inlet was an elliptical-to-circle cross-section transition inlet with a total contraction ratio of 5.8,an internal contraction ratio of 1.7 and a diameter of 50 mm at the throat round-section.The recommended length of the silk-thread and the recommended interval of the adjacent silk-thread,both of which influence the visualization effect of the silk-thread flow,were obtained through the experiments.The results show that the visualization method can quickly,accurately,intuitively,and convenintly judge the real-time starting state of the inward-turning inlet in the experiments,and can obtain the initial position of the separation and the flow structure of the separation zone when the inlet does not start.The results also show that the current inward-turning inlet has double states at Ma=5.A feasible way for the inlet to restart or quit unstarting was given.At the same time,the research shows that the current silk-thread visualization method enriches the flow visualization method library,especially for the starting characteristics research of the inward-turning inlet in wind tunnel experiments.

关 键 词：丝线流动显示方法 内转进气道 起动特性 高超声速风洞实验 

分 类 号：V211.48[航空宇航科学与技术—航空宇航推进理论与工程] V211.71