超声速环形引射器混合室皮托压力测量实验  

Pitot Pressure Measurements for a Supersonic Annular Ejector with Conical Mixing Chamber

作　　者：李智严 徐万武[1] 叶伟[1] 梁涛 张赛强 Li Zhiyan;Xu Wanwu;Ye Wei;Liang Tao;Zhang Saiqiang(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,湖南长沙410073

出　　处：《气动研究与试验》2024年第5期14-21,共8页Aerodynamic Research & Experiment

摘　　要：皮托压力可以直接反映出超声速引射器混合室内的流场特性,但受结构限制,在锥形混合室内沿流向连续测量皮托压力具有一定困难。本文提出一种适用于锥形混合室的皮托压力测量装置,能够在同一工况下获得锥形混合室不同截面上高空间分辨率的皮托压力。为验证测量装置及方法的有效性,对超声速环形引射器锥形混合室的皮托压力展开测量实验。结果表明,皮托压力的径向最小空间分辨率达到1mm,可从皮托压力剖线上清晰地分辨出边界层、一次流区域、二次流区域及混合层。同时发现,在一定的流向距离内,基于皮托压力的混合层厚度随流向距离近似呈线性增长,且归一化的混合层厚度增长率与前人报道的实验结果吻合较好,进一步验证了测量方法的可靠性。The pitot pressure can directly reflect the flow characteristics of the supersonic ejector,but measuring it along a conical mixing chamber is challenging due to the conical structure.A pitot pressure measuring device was provided,which continuously moved along flow and radial directions of the conical mixing chamber.This device allowed for obtaining high spatial resolution pitot pressure on different flow cross-sections.To validate the effectiveness of the measuring device,experiments were conducted on the conical mixing chamber of the supersonic annular ejector.The measured pitot pressure had a minimum radial spatial resolution of 1mm,and the pitot pressure profiles clearly revealed the boundary layer,the mixing layer,the primary and secondary flow fields.Results also showed that the mixing layer thickness based on pitot pressure increases linearly with the flow distance within a certain flow distance;and the normalized growth rate of the mixing layer was in good agreement with the experimental results reported earlier,which furtherly verified the reliability of the measurement method.

关 键 词：超声速引射器 环形引射器 皮托压力 混合层 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]