液体射流撞击液膜振荡行为的实验研究

doi:10.13675/j.cnki. tjjs. 013

推进技术 ›› 2019, Vol. 40 ›› Issue (12): 2752-2758.DOI: 10.13675/j.cnki. tjjs. 013

液体射流撞击液膜振荡行为的实验研究

刘昌国^1,2,3,施浙杭^2,3,陈锐达^2,3,李伟锋⁴,于达仁¹

1.哈尔滨工业大学能源学院,黑龙江哈尔滨 150001;2.上海空间推进研究所,上海 201112;3.上海空间发动机工程技术研究中心,上海 201112;4.华东理工大学资源与环境工程学院,上海;200237

发布日期:2021-08-15
作者简介:刘昌国，博士生，研究员，研究领域为空间液体火箭发动机技术。E-mail：liuchangguo@astropulsion.com

Experimental Study on Oscillation Behavior of Liquid Sheet from Impinging Jets

1.School of Energy,Harbin Institute of Technology,Harbin 150001,China;2.Shanghai Institute of Space Propulsion,Shanghai 201112,China;3.School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China

Published:2021-08-15

摘要/Abstract

摘要： 液体射流撞击过程是液体火箭发动机常见的高效雾化方式。为了进一步探究液体射流撞击雾化过程，采用高速摄像仪和图像处理技术对两股液体射流撞击液膜的振荡行为进行了实验研究, 考察了射流韦伯数（21≤We≤1356）和撞击角（2θ=60°，90°，120°）对液膜振荡的影响。结果表明，随着射流韦伯数增大（We>250），撞击液膜会从竖直稳定模式转变为振荡模式，促进液膜破裂和雾化。增大撞击角能加剧液膜振荡和增加雾化角。2θ=60°和90°的液膜振荡区间为250<We<400，2θ=120°的液膜振荡区间为We>250，无量纲振幅的时均极大值约为5。结果揭示了随着液体射流速度的增大，射流不稳定性的发展会引起撞击点的动量不平衡，进而形成液膜振荡。此外，液膜向下传播时与空气界面间的Kelvin-Helmholtz不稳定性也促进液膜振荡。

关键词: 液体火箭发动机;液膜;撞击流;雾化;振荡

Abstract: Impinging jets is a common method for efficient atomization of liquid rocket engines. To further elucidate the atomization process of liquid impinging jets, the oscillation behavior of liquid sheet formed by two impinging jets is experimentally studied by a high-speed camera and image processing method. Effects of the jet Weber number (21≤We≤1356) and impinging angle (2θ=60°, 90°, 120°) on the oscillation of liquid sheet are investigated. Results show that, as the jet Weber number increases (We>250), the liquid sheet transforms from a vertical stable pattern to an oscillation pattern, which promotes the breakup and atomization of the liquid sheet. An increase in the impinging angle can intensify the oscillation of liquid sheet and enlarge the atomizing angle. For 2θ=60° and 90°, the oscillation ranges of liquid sheet are 250<We<400, and for 2θ=120°, the oscillation range is We>250, and the time-averaged maximum value of normalized oscillation amplitude is about 5. Results reveal that as the liquid jet velocity increases, the development of jet instability causes the momentum imbalance of the impinging point, which consequently gives rise to the oscillation of liquid sheet. In addition, the Kelvin-Helmholtz instability between gas-liquid phases during the downstream propagation of liquid sheet also promotes the oscillation of the liquid sheet.

Key words: Liquid rocket engine;Liquid sheet;Impinging jets;Atomization;Oscillation

刘昌国,施浙杭,陈锐达,李伟锋,于达仁. 液体射流撞击液膜振荡行为的实验研究[J]. 推进技术, 2019, 40(12): 2752-2758.

LIU Chang-guo^1,2,3,SHI Zhe-hang^2,3,CHEN Rui-da^2,3,LI Wei-feng⁴,YU Da-ren¹. Experimental Study on Oscillation Behavior of Liquid Sheet from Impinging Jets[J]. Journal of Propulsion Technology, 2019, 40(12): 2752-2758.

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液体射流撞击液膜振荡行为的实验研究

Experimental Study on Oscillation Behavior of Liquid Sheet from Impinging Jets

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