Instability of a Transient Submerged Jet in Supersonic Nozzle During Its Start-Up and Shut-Down Process

Journal of Propulsion Technology ›› 2014, Vol. 35 ›› Issue (4): 523-529.

Previous Articles Next Articles

Instability of a Transient Submerged Jet in Supersonic Nozzle During Its Start-Up and Shut-Down Process

School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;Kunming Precision Mechinery Research Institute,Kunming 650118,China;School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Published:2021-08-15

水下超声速喷嘴起动/关机过程射流的动态不稳定性研究

何淼生¹,覃粒子¹,何佳磊²,张晓源¹,刘宇¹

北京航空航天大学宇航学院,北京 100191;北京航空航天大学宇航学院,北京 100191;昆明精密机械研究所,云南昆明 650118;北京航空航天大学宇航学院,北京 100191;北京航空航天大学宇航学院,北京 100191

作者简介:何淼生(1987—),男,博士,研究领域为喷管非定常流动。E-mail:hms@sa.buaa.edu.cn

Abstract

Abstract: The present paper describes an experiment study on the flow pattern and dynamic instability of a transient submerged jet in supersonic nozzle during its start-up and shut-down process. A high speed camera is utilized for the flow visualization. The experimental results indicate that a jetting flow regime is fast established when the submerged gas injection at a high speed, and the periodic fracture bubbles are absent in our experiment during initial start-up process. During the start-up process, the dynamic instability characteristics appear only at some low pressure ratios in over-expanded condition, while the frequency of jet necking/back-attack phenomena is up to 10Hz during the nozzle shut-down process, indicating that the submerged jet presents strongly unstable oscillation even at high pressure ratios. The different oscillation characteristics of start-up and shut-down phase indicates a certain relevance between the gas/water interaction process and jet stability. The inlet pressure increasing process may contribute to the suppression of the jet boundary necking, while the lowing process of inlet pressure appears an opposite effect, and the jet shows a higher instability. 

Key words: Nozzle; Submerged jet; Supersonic; Start-up; Shut-down; Instability

摘要： 为了研究水下超声速喷嘴出口燃气泡的发展及射流的动态不稳定机制,应用高速摄像的流场可视化方法,开展了水下欠膨胀超声速喷嘴起动和关机过程的冷流试验研究。试验结果表明:喷嘴起动初期高压气体喷出后很快建立起射流形态,没有出现间歇性断裂泡流形态；喷嘴起动阶段的射流动态不稳定特征仅出现在较低压比下的过膨胀状态,而关机阶段的超声速射流在较高压比下的欠膨胀状态即开始出现高度不稳定振荡,射流在欠膨胀到过膨胀的过渡阶段回击频率高达10Hz；起动与关机阶段动态不稳定性的差异与气/水之间相互作用过程有关,入口压力的持续升高有助于抑制射流边界的颈缩,而入口压力的降低过程则进一步加剧了水环境对射流边界的作用,射流表现出更高的不稳定性。 

关键词: 喷嘴;水下射流;超声速;起动;关机;不稳定性 

HE Miao-sheng¹, QIN Li-zi¹, HE Jia-lei², ZHANG Xiao-yuan¹, LIU Yu¹. Instability of a Transient Submerged Jet in Supersonic Nozzle During Its Start-Up and Shut-Down Process[J]. Journal of Propulsion Technology, 2014, 35(4): 523-529.

何淼生,覃粒子,何佳磊,张晓源,刘宇. 水下超声速喷嘴起动/关机过程射流的动态不稳定性研究[J]. 推进技术, 2014, 35(4): 523-529.

References

[1] Linck M, Gupta A K, Yu K.Submerged Combustion and Two-Phase Exhaust Jet Instabilities[J].Journal of Propulsion and Power, 2009,5(2):522-532.
[2] Tang J N, Wang N F, Shyy W.Flow Structures of Gaseous Jets Injected into Water for Underwater Propulsion[R].AIAA 2011-185.
[3] 戚隆溪, 曹勇, 王柏懿.水下欠膨胀高速气体射流的实验研究[J].力学学报, 2000,2(6):667-675.
[4] Hoefele E O, Brimacombe J K.Flow Regime in Submerged Gas Injection[J].Metallurgical Transactions B, 1979,0(4):631-648.
[5] Aoki T, Masuda S, Hatano A, et al.Characteristics of Submerged Gas Jets and a new Type Bottom Blowing Tuyere[M].Newcastle:University of Newcastle upon Tyne, 1982.
[6] Loth E, Faeth G M.Structure of Underexpanded Round Air Jets Submerged in Water[J].International Journal of Multiphase Flow, 1989,5(4):589-603.
[7] Surin V A, Evchenko V N, Rubin V M.Propagation of a Gas Jet in a Liquid[J].Journal of Engineering Physics, 1983,5:1091-1101.
[8] 施红辉, 王柏懿, 戚隆溪,等.水下超音速气体射流[C].北京:第19届全国水动力学研讨会文集,2005.
[9] 王柏懿, 戴振卿, 戚隆溪,等.水下超音速气体射流回击现象的实验研究[J].力学学报, 2007,9(2):267-272.
[10] Dai Zhenqing, Wang Baiyi, Qi Longxi, et al.Experimental Study on Hydrodynamic Behaviors of High-Speed Gas Jets in Still Water[J].Acta Mechanica Sinica, 2006,2(5):443-448.
[11] 戴振卿.水下超音速气体射流的实验研究[D].北京:中国科学院力学研究所, 2006.
[12] 王晓刚, 王超, 郭强,等.二维水下高速气体射流的振荡流流型研究[J].浙江理工大学学报, 2009,6(4):613-618.
[13] 施红辉, 郭强, 王超,等.水下超音速气体射流胀鼓和回击的关联性研究[J].力学学报, 2010,2(6):1206-1210.
[14] 王晓宏, 陈义良, 李潜,等.导弹水下发射时喷嘴的气体流动[J].推进技术, 2001,2(1):61-64.(WANG Xiao-hong, CHEN Yi-liang, LI Qian, et al.Nozzle Flows of the Missile Launching under Water[J].Journal of Propulsion Technology, 2001,2(1):61-64.)
[15] Xu Xiaoqiang, Deng Jian, Ren Anlu.The Research on High-Speed Gas Jet of Rocket Nozzle Underwater[J].Journal of Hydrodynamics, Ser.B.2005,7( 2):204-208.
[16] 曹嘉怡, 鲁传敬, 李杰,等.水下超音速燃气射流动力学特性研究[J].水动力学研究与进展,2009,4(5):575-582.
[17] 朱卫兵, 陈宏, 黄舜.水下高速射流气泡变化过程数值研究[J].推进技术, 2010,1(4):496-502.(ZHU Wei-bing, CHEN Hong, HUANG Shun.Numerical Study of the Process of the Evolution of Bubble of High-Speed Jet Underwater[J].Journal of Propulsion Technology, 2010,1(4):496-502.)
[18] Tang J N, Li S P, Wang N F, et al.Flow Structures of Gaseous Jet Injected into Liquid for Underwater Propulsion[R].AIAA 2010-6911.
[19] 王宝寿, 许展, 易淑群,等.水下推力矢量特性试验研究[J].船舶力学, 2000,4(5):9-15.
[20] 王聪, 王学孝, 徐世昌,等.潜射导弹运动特性的分析与测试[J].导弹与航天运载技术, 2002(2):1-4.
[21] 汤龙生, 刘宇, 吴智锋,等.水下超音速燃气射流气泡的生长及压力波传播特性实验研究[J].推进技术, 2011,2(3):417-420.(TANG Long-sheng, LIU Yu, WU Zhi-feng, et al.Experimental Study on Characteristics of Bubble Growth and pressure Wave Propagation by Supersonic Gas Jets Under Water[J].Journal of Propulsion Technology, 2011,2(3):417-420.)
[22] 姚琰, 鲁传敬, 朱坤.水下高速气体射流的实验研究[J].水动力学研究与进展,2009,4(5):590-595.
[23] Shi Honghui, Wang Baiyi, Dai Zhenqing.Research on the Mechanics of Underwater Supersonic Gas Jets[J].Science in China Series G:Physics , Mechanics & Astronomy, 2010,3(3):527-535.

Instability of a Transient Submerged Jet in Supersonic Nozzle During Its Start-Up and Shut-Down Process

水下超声速喷嘴起动/关机过程射流的动态不稳定性研究

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 0

Recommended Articles

Metrics

Comments