Numerical Study of Underwater Supersonic Gas Jets for Solid Rocket Engine

WANG Lili;LIU Ying;LI Daqin;WU Qin;WANG Guoyu

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  • Sponsored by: China Association for Science and Technology (CAST)

    Editor-In-Chief: Xu Yida

    ISSN 1000-1093

    　

  • Hosted By: China Ordnance Society

    Published By: Acta Armamentarii

    CN 11-2176/TJ

Acta Armamentarii, a Chinese monthly journal, was first published in 1979. The journal is supervised by China Association for Science and Technology, sponsored by China Ordnance Society，and edited and published by Editorial Board of Acta Armamentarii. The Journal is included in all important domestic databases，and also collected by Engineering Index (EI, USA), Chemical Abstracts (CA, USA), Science Abstracts (SA, UK）, Abstract Journal (AJ, Russia), and Current Bibliography on Science and Technology(CBST).Acta Armamentarii has been selected into the journal Of Ordnance Science and Technology (Weapons Industry) Field Of High Quality Scientific and Technological Periodical Classification Catalogue (2022 edition), ranking T1, and the journal of Automotive Engineering Field of High Quality Scientific and technological Periodical classification Catalogue, ranking T2.
Acta Armamentarii ›› 2019, Vol. 40 ›› Issue (6) : 1161-1170. DOI: 10.3969/j.issn.1000-1093.2019.06.006
Paper

Numerical Study of Underwater Supersonic Gas Jets for Solid Rocket Engine

  • WANG Lili，LIU Ying，LI Daqin，WU Qin，WANG Guoyu
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Abstract

The ignition process of gas jets under water is essentially complex, including multiphase flow and complicated flow structures. The Laval nozzle models with expansion ratios of 3.4 and 14.0 are numerically simulated. The CFD method is applied to study the flow structures and corresponding thrust characteristics of rocket engine and analyze the interaction between the high-speed gas jets and water environment. The results show that the flow structures and thrust characteristics of engine change periodically, and the process can be divided into three stages: necking, bulge and return stroke. The interaction between the water environment and the gas jet is the immediate cause leading to the back pressure oscillation, which also induces the fluctuation of shock waves, momentum thrust and pressure differential thrust. For the nozzles with different expansion ratios, the periodic variation of jets pattern and flow structures for the nozzle with expansion ratio of 14 can be more obviously observed, and the oscillation frequency of back pressure for the nozzle with expansion ratio of 3.4 is higher, accompanied with weak periodic characteristics and more stable thrust characteristics. Key

Key words

solidrocketengine / multiphaseflow / supersonicjet / computationalfluiddynamics

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WANG Lili，LIU Ying，LI Daqin，WU Qin，WANG Guoyu. Numerical Study of Underwater Supersonic Gas Jets for Solid Rocket Engine. Acta Armamentarii. 2019, 40(6): 1161-1170 https://doi.org/10.3969/j.issn.1000-1093.2019.06.006

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第40卷第6期
2019年6月兵工学报ACTA
ARMAMENTARIIVol.40No.6Jun.2019

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