Numerical Study of Underwater Supersonic Gas Jets for Solid Rocket Engine

被引：0

作者：

Wang L. ^{[1
]}

Liu Y. ^{[1
]}

Li D. ^{[1
]}

Wu Q. ^{[1
]}

Wang G. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Beijing Institute of Technology, Beijing

来源：

Binggong Xuebao/Acta Armamentarii | 2019年 / 40卷 / 06期

关键词：

Computational fluid dynamics; Multiphase flow; Solid rocket engine; Supersonic jet;

D O I：

10.3969/j.issn.1000-1093.2019.06.006

中图分类号：

学科分类号：

摘要：

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. © 2019, Editorial Board of Acta Armamentarii. All right reserved.

引用

页码：1161 / 1170

页数：9

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