中国物理B ›› 2019, Vol. 28 ›› Issue (6): 64704-064704.doi: 10.1088/1674-1056/28/6/064704

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Studies of flow field characteristics during the impact of a gaseous jet on liquid-water column

Jian Wang(王健), Wen-Jun Ruan(阮文俊), Hao Wang(王浩), Li-Li Zhang(张莉莉)   

  1. 1 School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
    2 Harbin Jian Cheng Bloc Limited Company, Harbin 150030, China
  • 收稿日期:2019-01-08 修回日期:2019-03-15 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Jian Wang E-mail:1805322964@qq.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 51305204).

Studies of flow field characteristics during the impact of a gaseous jet on liquid-water column

Jian Wang(王健)1, Wen-Jun Ruan(阮文俊)1, Hao Wang(王浩)1, Li-Li Zhang(张莉莉)2   

  1. 1 School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
    2 Harbin Jian Cheng Bloc Limited Company, Harbin 150030, China
  • Received:2019-01-08 Revised:2019-03-15 Online:2019-06-05 Published:2019-06-05
  • Contact: Jian Wang E-mail:1805322964@qq.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 51305204).

摘要:

Both experimental and numerical studies were presented on the flow field characteristics in the process of gaseous jet impinging on liquid-water column. The effects of the impinging process on the working performance of rocket engine were also analyzed. The experimental results showed that the liquid-water had better flame and smoke dissipation effect in the process of gaseous jet impinging on liquid-water column. However, the interaction between the gaseous jet and the liquid-water column resulted in two pressure oscillations with large amplitude appearing in the combustion chamber of the rocket engine with instantaneous pressure increased by 17.73% and 17.93%, respectively. To analyze the phenomena, a new computational method was proposed by coupling the governing equations of the MIXTURE model with the phase change equations of water and the combustion equation of propellant. Numerical simulations were carried out on the generation of gas, the accelerate gas flow, and the mutual interaction between gaseous jet and liquid-water column. Numerical simulations showed that a cavity would be formed in the liquid-water column when gaseous jet impinged on the liquid-water column. The development speed of the cavity increased obviously after each pressure oscillation. In the initial stage of impingement, the gaseous jet was blocked due to the inertia effect of high-density water, and a large amount of gas gathered in the area between the nozzle throat and the gas-liquid interface. The shock wave was formed in the nozzle expansion section. Under the dual action of the reverse pressure wave and the continuously ejected high-temperature gas upstream, the shock wave moved repeatedly in the nozzle expansion section, which led to the flow of gas in the combustion chamber being blocked, released, re-blocked, and re-released. This was also the main reason for the pressure oscillations in the combustion chamber.

关键词: gaseous jet, liquid-water column, pressure oscillations, shock wave

Abstract:

Both experimental and numerical studies were presented on the flow field characteristics in the process of gaseous jet impinging on liquid-water column. The effects of the impinging process on the working performance of rocket engine were also analyzed. The experimental results showed that the liquid-water had better flame and smoke dissipation effect in the process of gaseous jet impinging on liquid-water column. However, the interaction between the gaseous jet and the liquid-water column resulted in two pressure oscillations with large amplitude appearing in the combustion chamber of the rocket engine with instantaneous pressure increased by 17.73% and 17.93%, respectively. To analyze the phenomena, a new computational method was proposed by coupling the governing equations of the MIXTURE model with the phase change equations of water and the combustion equation of propellant. Numerical simulations were carried out on the generation of gas, the accelerate gas flow, and the mutual interaction between gaseous jet and liquid-water column. Numerical simulations showed that a cavity would be formed in the liquid-water column when gaseous jet impinged on the liquid-water column. The development speed of the cavity increased obviously after each pressure oscillation. In the initial stage of impingement, the gaseous jet was blocked due to the inertia effect of high-density water, and a large amount of gas gathered in the area between the nozzle throat and the gas-liquid interface. The shock wave was formed in the nozzle expansion section. Under the dual action of the reverse pressure wave and the continuously ejected high-temperature gas upstream, the shock wave moved repeatedly in the nozzle expansion section, which led to the flow of gas in the combustion chamber being blocked, released, re-blocked, and re-released. This was also the main reason for the pressure oscillations in the combustion chamber.

Key words: gaseous jet, liquid-water column, pressure oscillations, shock wave

中图分类号:  (Multiphase flows)

  • 47.61.Jd
47.60.Kz (Flows and jets through nozzles) 47.40.Nm (Shock wave interactions and shock effects) 47.27.wg (Turbulent jets)