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Chin. Phys. B, 2019, Vol. 28(6): 064704    DOI: 10.1088/1674-1056/28/6/064704
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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 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
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.

Keywords:  gaseous jet      liquid-water column      pressure oscillations      shock wave  
Received:  08 January 2019      Revised:  15 March 2019      Published:  05 June 2019
PACS:  47.61.Jd (Multiphase flows)  
  47.60.Kz (Flows and jets through nozzles)  
  47.40.Nm (Shock wave interactions and shock effects)  
  47.27.wg (Turbulent jets)  
Fund: 

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

Corresponding Authors:  Jian Wang     E-mail:  1805322964@qq.com

Cite this article: 

Jian Wang(王健), Wen-Jun Ruan(阮文俊), Hao Wang(王浩), Li-Li Zhang(张莉莉) Studies of flow field characteristics during the impact of a gaseous jet on liquid-water column 2019 Chin. Phys. B 28 064704

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