NUMERICAL SIMULATION OF COMBUSTION INSTABILITY OF REGENERATIVE LIQUID PROPELLANT GUNS
(0) At present the research work of regenerative liquid propellant guns (RLPGs) has gained great progress, such as ignition control, the design of regenerative spraying structure, interior ballistics optimization, liquid propellant research and so on. But almost all firings of RLPG show some degree of high-frequency pressure oscillations, which will cause backfire and ballistic stability and become the main problem in RLPG engineering research. In order to better understand the spray combustion process and the phenomenon of pressure oscillations, the multiphase multidimensional fluid-dynamics model is presented to research the interior ballistic properties by considering mainly the multiphase reactive flow region between the piston and projectile based on modern spray combustion theory. A main difficulty in simulations is the modeling the annular jets breakup. A high-speed liquid sheet spray model is presented in this paper for the annular jets in RLPG based on the linear stability analysis and surface wave breakup theory. In addition to the jets atomization, the drops breakup (secondary breakup) is considered. The simulation code is carried out for the 37mm RLPG. The spray and combustion processes have been simulated and the pressure oscillations are generated which are in agreement with the experiment data well. The gas velocity and pressure distributions in the combustion chamber are gained. The spraying structures are shown in the paper and they account for the local accumulation of liquid propellant existed in the chamber which may be one of the inducements of pressure oscillation in RLPG. The simulation results indicate that the combustion instability associated with high-pressure liquid propellant system is dominated by interactions between physical and chemical mechanisms, such as acoustics, combustion, and inter-phase interactions.
LIU Ning ZHANG Xiang-yan
School of Mechanical engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
国际会议
25th International Symposium on Ballistics(第25届国际弹道会议)
北京
英文
58-66
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）