Numerical study on ignition start-up process of an underwater solid rocket motor across a wide depth range  

作　　者：Deyou WANG Shipeng LI Ge JIN Ruyao WANG Dian GUAN Ningfei WANG 

机构地区：[1]School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China [2]Beijing System Design Institute of Electro-mechanic Engineering,Beijing 100854,China

出　　处：《Chinese Journal of Aeronautics》2024年第10期136-157,共22页中国航空学报（英文版）

基　　金：supported by the National Level Project of China.

摘　　要：Solid rocket motors have important applications in the propulsion of trans-media vehicles and underwater launched rockets.In this paper,the ignition start-up process of an underwater solid rocket motor across a wide depth range has been numerically studied.A novel multi-domain integrated model has been developed by combining the solid propellant ignition and combustion model with the volume of fluid multiphase model.This integrated model enables the coupled simulation of the propellant combustion and gas flow inside the motor,along with the gas jet evolution in the external water environment.The detailed flow field developments in the combustion chamber,nozzle,and wake field are carefully analyzed.The variation rules of the internal ballistics and thrust performance are also obtained.The effects of environmental medium and operating depth on the ignition start-up process are systematically discussed.The results show that the influence of the operating environment on the internal ballistic characteristics is primarily reflected in the initial period after the nozzle closure opens.The development of the gas jet in water lags significantly compared with that in air.As the water depth increases,the ignition delay time of the motor is shortened,and the morphology evolution of the gas jet is significantly compressed and accelerated.Furthermore,the necking and bulging of the jet boundary near the nozzle outlet and the consequent shock oscillations are intensified,resulting in stronger fluctuations in the wake pressure field and motor thrust.

关 键 词：Underwater propulsion Solid rocket motor Ignition start-up process Underwater gas jet Thrust oscillation 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]