摘要
空空导弹高空工作过程中,外部的超声速来流与其固体火箭发动机的尾部喷流相互作用,形成复杂的非定常尾部干扰流场,影响导弹后体的工作环境。为了探寻发动机内弹道对导弹后体结构的非定常影响,采用双组分气体的非定常CFD仿真模型对某空空导弹发动机工作期间的喷管内流场和导弹外流场进行一体化数值模拟,研究了由多个自由剪切层、激波、膨胀波等组成复杂干扰流场的结构,以及在发动机内弹道和外流速度的非定场效应影响下其变化过程,在此基础上定量分析了由此引起的尾流的温度和燃气的扩散,以及在不同内弹道阶段发动机对导弹后体结构产生的影响。计算结果表明,非定常干扰流场在导弹后体附近产生不断变化的低速涡流区域,加速了温度和燃气的扩散,致使导弹尾端面区域受到高温气体冲刷,进而降低导弹后体结构的安全性。因此,空空导弹的后体设计有必要考虑并减少发动机内弹道与导弹外流的非定场影响对导弹后体安全性所造成的潜在威胁。
In the high-altitude working period of missile,the interaction between the supersonic external flow and the tail jet flow of solid rocket motor derives complex unsteady interactive flow at the tail of missile,which affects the working environment of aft missile.In order to explore the unsteady influence of the internal ballistics on the structure of aft missile,an unsteady CFD simulation model of double component gas was adopted to simulate numerically the integration flow field including the inner flow of nozzle and the outer flow of missile during the working period of motor. The structure of interactive flow field composed of multiple free shear layers,shock waves and expansion waves,as well as its changing process under the unsteady effect of internal ballistic and outer flow velocity,were studied.Based on it,the resulting influences of temperature and gas diffusion caused by interactive flow field on differ-ent parts of aft missile during different periods of motor internal ballistic were analyzed quantitively.The results show that the chan-ging low-velocity vortex region generated by the unsteady interactive flow near the tail end of missile accelerates the temperature and gas diffusion of tail flow,erodes bottom region of aft missile in high temperature,and then lowers the working safety of aft missile structure.Therefore,it is necessary to consider it and decrease the working safety threats of unsteady influences caused by internal ballistic of solid rocket motor and missile outer flow in the design of aft part of air-to-air missile.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2014年第6期774-780,共7页
Journal of Solid Rocket Technology
关键词
空空导弹
固体发动机
内弹道
干扰流场
非定常CFD仿真
后弹体
air-to-air missile
solid rocket motor
internal ballistic
interactive flow
unsteady CFD simulation
aft missile
