摘要
为使初容室缩短工况下弹射压力冲击得到有效平滑,采用RNGk-ε湍流模型、有限速率/涡耗散模型和动态分层动网格技术,建立了耦合导弹运动、二次燃烧和环形隔板障碍物的数值流动模型。在实验数据验证模型可靠性的基础上,分析了初容室缩短200mm及布置环形隔板后流场特性的变化,研究了在初容室缩短工况下,环形隔板平滑压力冲击的有效性。结果表明:初容室缩短200mm时,燃气反射点向筒轴线靠近,导流锥下部的回流区变小,燃气扩散进程提前;最下方隔板能有效延缓燃气向上扩散,第5个隔板对燃气有引流作用,隔板间的障碍腔有储存氧气的功能;布置高50mm的第5个隔板后,能使压力冲击得到有效平滑,此时导弹加速度峰值减小6.7%,出筒速度增加0.42%,出筒时间延迟2.85%。
In order to effectively smooth the ejection pressure impact under the condition of shortening the initial cavity,using turbulence model RNG k-ε,finite rate/eddy dissipation model and dynamic hierarchical dynamic mesh technology to establish flow numerical model of coupling missile movement,secondary combustion and circular baffle obstacle.Based on the reliability of experimental data validation model,the change of flow field characteristics after initial chamber shortening 200 mm and the arrangement of annular baffle was analyzed,and the effectiveness of the smooth pressure shock of annular baffle under the condition of shortening the initial cavity was studied.The results show that when the initial cavity was shortened by 200 mm,the gas reflection point come close to the cylinder axis,and the recirculation zone beneath the deflection cone becomes smaller,and the gas diffusion process is advanced;the bottom baffle delays upward diffusion of gas effectively,and the fifth baffle has effect on gas drainage,and the obstacle cavity between baffles can store oxygen;after arranging the fifth baffle with 50 mm height,pressure shock can be effectively smoothed.At this time,the acceleration peak of missile is decreased by 6.7%,the velocity out of tube is increases by 0.42% and the time out of tube is delayed by 2.85%.
作者
程洪杰
陈力
赵媛
邵亚军
CHENG Hongjie;CHEN Li;ZHAO Yuan;SHAO Yajun(Laboratory of Armament Launch Theory and Technology,Army Key Discipline,Rocket Force University of Engineering,Xi'an 710025,China)
出处
《弹箭与制导学报》
CSCD
北大核心
2018年第1期1-6,10,共7页
Journal of Projectiles,Rockets,Missiles and Guidance
基金
国家自然科学基金(51475462)资助
关键词
燃气弹射
初容室
压力冲击
环形隔板
平滑效果
内弹道
gas ejection
initial chamber
pressure shock
circular baffle
smooth effect
interior ballistic
