摘要
为了研究发射筒毁伤位置对燃气弹射的影响机理,基于流体力学软件Fluent,采用RNG k-ε湍流模型,有限速率/涡耗散模型和动态分层动网格技术,建立筒壁破损状态下的燃气弹射内流场模型。在验证数值模型可靠性的基础上,改变破损位置距筒底距离,仿真得到不同破损位置下的流场分布与内弹道曲线。结果表明:从流场分布来看,破损改变了筒内燃气流动形成涡的数量与大小,破损下方处于正在燃烧的高温区,上方处于还未完全燃烧的低温区;距离筒底600 mm前后流场变化明显,破损分布600 mm之后为危险位置。从内弹道角度分析,破损位置在距离筒底600 mm以内时,压力初峰峰值下降36%;当破损位置距离筒底大于800 mm时,压力初峰峰值下降55%。破损缺口使出筒速度减小20%以上,对内弹道产生不利的影响。
In order to study the influence of damaged position on the launch tube on the gas ejection,the RNG k-εturbulence model, the finite-rate/eddy-dissipation model and the dynamic layered dynamic grid technology were used to establish the internal flow field of gas ejection under condition of damaged tube wall based on Fluent software.On the basis of verifying the reliability of the numerical model,the distance between the damaged position to the bottom of tube was changed and flow field distribution and internal ballistic curves under different damaged positions were obtained by simulation method.The results show that from the perspective of flow field distribution,the damaged position can change the number and size of vortices formed by gas flow.Below the damage position is in the high temperature zone of combustion,above the damage position is in low temperature zone of incomplete combustion.The flow field changes obviously about 600 mm away from the bottom of the tube,and the damaged position is dangerous after 600 mm.From the perspective of internal ballistic,when the da-maged position is less than 600 mm away from the bottom of the tube,the initial pressure peak decreases by 36%;when the damaged position is more than 800 mm away from the bottom of the tube,the initial pressure peak decreases by 55%.The damaged gap reduces the launching velocity by more than 20%,which has an adverse effect on the internal ballistic performance.
作者
王磊
郭保全
朱家萱
黄通
高钦和
WANG Lei;GUO Baoquan;ZHU Jiaxuan;HUANG Tong;GAO Qinhe(College of Mechatronics Engineering,North University of China,Taiyuan 030051,Shanxi,China;Research Institute of Intelligent Weapons,North University of China,Taiyuan 030051,Shanxi,China;College of Missile Engineering,Rocket Force University of Engineering,Xi′an 710025,Shaanxi,China)
出处
《火炮发射与控制学报》
北大核心
2023年第5期46-52,60,共8页
Journal of Gun Launch & Control
关键词
燃气弹射
二次燃烧
初容室
内流场
gas ejection
secondary combustion
initial chamber
internal flow field
