水下弹射筒口气泡及载荷特性数值研究  

Numerical study on characteristics of outlet gas bubbleand load of underwater ejection launch

作　　者：杨珺凡 傅德彬[1] 毕凤阳 卫超 YANG Junfan;FU Debin;BI Fengyang;WEI Chao(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;The 713 Research Institute of CSIC,Zhengzhou 450015,China;Hennan Key Laboratory of Underwater Intelligent Equipment,Zhengzhou 450015,China)

机构地区：[1]北京理工大学宇航学院,北京100081 [2]中国船舶重工集团公司第七一三研究所,郑州450015 [3]河南省水下智能装备重点实验室,郑州450015

出　　处：《固体火箭技术》2021年第3期414-419,共6页Journal of Solid Rocket Technology

基　　金：装备预研领域基金(61402070104)。

摘　　要：水下弹射是水下运载器发射的重要方式,弹射工质气体形成的筒口气泡对相邻设备安全有着重要影响。为明确国内外广泛关注的一筒多弹水下弹射筒口气泡演变过程及载荷特性,利用雷诺平均的计算流体力学方法和嵌套动网格技术,建立水下弹射两相流动非定常数值计算模型,并经实验测量数据校验后,对一筒三弹水下弹射流动和载荷状态进行数值研究。研究结果表明:水下弹射工质气体在弹体离筒瞬间产生显著的瞬态冲击,此后弹射工质气体形成筒口气泡经历膨胀发展、界面缩聚断裂、筒口滞留气泡受压收缩等状态,并伴随膨胀收缩过程对周围设备产生交变载荷冲击,载荷变化幅值超过弹体离筒时的筒内外压差值。在一筒三弹发射号位相邻水密膜位置,最小压强可降至环境压强的0.7倍,最大压强可升高至环境压强的1.5倍,是设备抗冲抗震设计需要关注的重要内容。The gas bubble and loads near the launch canister outlet are important for the safety of structures during underwater ejection launching.In order to clarify the bubble evolution process and load characteristics of a barrel of missile underwater ejection which is widely concerned at home and abroad.The computational fluid dynamics(CFD)of the Reynolds average Navier-Stokes(RANS)method and dynamic mesh method are employed to establish numerical model of unsteady two-phase flow,and simulate the underwater ejection flow field of triple-launch system after data verification by experimental measurement.The results show that working fluid gas of underwater ejection has significant impact on the outlet in the separation of missile and canister.After that,the bubble formed by the missile working gas at the nozzle experienced expansion development,interfacial condensation fracture,and compression contraction of the trapped bubble at the nozzle,and accompanied by the expansion and contraction process,alternating load impact is generated on the surrounding equipment,and the load variation amplitude exceeded the pressure difference between internal and external the canister when the projectile body is removed from the canister.The minimum pressure can be reduced to 0.7 times of the environmental pressure and the maximum pressure can be increased to 1.5 times of the environmental pressure at the water tight film position adjacent to the launching position of triple-launch system.It is an important part of anti-shock design of equipment.

关 键 词：水下弹射 两相流 计算流体力学 动网格 

分 类 号：TJ762.4[兵器科学与技术—武器系统与运用工程]