基于动网格技术的垂直发射燃气流效应自排导仿真  

Simulation of vertical launching gas flow self-drainage based on dynamic grid technology

作　　者：肖金石 余德磊 张帆 XIAO Jinshi;YU Delei;ZHANG Fan(College of Weaponry Engineering,Naval Univ.of Engineering,Wuhan 430033,China;Unit No.91428,Ningbo 315400,China)

机构地区：[1]海军工程大学兵器工程学院,武汉430033 [2]91428部队,浙江宁波315400

出　　处：《海军工程大学学报》2024年第5期15-20,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(62073334)。

摘　　要：为了研究垂直发射燃气流自排导装置结构的排导特性,建立了垂直发射自排导装置实体与三维湍流模型,设计了燃气流排导数值仿真流程,用正四面体动网格更新方法实现了燃气流自排导“非定常”精细化数值仿真。该方法的变量残差值均较快收敛(<10^(-3)),满足工程数值计算要求。研究发现:燃气流对筒底压力瞬时温度近3000 K、冲击达2.5 MPa,内外筒间隙对排导效率有直接影响,导流锥形状对燃气流折返效率的影响不规则,但0.2 s后随收缩角增大而增强。这些排导特性为垂直发射燃气流自排导优化研究提供了参考借鉴。Aiming at the structural optimization design of the vertical launching self-drainage device,a physical and three-dimensional turbulence model of such a device was established,and the numerical simulation flow of the gas flow was constructed.The tetrahedral dynamic grid updating method was adopted to realize the fine numerical simulation of the whole process of the"unsteady"self-drainage of the gas flow.The variable residuals of that method converge quickly(<10^(-3))and meet the requirements of engineering numerical calculation.The study shows that the instantaneous temperature of the gas flow pressure on the bottom of the cylinder is nearly 3000 K,the impact reaches 2.5 MPa,the gas flow has a direct influence on the drainage efficiency,and that the influence of the inner and outer cylinder gap on the gas flow return efficiency is irregular,but the equal drainage characteristics are enhanced with the increase of the contraction angle after 0.2 seconds.The results may serve as a refe-rence for the structural optimization of the gas flow guide device.

关 键 词：垂直发射 动网格技术 燃气射流 自排导 

分 类 号：V553[航空宇航科学与技术—人机与环境工程]