坦克行驶扬尘浓度分布特性数值模拟研究

摘要

战场扬尘浓度分布对激光引信抗扬尘干扰研究具有重要意义.基于计算流体力学方法,应用重正化群k-ε模型和离散相模型,数值模拟单辆坦克行驶产生的扬尘分布规律.分析计算域内不同截面的扬尘浓度分布云图和平均浓度随时间的变化趋势,得到坦克不同行驶速度对扬尘浓度分布的影响规律.结果表明:坦克尾部扬尘浓度在近坦克尾部变化更迅速,而在远离坦克尾部区域扬尘浓度值动态范围更大;重力对扬尘扩散的影响可以忽略;坦克行驶速度越快,则扬尘扩散范围越大,且在垂直方向上扬尘浓度呈指数规律衰减.%The distribution of dust concentration in battlefield plays an important role in the study of antidust interference of laser fuze.Based on the computational fluid dynamics method,the RNG k-ε model and the discrete phase model are used to simulate the distribution rule of dust raised during tank moving.The dust distribution graphics and the changes of mean concentration with time on different cross sections in the computational domain are analyzed,and the influence rule of moving speeds of tank on the concentration distribution of raised dust is obtained.The results show that the dust concentration near tank tail changes more rapidly,while the dynamic range of dust concentration far away from the rear area of tank is larger.The influence of gravity on dust diffusion can be neglected,and the area of dust distribution is larger when the tank moves faster.Besides,the dust concentration decays exponentially in vertical direction.