降雨环境下车身表面水相分布特性

Water Phase Distribution Characteristics of Vehicle Body Surface Under Rainfall Environment

本文建立了汽车外流场空气动力学数值计算模型,结合Lagrangian discrete phase model和Eulerian wall film model两种方法模拟了水相的生成和发展过程。在此基础上,开展不同降雨强度、不同车速条件下的车身表面水相生成计算,研究影响水相分布变化的因素。研究结果表明:在一定的车速和降雨强度条件下,车身水相厚度逐渐增大,最终趋于稳定;当车速一定时,车头、前窗、后窗和侧窗区域水相厚度随降雨强度的增大而增大;当降雨强度一定时,车头、后窗和侧窗水相厚度随车速增大而增大,而前窗水相厚度随车速增大而减小。

In this paper,a numerical simulation model of a vehicle's aerodynamic flow field was established,and the generation and development processes of water phase were simulated with the Lagrangian discrete phase model and the Eulerian wall film model.On this basis,the formation of water phase on the body surface under different rainfall intensity and velocity was calculated,and the factors affecting the distribution of water phase were studied.The results show that under certain conditions of velocity and rainfall intensity,the thickness of water phase gradually increases and finally becomes stable.When the velocity is constant,the thickness of water phase in the front window,rear window and side window increases with the increase of rainfall intensity.When the rainfall intensity is constant,the water phase thickness on the front window,rear window and side window increases with the increase of vehicle velocity,while the water phase thickness on the front window decreases with the increase of vehicle velocity.