摘要
为了研究风雨环境对汽车空气动力学性能的影响,本文基于Euler-Lagrange方法建立风雨环境下汽车空气动力学模型,采用M-P(Marshall-Palmer)雨滴谱对雨滴降落进行数值模拟。基于风-雨双向耦合算法进行风场和雨滴迭代模拟,开展不同侧偏角,不同降雨强度条件下汽车空气动力学特性研究。计算结果表明,当侧偏角相同时,车身迎风侧所受正压、车身表面的雨滴浓度及单位时间内降落至车身的雨滴质量均随着降雨强度的增大而增大,且雨滴降落位置主要位于前车窗附近,汽车的气动阻力系数随降雨强度的增大而增大;当降雨强度相同时,汽车的气动阻力系数随侧偏角的增大先增大后减小,而侧偏角的增大或降雨强度的增大,均会导致汽车的气动性能恶化。该研究为车辆安全行驶提供了理论依据。
In order to study the influence of wind and rain environment on automobile aerodynamic performance,based on the Euler-Lagrange method,an automotive aerodynamic model is established,and M-P(Marshall-Palmer)raindrop spectrum is used to numerically simulate the raindrop falling.Based on the wind-rain two-way coupling algorithm,the iterative simulation of wind field and raindrop is carried out to study the aerodynamic characteristics of automobiles under different sideslip angles and different rainfall intensities.The simulation results show that when the sideslip angle is the same,the positive pressure on the windward side of the body,the concentration of raindrops on the surface of the body and the mass of the raindrops falling to the body per unit time all increase with the increase of rainfall intensity,and the landing position of raindrop is mainly located near the front window,and the aerodynamic drag coefficient of the vehicle increases with the increase of rainfall intensity.When the rainfall intensity is the same,the aerodynamic drag coefficient of the vehicle increases first and then decreases with the increase of the sideslip angle.In general,the increase of sideslip angle or rainfall intensity will lead to the deterioration of the aerodynamic performance of the vehicle.
作者
胡春雨
于梦阁
盛旭高
李美香
HU Chunyu;YU Mengge;SHENG Xugao;LI Meixiang(College of Mechanical and Electrical Engineering,Qingdao University,Qingdao 266071,China)
出处
《青岛大学学报（工程技术版）》
CAS
2023年第1期77-84,共8页
Journal of Qingdao University(Engineering & Technology Edition)
基金
国家自然科学基金资助项目(51705267)
中国博士后科学基金资助项目(2018M630750)。
关键词
雨滴谱
降雨强度
离散相
风雨载荷
气动性能
raindrop size distribution
rainfall intensity
dispersed phase
wind and rain load
aerodynamic performance
