摘要
强横风对高速行驶轿车的操纵稳定性具有重要影响。建立5-9级强横风和不同车速条件下24个轿车参数模型,为减小阻塞效应选用合理的计算域并采用混合网格离散,采用K-ε双方程和速度压力SIMPLE耦合方法分析轿车气动特性,并与无横风时的气动特性进行比较,结果表明:5-9级强横风对不同行驶速度轿车的气动性能均具有较大影响;气动侧向力和横摆力矩会使轿车发生侧滑或偏离航向角;在9级横风作用下轿车的侧倾力矩随车速发生急骤变化,易造成车辆左右摇摆和侧翻,应及时发布风力预警。
Strong crosswind has important effect on automobile steering stability while its running speed is high. The 24 parameter models were set up under 5-9 grade crosswind and at different running speed. To reduce blocking effect rational computational zones were defined and meshed with hybrid mesh technology. Aerodynamic characteristics were analyzed by using k-ε double equation and SIMPLE method for velocity-pressure couple. Aerodynamic characteristics under strong crosswind were compared with those under no crosswind. Results show that 5-9 grade strong crosswind has great influence on aerodynamic characteristics of a sedan at different speed, and aerodynamic lateral force and yawing moment can make sedan sideslip or change course angle, and roll moment of the sedan under 9 grade crosswind varies with running speed quickly and it will make the sedan swing or rollover, and wind warning should be issued in time.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2010年第11期2738-2741,共4页
Journal of System Simulation
关键词
轿车
空气动力特性
强横风
操纵稳定性
数值分析
sedan
aerodynamic characteristics
strong crosswind
steering stability
numerical analysis
