摘要
以简化的直背式轿车模型为研究对象,以商用计算流体力学软件STAR-CD为工具,利用移动边界条件进行三维数值模拟,计算了加装行李架前后的轿车在不同车速下的车身气动阻力系数和升力系数,并通过与试验结果的对比,验证了数值计算结果的正确性.计算结果表明,不同剖面形状的行李架对直背式轿车外流场有不同程度的影响.研究结果为合理选择行李架的剖面形状,改善轿车的气动特性提供了依据.
The aerodynamic characteristics of a simplified fast back car with roof rack were studied with numerical methods of moving groud boundary condition with the CFD code STAR-CD. The drag and lift coefficient of the cars with and without roof rack at different forward speeds were calculated. Compared with the test, the results of the numerical calculation were verified correctly. It was confirmed that roof racks with dif- ferent shapes have different influence upon the outer flow field of cars . The research results provided the foundation for choosing the shape of the roof rack and improving the aerodynamic characteristics of cars.
出处
《车辆与动力技术》
2008年第3期15-19,共5页
Vehicle & Power Technology
关键词
直背式
行李架
数值模拟
fast back
roof rack
numerical simulation
