摘要
在整车开发过程中,为更好地用车外流场的CFD分析为汽车气动外形进行设计和优化,文章针对某重型牵引车,利用基于LBM方法的大型商用CFD软件PowerFlow,建立了整车三维计算模型,并进行了外流场数值模拟,计算得到该重型牵引车的阻力系数为0.621,通过分析车身的压力分布及车身周围的速度分布等情况,提出了基于CFD分析结果的改进措施:在货箱前端和后端各加一个导流装置。结果表明:改进后整车风阻系数为0.589,较原来降低5.15%,效果较显著。该方法为整车气动性能设计提供了理论依据。
In the process of vehicle development, the external flow field CFD analysis is the main measures for aerodynamic shape design and optimization. 3l） model of a heavy-duty tractor is built, and the numerical simulation of the external flow field was taken by CFD software PowerFlow using the LBM method on it. The drag coefficient of the tractor is calculated to be 0.621. After the pressure distribution of the body and the velocity distribution around the vehicle are analyzed, improvement measures are put forward according to the resuhs obtained from CFD analysis, i.e. a deflector is added at the front of cargo body and the rear of it respectively. The resuhs indicated that the drag coefficient is 0.589, 5.15 percent lower, and the effect was quite prominent after improvement. It offered the theory basis for the aerodynamic performance of the vehicle.
出处
《汽车工程师》
2013年第5期25-28,59,共5页
Automotive Engineer
基金
"十二五"制造业信息化科技工业示范企业项目(陕科高发[2012]105号)
陕西省重点新产品项目(2012XCP-25)
陕西省工业领域重大科技成果产业化项目(陕工信发[2012]371号)
