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力学与实践 ›› 2006, Vol. 28 ›› Issue (6): 0-0.doi: 10.6052/1000-0992-2005-371

• 应用研究 •    

汽车车轮流场的数值模拟

许清霖 康宁   

  1. 北京航空航天大学汽车工程系 北京航空航天大学汽车工程系
  • 收稿日期:2005-09-28 修回日期:2005-11-14 出版日期:2006-12-10 发布日期:2006-12-10

THE STUDY OF CFD FOR MODELING THE FLOW AROUND AN ISOLATED WHEEL

  • Received:2005-09-28 Revised:2005-11-14 Online:2006-12-10 Published:2006-12-10

摘要: 首先以独立车轮为研究对象,以商用计算流体力学软件STAR-CD为工具,利用移 动边界条件,并依据$k$-$\varepsilon$双方程高雷诺数湍流模型对三维定常不 可压缩流N-S方程进行数值模拟计算. 然后在合适 尺寸的计算域下对3种不同宽度的静止和滚动车轮分别进行数值模拟计算,研究车轮宽度和 来流速度对阻力系数的影响,将计算结果与实验结果进行了对比分析. 计算结果表明,车轮 宽度的减小以及来流速度的减小均明显降低汽车的气动阻力系数.

关键词: 独立车轮, 数值模拟, 汽车空气动力学

Abstract: The model of the stationary and rotating isolated wheels is studied with numerical methods under fixed ground boundary conditions. Based on the $k$-$\varepsilon$ two-equation high Reynolds number model, the 3D steady incompressible N-S equations are solved numerically with the CFD software STAR-CD. The drag coefficients of three different breadth stationary and rotating isolated wheels are calculated in an appropriate computational domain, then the relationship between breadth, velocity of the flow and drag coefficient is discussed. In addition, from the calculated results and test results, the paper also discusses the velocity field and the pressure field around the wheels.

Key words: stationary wheel, numerical simulation, automobile aerodynamic