摘要
为了解决麦弗逊悬架运动造成其翼子板内流场特性多变的问题。通过将问题简化为绕流圆柱平面流场,首先利用湍动能-比耗散率剪切压力传输模型方程对静态的圆柱绕流体模型进行理论计算和仿真,获得了稳定涡旋下的升力、阻力系数及斯特劳哈尔数等特征值。在此基础上,分析空气流速、减振器直径、横向振动频率和振幅等结构和动力学参数对涡旋动态特性的影响,获得了平均升力系数和瞬时阻力系数曲线的拟合方程。结果表明,斯特劳哈尔数的最大误差为5%,简化模型忽略减振器结构的三维效应是可以接受的;脱涡频率与减振器直径的倒数成二次关系;横向振动频率则对动态脱涡频率起到了关键作用,且对流场的压力分布影响显著,而横向振幅对无边界流场条件下的涡旋特性及压力场分布影响不大。
The problem of variable flow field characteristics in the fenders caused by MacPherson suspension is one of the difficulties that hamper the energy regeneration of swirling around the shock absorber. This problem is simplified as a flow past the cylindrical in two-dimensional space. First, using the turbulent kinetic energy-specific dissipation rate equation to perform theoretical calculations and simulations on a static cylindrical flow model, the characteristic values of lift, drag coefficient and Strouhal number etc under stable vortex are obtained. On this basis, the effects of structural parameters such as air velocity, shock absorber diameter, transverse vibration frequency and amplitude on the dynamic characteristics of the vortex are analyzed, and the fitting equations of the average lift coefficient and the drag coefficient curve are obtained. The results show that the maximum error of Strouhal number is 5%;The simplified model that ignores the three-dimensional effect of the shock absorber structure is acceptable;The frequency of vortex shedding is in quadratic relation to the inverse of the shock absorber diameter;Transverse vibration frequency plays a key role in the frequency of dynamic vortex shedding;And transverse vibration frequency has a significant influence on the pressure distribution of the flow field;The lateral amplitude has little effect on the vortex characteristics and pressure distribution under the boundaryless flow field conditions.
作者
刘双双
柳江
王政皓
LIU Shuang-shuang;LIU Jiang;WANG Zheng-hao(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China)
出处
《科学技术与工程》
北大核心
2019年第5期297-306,共10页
Science Technology and Engineering
基金
国家自然科学基金(51575288)资助
关键词
麦弗逊悬架
能量再生
绕流涡旋
涡激振动
MacPherson suspension
energy regeneration
flow past the cylinder
vortex induced vibration
