摘要
基于两相耦合的通风盘式制动器热力学研究方法与实际边界条件存在一定偏差。为提升制动器温度场和应力场的计算精度,综合运用紧耦合和松耦合算法,通过MPCCI数据交换平台实现ABAQUS(固体模型)与FLUENT(流体模型)求解器的同步迭代及耦合参数的实时共享,即温度场、应力场和空气流场的完全耦合运算,采用Link3900 NVH台架试验校验温度场计算结果。流体模型动区域采用滑移网格技术处理,湍流模型选择RNG k-ε模型,边界层内的求解选用非平衡壁面函数法,确保第一层网格节点的y+值在30～60。根据通风盘端面和肋片结构设置不同方向的节点路径,得出耦合面温度、应力以及对流换热系数沿不同方向的变化规律。结果表明,对应节点的瞬态温度计算值与试验值表现出良好的匹配性,平均偏差低于4%。该研究方案可有效地保证整体模型的计算精度和效率,为通风盘式制动器的优化设计提供重要的依据。
The brake progress of automobile ventilated disc shows a significant phenomenon of fluid-solid-thermal physics field coupling. To enhance the calculation accuracy of brake temperature field and stress field, the tight coupling and loose coupling algorithms are integrated used. The synchronous iteration of ABAQUS (solid model) and FLUENT (fluid model) solver and the real-time sharing of coupling parameters are realized by MPCCI data exchange platform, which means complete coupling calculation of temperature field, stress field and air flow field, and Link3900 NVH bench test platform is used to verify the calculation results of temperature field. The moving region of the fluid model is treated by the slip mesh technique, and the turbulent model is selected by RNG k-epsilon model. The non-equilibrium wall method is used to solve the boundary layer, and the y+ value of the first layer grid node is near 30-60. In view of the structural characteristics of the end and rib of the ventilated disc, the nodal paths of different directions are set up, and the variation of temperature, stress and convection heat transfer coefficient along the different directions are obtained. The bench test results show that the transient temperature of the corresponding node have good matching with the experimental value, and the average deviation is less than 4%. The research program effectively ensures that the calculation accuracy and efficiency of the whole model, and provides an important basis for the optimal design of ventilated disc brake.
作者
张森
章健
ZHANG Sen;ZHANG Jian(College of Electromechanical Engineering, Binzhou University, Binzhou 256600)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第8期154-164,共11页
Journal of Mechanical Engineering
基金
国家自然科学基金(51705028)
山东省自然科学基金(ZR2016EEB36)
博士科研启动基金(2017Y22)资助项目
关键词
通风盘
流固热耦合
对流换热
MPCCI
台架试验
ventilated disc
fluid-solid-thermal field coupling
convection heat transfer
MPCCI
bench testing
