Aerodynamic force/moment for high-speed train bogie in crosswind field
Aerodynamic force/moment for high-speed train bogie in crosswind field
复制标题
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Xi Yanhon
中科院分区：
文献类型：
--
作者：
Xi Yanhon
针对真实的动车组转向架和受电弓在风中运行的配置，采用三维分离涡模拟方法对转向架非定常气动特性进行了数值研究。通过数值计算，分析了转向架非定常力的时域、频域特征和流场结构。计算结果表明，转向架上的气动力具有较强的非定常特性。非定常气动力在频域内有明显的峰值。如果转向架的模态频率范围与此频率相关联，则转向架作为动力系统将在风的非定常气动力作用下发生共振，共振将导致列车运行安全性降低，甚至导致列车倾覆。研究结果可为局部减阻优化和列车抗风设计提供参考。
For the real configuration of CRH with bogies and pantograph running in crosswind, the unsteady aerodynamic characteristics of bogies were studied numerically by the 3D detached-eddy simulation method. The characteristics of the unsteady forces acting on the bogies were presented from the numerical results, which included the characteristics of the time domain and the frequency domain, and the flow structures. The numerical results indicate that the aerodynamic forces on the bogies have strong unsteady characteristics. The unsteady aerodynamic forces have obvious peaks in their frequency domain. If the modal frequency range of bogies interconnected with this frequency, the bogies as a dynamical system will be resonated by the unsteady aerodynamic forces due to the crosswind and the resonance can lead to reducing of the operating safety of the train, and even lead to overturning of the train. The results are helpful to local drag-reduced optimization and train wind resistance design.