突风下高速列车气动特性数值模拟

Numerical simulation on the aerodynamic characteristic of high speed train under the gust

近年来,随着高速铁路建设快速发展以及列车速度大幅提高,列车空气动力学问题变得更加重要.特别是在突风环境下,列车的运行工况更加恶化,列车的安全运行面临新的挑战.采用流体分析方法探讨了突风下行驶在双线高架桥上风向的高速列车的气动特性.数值模拟结果表明,在加速度变化时刻产生明显的突风效应,横向突风对整车的侧向力影响明显,而对阻力和升力的影响相对较弱.通过对气动力系数中压差产生项以及粘性产生项各自的贡献量分析,可为下一步采取措施提高抗突风能力提供工程参考.

With the rapid development of high speed railway construction and the increase of train speed, the aerodynamic problem becomes more and more important. Especially under the gust, the train running conditions are deteriorated and the safe operation faces challenge. By using the fluid analysis method, the aerodynamic characteristic of the high speed train running on double line viaduct in the windward under the gust has been explored. The numerical simulation results show that there is obvious gust effect when the acceleration is changed.The transverse gust will have distinct effect on the side force, while it is relatively weak for the dragging force and lift force. By conducting contribution analysis of pressure difference producing and viscosity producing in aerodynamic coefficient, this paper gives engineering references for improving the gust resistance ability.