高速运行动车组对防电板的气动作用及稳定性影响

基于三维、非定常N-S方程和k-ε双方程湍流模型,应用FLUENT软件对动车组以250 km/h速度运行时防电板的气动力进行数值计算,并通过ANSYS软件对防电板在气动力作用下的稳定性进行分析.实验结果表明:动车组高速运行所产生的气流对防电板的作用力主要是气动升力;当防电板高度相同时,流线型较差的CRH1动车组对防电板气动作用较大,如当防电板高度为7.5 m,CRH1和CRH2动车组均以250 km/h速度运行时,前种工况防电板所受升力比后者大47.8%;当车型相同时,高度为7.5 m的防电板所受气动力大于高度为7.8 m的防电板所受气动力,如CRH1动车组通过时,前者升力比后者大17.8%;气动力作用下防电板最大位移为0.068mm,稳定性较强.

Aerodynamic function and stability influence of high-speed moving EMUs on insulated boards

Based on three dimensional unsteady N-S equations and the k-ε turbulence model, the software FLUENT was adopted to carry out numerical simulation calculation for aerodynamic force of insulated boards when electrical multiple unit (EMU) passed by at 250 km/h, and the software ANSYS was used to analyse the steady performance. The results show that airflow function induced by moving EMUs to insulted board is mainly lift force. To the same altitude insulated board, the function is bigger from worse streamlines EMU, as CRH1 passes by at 250 km/h, the lift force that 7.5 m-height insulated board receives is 47.8% bigger than the one as CRH2 passes by at the same speed; while the same EMU passes by, aerodynamic function to 7.5 m-height insulated guard is bigger than that to 7.8 m-height one, as CRH1 passes by at 250 km/h, the former is 17.8% bigger than the latter. Due to airflow function, the maximum displacement of insulated boards is 0.068 mm, so the stability is well.