线间距和阻塞比对动车组空气动力学性能影响的分析

Analysis of EMU Aerodynamic Performance Influenced by Line Spacing and Tunnel Section

以现场试验为主,并辅以仿真计算,针对明线交会、隧道通过、隧道交会等典型工况,研究线间距和隧道截面积对动车组空气动力学及动力学性能的影响。研究表明:明线交会时,线间距从4.4m变化到5.0m对会车压力波有一定影响,但均交会压力波远小于车体容许气动载荷;隧道通过和隧道交会时,线间距对会车压力波影响较小,影响隧道空气动力学性能的主要因素为隧道截面积或阻塞比。线间距改变对动车组动力学性能影响主要体现在车体横向加速度,轮轨力和脱轨系数等指标未见显著变化。

Through tests,supplemented with simulation,aerodynamic and dynamic performance was studied caused by different line spacing and tunnel section.Test results show that,when EMU passing each other in the open,the line spacing have a certain influence on car body pressure waves,but the waves were much smaller than the vehicle aerodynamic load allowance;when EMU passing through or crossing in tunnels,the line spacing has little effects on train pressure waves,the main factor is tunnel cross-sectional area.The influence of the change of line spacing on the dynamic performance of EMU is mainly manifested in the lateral acceleration on car-body,with no significant change in wheel-rail force and derailment coefficient.