挡板间断型缓冲结构对隧道气动效应的影响

Influence of Discontinuous Buffer Structure on Aerodynamic Effects of Tunnel

摘要:

为解决高速列车穿行隧道过程中带来的车隧气动效应问题,提出一种新型挡板间断型缓冲结构。现阶段,缓冲结构研究尚未针对缓冲节长度比以及挡板间断型缓冲结构相关内容展开。基于^κ-ε两方程紊流模型,利用Ansys Fluent软件提供的动网格技术,模拟高速列车以350 km/h的速度穿行缓冲结构与隧道的全过程。通过优化设计缓冲结构间断距离a、各缓冲节长度L_i、截面积A_i以及节数n等变量,设计出一种能有效减缓压力梯度峰值的挡板间断型缓冲结构。计算结果表明:挡板间断型缓冲结构的间断距离a=0.50 m、各缓冲节的长度比L₁∶L₂∶L₃=1∶1∶1、截面积A₁=A₂=A₃=150 m²、节数n=3时的压力梯度减缓效果最好,达到44.04%。

Abstract:

To solve the aerodynamic effects of road tunnel caused by high-speed trains passing through tunnels, this paper proposes a new type of discontinuous buffer structure. In the current research on buffer structures, no research has been conducted on the length ratio of buffer sections and the discontinuous buffer structure. Based on the ^κ-ε two-equation turbulence model, the dynamic mesh technology provided by Ansys Fluent software is used to simulate the entire process of high-speed trains passing through buffer structures and tunnels at a speed of 350 km/h. By optimizing variables such as the discontinuity distance a of the buffer structure, the length L_i of each buffer section, the cross-sectional area A_i, and the number of buffer sections n, a discontinuous buffer structure that can effectively mitigate pressure gradient peaks is designed. The calculation results show that when these variables are set as a=0.50 m, L₁∶L₂∶L₃=1∶1∶1, A₁=A₂=A₃=150 m² and n=3, the pressure gradient reduction effect is the best, reaching 44.04%.