保温套衬对季冻区隧道空气动力学的影响研究-《高速铁路技术》

文章信息/Info

Title:: Effect of Thermal Insulation Lining on Tunnel Aerodynamics in Seasonal Frozen Zone

Author(s):: LIU Longwei; HOU Zhan; CUI Guangyao; QI Jiasuo; 1. The First Construction Division Co., Ltd. of China Railway Tunnel Group, Chongqing 401123, China;
2. North China University of Technology, Beijing 100144, China

Keywords:: tunnel|aerodynamics|insulation sleeve lining|lining pressure|clearance area

摘要:: 本文基于有限体积法，采用流体力学计算软件建立了隧道内高速列车通过的空气动力学模型，使用CFD滑移网格技术划分模型流场动网格，再使用流体动力学计算软件FLUENT进行数值分析，模拟列车通过隧道时的三维非定常可压缩流场，研究列车通过隧道时的衬砌空气动力学规律与隧道净空面积对衬砌空气动力学特性的影响。研究结果表明：（1）衬砌压力在列车车头到达时达到最大，车头经过后衬砌压力逐渐减弱；（2）增设保温套衬后，隧道净空面积由72 m²减少为69 m²，隧道中部衬砌压力增加2.93%，隧道进口衬砌压力增加6.29%，隧道出口衬砌压力增加3.22%；距隧道入口100 m后的衬砌压力变化最大值成收敛趋势，不再持续增长。

Abstract:: Based on the finite volume method, the fluid dynamics calculation software is adopted to establish the aerodynamic model of train passing through the tunnel, CFD sliding grid technique is used to divide the dynamic grid of model flow field, then the fluid dynamics calculation software FLUENT is used for numerical analysis to simulate the three-dimensional unsteady compressible flow field when the train passes through the tunnel, and to study the aerodynamic law of the lining and the influence of tunnel clearance area on the aerodynamic characteristics of the lining when the train passes through the tunnel. The results show that:(1) the tunnel lining pressure reaches the maximum when the locomotive arrives, and the tunnel lining pressure gradually decreases after the locomotive passes through; (2) after adding thermal insulation lining in the tunnel, the clearance area of the tunnel is decreased from 72 m² to 69 m², the lining pressure in the middle of the tunnel increases by 2.93%, the lining pressure increases by 6.29% at the tunnel entrance and by 3.22% at the tunnel exit, after 100 m from the tunnel entrance, the maximum value of lining pressure changes converges and does not continue to increase.