摘要
基于有限体积法,采用流体动力学计算软件建立不同线间距条件下城际动车组明线交会和隧道内交会的空气动力学模型,运用滑移网格技术数值模拟了动车组交会时的三维非定常可压缩外流场,分析线间距对动车组交会时空气动力学效应的影响。研究结果表明:CRH2型动车组车体表面所受风压最大值、平均值比CRH6A型动车组分别小10.70%,18.60%;动车组以250 km/h及以下速度级交会车体所受风压最大值在线间距4.2,4.0 m情况下较线间距4.4 m情况下分别增加约10%,25%;线间距由4.4 m减少到4.0 m,或隧道断面由72 m2减少到64 m2,动车组隧道内交会时车体表面所受风压最大值和风压变化最大值增加幅度较小;动车组以200 km/h速度在隧道内交会车体表面所受风压最大值比明线交会增加了约30%。
The aerodynamic models of the intercity EMU trains meeting in open air and in tunnel with different distance between tracks were established based on the finite volume method by using the fluid dynamics software.The three dimensional unsteady compressible external flow fields of the EMU trains meeting were simulated by applying sliding mesh technology and the influence of distance between tracks on aerodynamic effect when the EMU trains meeting each other was analyzed.The research results show that the wind pressure maximum value and average value of the CRH_2 EMU train surface respectively decreases by 10.70%and 18.60%compared with the value of CRH_（6A） EMU train,wind pressure maximum value of EMU train surface with distance between tracks of4.2 m and 4.0 m respectively increases by 10%and 25%compared with the value in condition of 4.4 m distance between tracks when EMU trains meeting each other at or below the speed of 250 km/h,wind pressure maximum value and its increase amplitude is small when EMU trains meeting each other with distance between tracks reducing from 4.4 m to 4.0 m and tunnel section reducing from 72 m^2 to 64 m^2,and when EMU trains meeting in tunnel at speed of 200 km/h the wind pressure maximum value of EMU train surface increases by about 30%compared with the value when EMU trains meeting in open air.
出处
《铁道建筑》
北大核心
2016年第10期101-104,共4页
Railway Engineering
基金
中国铁路总公司研发中心课题(J2016T002
J2016T003)
关键词
空气动力学
线间距
明线交会
隧道内交会
Aerodynamics
Distance between tracks
Trains meeting in open air
Trains meeting in tunnel
