风洞试验中不同厚度挡风墙合理长度的数值研究  

Numerical study on reasonable lengths of wind barriers with different thicknesses in wind tunnel tests

作　　者：成思瑾 刘堂红 李文辉 刘智琦 陈争卫 CHENG Si-jin;LIU Tang-hong;LI Wen-hui;LIU Zhi-qi;CHEN Zheng-wei(Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China;Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China;National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075,China;National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch),Hung Hom,Kowloon,Hong Kong 999077,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong 999077,China)

机构地区：[1]Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China [2]Joint International Research Laboratory of Key Technology for Rail Traffic Safety,Central South University,Changsha 410075,China [3]National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle,Changsha 410075,China [4]National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch),Hung Hom,Kowloon,Hong Kong 999077,China [5]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong 999077,China

出　　处：《Journal of Central South University》2023年第4期1388-1404,共17页中南大学学报（英文版）

基　　金：Project(2022RC3040) supported by the Science and Technology Innovation Program of Hunan Province, China;Project(2020YFA0710903) supported by the National Key R&D Program of China。

摘　　要：在风洞中,挡风墙的特性对列车的空气动力学特性有重要影响。利用改进的延迟分离涡模拟(IDDES)方法和剪切应力传输(SST)k-ω湍流模型,研究了不同挡风墙厚度下列车气动特性随挡风墙长度的变化。风洞试验结果用于侧滑角为30°时的验证。当挡风墙超过一定长度时,列车的空气动力载荷没有显著变化,可以认为达到了临界长度。通过拟合列车空气动力学系数与挡风墙长度之间的关系,确定了挡风墙的临界长度。挡风墙厚度与临界长度之间的关系满足二次函数y=-57.106x2+10.85x+28.822。当挡风墙厚度大于0.5 m(全尺寸)时,可通过将风洞试验中挡风墙的厚度代入上述函数来获得临界长度,以研究列车的空气动力学特性。In a wind tunnel,the characteristics of wind barrier have a significant effect on the aerodynamic characteristics of a train.Using the improved delayed detached eddy simulation(IDDES)method and the shear stress transport(SST)k-ωturbulence model,the variations of the aerodynamic characteristics of the train with the length of the wind barrier were studied for different wind barrier thicknesses.The wind tunnel test results were used for comparison at a yaw angle of 30°.When the wind barrier exceeded a certain length,the aerodynamic load of the train did not change significantly,and it can be considered to have reached a critical length.The critical length of the wind barrier was determined by fitting the relationship between the aerodynamic coefficient of the train and the length of the wind barrier.The relationship between the thickness of the wind barrier and the critical length satisfied the quadratic function y=−51.235x2+8.659x+29.014.When the thickness of the wind barrier was more than 0.5 m(full-size),the critical length could be obtained by substituting the thickness of the wind barrier into the above function during a wind tunnel test to study the aerodynamic characteristics of the train.

关 键 词：数值模拟 挡风墙 临界长度 空气动力学特性 风洞试验 

分 类 号：U270.1[机械工程—车辆工程] U213.152.2[交通运输工程—载运工具运用工程]