A certain gap spacing between adjacent vehicles is usually inevitable in wind tunnel force tests of high-speed trains under no crosswind, which may affect the wind tunnel test results. Thus, to understand the influence of gap spacings on the train aerodynamics, the aerodynamic drag, pressure distributions and airflow structures of 1/8th-scale high-speed train models with gap spacings of 0, 5, 8, 10, 20, and 30 mm were studied using RANS based on SST k-ω turbulence model. The simulation method was verified by the wind tunnel experiment data. The results show that the gap spacing significantly affects the airflow structure around inter-car gap and aerodynamic resistances of train models. For the high-speed train model scaled at 1/8th at zero yaw, compared with gap spacing of 0 mm, the gap spacings lead to a significant reduction in the aerodynamic drag of the head car and an increase in that of the tail car, whereas which of the middle car is not significant. The maximum difference of the drag coefficient of the entire train model is smaller than 2.0%. When the gap spacing does not exceed 8 mm, the discrepancies of the drag coefficients of three cars are within 6.15%.

在无侧风的高速列车风洞力测试中，相邻车辆之间通常会有一定的间隙间距，这可能会影响风洞测试结果。因此，为了了解间隙间距对列车空气动力学的影响，间隙间距为0、5、8、10、20和30的1/8比例高速火车模型的气动阻力，压力分布和气流结构使用基于SSTk-ω湍流模型的RANS研究了mm。风洞实验数据验证了该仿真方法的正确性。结果表明，间隙间距显着影响车厢间隙周围的气流结构和列车模型的空气动力学阻力。对于零偏时比例为1/8的高速火车模型，与0 mm的间隙间距相比，间隙间距导致头车的空气阻力明显减小，而尾车的空气阻力增大，而中间车中的空气阻力并不明显。整个火车模型的阻力系数的最大差异小于2.0％。当间隙间距不超过8mm时，三辆车的阻力系数差异在6.15％以内。