【摘要】 为了探索头车流线型区域吹气减阻控制的可行性，采用改进的延迟分离涡模拟方法对不同吹气速度下的列车周围复杂流场进行模拟，通过风洞试验验证数值模拟结果的准确性。研究结果表明：在头车流线型区域采用吹气控制能够显著改变列车周围流场特性；吹气口产生的气流能够避免高速来流对列车表面的直接冲击，有效地减小头车的压差阻力与摩擦阻力；吹气对中间车和尾车的气动阻力影响较小；吹气对列车周围的流场产生干扰效应，使得列车表面部分区域的湍动能增加；当吹气速度增加时，3车模型的减阻率增加，归一化净节约功率增加；当吹气速度为来流速度的0.2倍时，3车模型的减阻率为8.44%，归一化净节约功率为6.74%。更多还原

【Abstract】 In order to explore the feasibility of drag reduction by air blowing in the streamlined area of the head car, the improved delayed detached-eddy simulation method was used to simulate the complex flow around the train at different blowing speeds. The accuracy of numerical simulation was verified by the wind tunnel test. The results show that the flow characteristics around the train can be significantly changed by blowing in the streamlined area of the head car. The airflow generated by the blowing port can avoid the direct impact of the highspeed incoming flow on the train surface. This effectively reduces the pressure drag and friction drag of the head car. Air blowing has relatively small impact on the aerodynamic drag of the middle and tail cars. Air blowing can cause interference effects on the flow around the train, increasing the turbulent kinetic energy in some areas of the train surface. When the blowing velocity increases, the drag reduction ratio and the normalized net power saving of the three-car model increase. When the blowing velocity is 0.2 times of the incoming flow, the drag reduction ratio of the three-car model is 8.44%, and the normalized net power saving is 6.74%.更多还原