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为了优化重型卡车的风阻系数,研究了卡车尾部扰流翼和驾驶室与货箱连接间隙调整对阻力系数降低的作用,并考虑了无风条件下实际行驶过程中地面与车体相对运动和车轮受压形状改变对阻力的影响。运用低速风洞试验与商业软件FLUENT,在不同减阻附件安装情况下,分析了美国标准Class 8卡车的车身绕流特性与阻力系数的变化。研究结果表明:车身连接处与尾部扰流翼减阻附件的安装可以减弱货箱前部气流分离和尾部涡量,从而降低卡车阻力系数。在90km·h-1经济速度下,安装2组减阻附件后的卡车阻力系数最高可降低16.2%,最小值可达到0.485 4。
In order to optimize the drag coefficient of a heavy truck, the effect of adjusting the clearance between the rear spoiler and the cab and the cargo box on the resistance coefficient is studied. The relative movement between the ground and the vehicle body and the wheel The impact of pressured shape change on resistance. Using low speed wind tunnel test and commercial software FLUENT, the change of body flow characteristics and drag coefficient of American Standard Class 8 truck was analyzed under the different mounting conditions of drag reduction attachment. The results show that the installation of body attachments and tail spoiler attachment can reduce the airflow separation and tail vorticity at the front of the container and reduce the truck drag coefficient. Under the economic speed of 90km · h-1, the drag coefficient of the truck with two drag reduction attachments can be reduced by up to 16.2% and the minimum value can reach 0.485 4.