减阻装置对厢式货车气动特性的影响
Influence of Drag Reducing Device on Aerodynamic Characteristics of Van Type Truck

针对某厢式货车的简化模型，基于计算流体力学理论和方法分别对原始货车模型、加装尾部减阻装置和顶部减阻装置的货车模型进行了数值模拟，获得了原始模型与改进模型的气动阻力系数、速度矢量分布、压力分布以及湍动能分布等气动特性。结果表明：尾部减阻装置及顶部减阻装置均可改善厢式货车的气动特性，降低气动阻力。其中顶部减阻装置改善了驾驶室和货厢之间的气流分布，尾部减阻装置改善了货车尾部的涡流状态，从而降低了风阻。
Aiming at a simplified model of a van type truck, the model of the original truck, the model of the truck equipped with the tail drag reduction device and the top drag reduction device were numerically simulated based on computational fluid dynamics theory and method respectively. The aerodynamic characteristics such as aerodynamic drag coefficient, velocity vector distribution, pressure distribution and turbulent kinetic energy distribution of the original model and the improved model are obtained. The calculation results show that the tail drag reduction device and the top drag reduction device can improve the aerodynamic characteristics of the truck and reduce the aerodynamic drag. The top drag reduction device improves the airflow distribution between the cab and the cargo compartment, and the tail drag reduction device improves the vortex flow at the rear of the truck, so the truck drag is thus reduced