重型集装箱卡车拖车轮胎周围气流管理研究OA

Due to the structural characteristics such as multiple axles,small wheelbase and double wheels,the structural-aerodynamic behavior around the tires of heavy container truck is extremely complex,which will have a very large negative impact on the aerodynamic characteristics and economy of the vehicle.The steady-state Realizable k-ε model is used to establish the vehicle aerodynamic model and carry out experimental verification.By analyzing the airflow field of the trailer tire of the existing heavy container truck,the structure of the covering parts around the trailer tire is modified based on airflow management objectives,and the difference of the airflow field before and after the structure improvement is compared.The results show that before the improvement,the air vortex appears around the tire of the trailer,and strong air turbulence is formed around the tire.The air pressure around the tire of the trailer fluctuates greatly,and a large scale drag vortex is formed after the coupling of the lateral incoming flow and the outflow flow at the wheel edge.After the improvement,the air flow around the trailer tire flows along the longitudinal symmetrical plane of the vehicle,the air flow is relatively stable,the air vortex around the tire is notably suppressed,the air pressure and pressure fluctuation amplitude near the trailer tire are reduced,the scale of the drag vortex outside the tire is significantly reduced,the vehicle resistance coefficient is reduced by 11.33%,and the fuel consumption per 100 kilometers is reduced by 3.45%.