Abstract:Aimed at the problem of drag reduction on the van,the air film drag reduction method was adopted on the van body surface,and the influence on air film drag reduction effect by different hole inclinations on the van body surface was discussed by simulating the wind resistance test experiments.Under the condition of the mainstream velocity of 25 m/s and the flow velocity of 3m/s,the wind resistance simulation test was conducted for the van models with different hole inclinations such as 15°,30°,45°,60° and 90°on the van body surface in the variable wind speed resistance measurement device.The results show that the air film drag reduction rate of the van is increased gradually along with the increasing of hole inclinations,when the hole inclination is 90°,it can get the maximum drag reduction rate of 5324%.