Study Of Aerodynamic Drag Feature On Automobile With Non-smooth Surface

With the rapid development of national economy, automobile has become a popular consumer good in people's daily life. At the same time, the problem of energy consumption is becoming more and more serious due to the fast-growing amount of automobile consumption, particularly when considering the fact that the world's energy crisis is aggravating, petroleum resources are becoming rare and petroleum prices are continuingly rising. It's becoming a matter of urgency for us to improve the fuel consumption and reduce energy consumption.Automotive air resistance is one of the most important parts in automobile driving resistance. Generally speaking, when the car is running at high speed, most of the driving force from fuel consumption is used to overcome air resistance. Meanwhile, the average running speed of modern vehicle is increasing because of the rapid development of high-class highway, which makes the energy consumed in overcoming air resistance growing. It can clearly be seen that reducing car's air resistance is an important channel to reduce energy consumption and increase fuel efficiency.The non-smooth surface morphology, which is ubiquitous in nature, was applied to automobile in this paper. Moreover, this paper also used computational fluid dynamics (CFD) to study the feasibility of aerodynamic drag reduction on automobile by using bionic non-smooth automobile surface. Besides, this paper analyzed the effects of non-smooth automobile surface on pressure drag, induced drag and frictional resistance by researching external flow field of automobile and components of automobile air resistance. What's more, the mechanism of drag reduction was also analyzed in this paper based on the formation process of pressure drag, induced drag and frictional resistance, which provides theoretical basis for further studying the reduction effect of non-smooth surface.