1. Regardless of the aerodynamic stage: this is the initial stage.
2. Basic forming stage. At this stage, people directly use the reasonable shape of moving objects in the current to build cars, such as torpedoes and motorboats. This is an epoch-making change, which opens the development era of automobile aerodynamics! People think that the movement of cars in the air can imitate the movement of motorboats in the water. It's naive. They forgot that cars have four high-speed wheels. I didn't realize that when the air flows through the rotating runner, it is different from the simple drop-shaped flow field and doesn't conform to the principle of fluid mechanics. This one. The interior space of this shape is not ergonomic and has poor practicability. This second. Exposed wheels increase aerodynamic drag. This third one. As a result, a model with cross-era significance appeared!
3. Streamlining stage. Lapoulle designed a low-resistance car with aerodynamic drag coefficient CD=0.28 by using the theory of aerodynamicist Jerry (the minimum drag shape is a streamlined half-body). As a result, the lower half of the torpedo was cut off, and the remaining half greatly reduced the aerodynamic drag coefficient. Moreover, he designed the wheels in the hood, which reduced the aerodynamic resistance by 50%! ! ! ! ! ! This is the second epoch-making change in the development of automobile aerodynamics! However, such a narrow space is not suitable for people to move in the car. Then, the third epoch-making change came out! W.E.Lay's research concluded that the short and thick tail only slightly increased the aerodynamic drag coefficient compared with the long tail.