The working principle of automobile tail is the same as that of airplane wing
The tail wing of the car originated from the racing car first. At that time, the main effect of the car was to provide the car with pressure, enhance the grip of the tire, and make the car move smoothly and bend in the process.
The basic principle of the spoiler used in racing cars is the same as that of the aircraft wing, and it was later transplanted to the ordinary car. The wings of the aircraft are only to produce upward lift forces, while the spoiler wings of racing cars produce downward suppression. When air flows through the wing, because the air flow velocity over the wing is faster and the lower air velocity is slow, the air pressure above the wing surface decreases, and the air pressure below the relative wing surface is larger, so the upward lifting force is generated, and the faster the speed is, the greater the pressure difference. If the wing is reversed, it is a simple racing spoiler, and the effect is the opposite. It produces downward pressure, which is usually called downforce.
Aircraft wing
When the car is moving at high speed, according to the aerodynamics principle, we know that air resistance will be encountered during the course of the car moving. The aerodynamic force in the longitudinal, lateral and vertical directions will be generated around the center of gravity of the car, among which the longitudinal direction is air resistance.
In order to effectively reduce and overcome the influence of the space-time air resistance of the high-speed car, people designed and used the tail wing of the car, which is to make the air produce the fourth effect force on the car, that is, to produce a larger adhesion to the ground, which can offset some lift forces, and can control the car to float up and reduce the wind resistance coefficient accordingly. The car can move close to the road, thus improving the stability of the road. At present, most of the tail wings of cars are made of glass fiber or carbon fiber, which are light and tough, not too large or too small, or they will increase the driving resistance or reduce the drag and energy saving effect of the car. Generally, different shapes of body and different travel speed make up the difference of aerodynamic pressure value, so the air resistance coefficient is different.
Tail of car
Some tests show that when the car speed exceeds 60km / h, air resistance will consume a lot of engine energy and affect the speed. With the rapid development of expressway, the speed of the car has reached about 100km / h. The faster the vehicle speed is, the greater the resistance is, the higher the lift is, the rising air will lift the car, reduce the adhesion between the wheels and the ground, make the car float, and the stability becomes worse, which is prone to traffic accidents.
Tail of car
The effect of the tail wing of a car is to make the air resistance form a downward pressure when the car is moving at high speed, and try to offset the lift force as much as possible. It can be used to control the pressure under the air flow to reduce the wind resistance coefficient correspondingly, rather than to provide an upward lift force as the previous example answers.
