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The diversion is a batch-shaped connecting plate under the front bumper of the car. The spoiler is a ducktail-like protrusion on the rear end of the trunk lid of a sedan.
The role of the deflector and spoiler of automobile stamping parts
(1) Improve the appearance of the car shape
The graceful shape of the spoiler makes the streamline of the body more prominent and the exterior of the body more beautiful.
(2) Improve the driving stability of the vehicle
The principle of diversion and turbulence
The French physicist Bernouyi has proved a theory of aerodynamics, that is, the speed of air flow is inversely proportional to the pressure. That is, the faster the air flow, the lower the pressure; the slower the air flow, the higher the pressure. For example, the wing of an airplane is parabolic on the top, and the airflow is fast; the bottom is smooth, and the airflow is slow, so that the downward pressure on the wing is greater than the upward pressure, resulting in lift. If the shape of the car is similar to the cross-sectional shape of the wing, at high speed, due to the different airflow pressures on the upper and lower sides of the body, the lower part is larger and the upper part is smaller. This pressure difference will inevitably produce a lift force, the faster the vehicle speed, the greater the pressure difference, the greater the lift force. This lifting force is also a type of air resistance, which is called induced resistance in the automotive engineering community, accounting for about 7% of the air resistance of the entire vehicle. Although the proportion is small, it is very harmful. Other air resistance only consumes the power of the car, but this external resistance not only consumes the power, but also produces a supporting force that endangers the driving safety of the car. Because when the speed of the car reaches a certain value, the lift force will overcome the weight of the car and lift the car up, reducing the adhesion between the wheels and the ground, causing the car to float, resulting in poor driving stability.
In order to reduce the lift generated by the car when the car is running at high speed, the car designers have made improvements in the shape of the car, tilting the whole body forward and downward to generate downward pressure on the front wheels, and changing the rear of the car to be short and flat to reduce In addition to preventing the rear wheels from floating due to the negative air pressure acting from the roof to the rear, a downwardly inclined connecting plate is also installed under the bumper at the front end of the car. The connecting plate is integrated with the front apron of the body, and there is a suitable air inlet in the middle to increase the air flow and reduce the air pressure at the bottom of the vehicle. This connecting plate is a deflector.
At the rear end of the trunk of the car, a protrusion like a duck tail is made, and the airflow rushing down from the roof will be blocked to form a downward force. This protrusion is the spoiler. The air deflectors restrict the flow of air through the lower body (to keep the turbulence under the car at a low value and reduce the resistance to the flow of air) and keep the front wheels from lifting. Side skirts direct airflow away from the rear wheels, which reduces airflow disturbance and airflow resistance. The spoiler redirects airflow at the rear of the body, reducing airflow resistance and preventing rear wheel lift.
Another type of spoiler is inspired by the aircraft wing, which is to install a parallel plate at a certain angle to the horizontal at the rear end of the car.The cross-section of this parallel plate is the same as that of the wing, just installed in reverse
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