Do you know the functions of automobile stamping air deflectors and spoilers?

2023-12-19 08:32:58

The diversion is an object-shaped connecting plate under the front bumper of the car. A spoiler is a duck-tail-shaped protrusion on the rear end of a car's trunk lid.

The role of automobile stamping parts deflectors and spoilers

(1) Improve the appearance of the vehicle

The graceful shape of the spoiler makes the streamlined shape of the car body more prominent, making the exterior of the car more beautiful.

(2) Improve car driving stability

Principles of diversion and spoiler

French physicist Bernoui once proved a theory of aerodynamics that the speed of air flow is inversely proportional to the pressure. In other words, the faster the air flow rate, the lower the pressure; the slower the air flow rate, the greater the pressure. For example, the upper side of an airplane's wing is a positive parabola, with faster airflow; the lower side is smooth, with slower airflow, causing the lower pressure on the wing to be greater than the upper pressure, creating lift. If the shape of the car is similar to the cross-sectional shape of the wing, due to the different airflow pressures on the upper and lower sides of the car body during high-speed driving, the lower side will be larger and the upper side will be smaller. This pressure difference will inevitably produce a lifting force. The faster the vehicle speed, the greater the pressure difference and the greater the lifting force. This rising force is also a type of air resistance, which is called induced drag in the automotive engineering community and accounts for about 7% of the vehicle's air resistance. Although the proportion is small, the harm is great. Other air resistance only consumes the power of the car, but this external resistance not only consumes power, but also produces supporting force that endangers the driving safety of the car. Because when the speed of a car reaches a certain value, the lift force will overcome the weight of the car and lift the car upwards, reducing the adhesion between the wheels and the ground, making the car float and causing poor driving stability.

In order to reduce the lift generated when the car is driving at high speed, car designers have made improvements to the car's appearance, tilting the entire body forward and downward to generate downward pressure on the front wheels, and changing the rear end to a short and flat shape to reduce In addition to using negative air pressure from the roof to the rear to prevent the rear wheels from floating, a downward-sloping connecting plate is installed under the bumper at the front of the car. The connecting plate is integrated with the front apron of the car body, and has a suitable air inlet in the middle to increase the air flow and reduce the air pressure under the car. This connecting plate is the deflector.

A protrusion like a duck tail is made at the rear end of the trunk of the car to block the airflow rushing down from the roof and form a downward force. This protrusion is a spoiler. The deflector restricts the flow of air through the lower body (minimizing turbulence under the car and reducing the flow resistance of the air), and prevents the front wheels from lifting. Side skirts direct airflow away from the rear wheels, which reduces airflow turbulence and airflow resistance. The spoiler changes the direction of airflow at the rear end of the body, reducing airflow resistance and preventing the rear wheels from lifting.

There is also a kind of spoiler that is inspired by the wings of airplanes. It is to install a parallel plate at a certain angle with the horizontal direction at the rear end of the car. The cross-section of this parallel plate is the same as that of the wing, but it is mounted in reverse