The rear spoiler is a protrusion on the top of the tailgate of a car or the rear end of the trunk. It is usually installed on sports cars and is rarely found on ordinary cars.
has a variety of shapes, such as a right-angled triangular protrusion at the rear end of the fuselage, and a flashy and huge shape. There are many sizes from large to small, and some may not be the shape of a rear spoiler at first glance.
What is the role of the rear spoiler?
There is a part called "rear wing" that has a similar shape. In fact, spoilers and wings have different effects.
The wing （GT wing） connected to the modified car changes the airflow generated during driving to downforce （the force that pushes the car to the ground）， thereby improving the grip of the tires and stabilizing the body. Yes it is.
On the other hand, the spoiler is designed to correct airflow and improve fuel economy and stability at high speeds.
When driving, air flows around the car, and the unevenness and shape of the car body changes the speed of the air flowing up, down, left and right.
The air flowing from the front to the rear of the dfsk car body flows around the car at the rear end of the car body. It will not produce a clean air flow, but will generate a force （lift） that pulls the car upward, which will be in the direction opposite to the direction of travel. Generate tension.
This is because the air flowing from the top, bottom, left and right sides gathers at the rear end of the car body at different speeds and angles, and creates a vortex.
The rear spoiler has the function of suppressing the generation of the air vortex and allowing it to flow backwards smoothly, helping to improve driving stability and fuel efficiency, and improve the driving quality of the car.
What is the rear spoiler like?
According to the different installation positions, there are many ways to call, such as the tailgate spoiler installed on the top of the rear end of the vehicle body, the rear spoiler installed on the rear wing position and the rear lower spoiler installed on the bottom of the rear bumper .
In addition, some have fin-like protrusions and some have duck tongues to correct the air flowing above and below the car.
The rear spoiler used for rectification is usually equipped with a diffuser at the same time.
In the lower part of the car, there are many pipes and fuel tanks, especially there are many obstacles to the airflow. By installing the rear under the spoiler and diffuser, the airflow can be significantly improved.
When a car is driving, the air resistance is the greatest. How smooth the air flows to the rear and suppresses the generation of eddy currents behind the vehicle body greatly affects the performance of the car.
Rear spoiler is a very practical device that can keep the air flowing from all directions clean, easy to drive and improve fuel efficiency. Not only is it cool, but it works very well.
When we buy a car, we may not necessarily see the visible places, let alone the invisible places. In these invisible places, the manufacturers may make differences either intentionally or unintentionally, such as cutting. Wind board.
Conditional manufacturers will pass a wind tunnel test for a certain period of time when designing a certain model to determine the noise, drag coefficient, etc. of the vehicle under certain wind speed conditions. However, this test is said to be more expensive, with a cost of 5 per hour. Million, right?
So some manufacturers save this budget （maybe some manufacturers have not realized this aspect yet?）， so you can't find the drag coefficient of some brands or models.
Other places will not be mentioned for the time being. When the vehicle is running at a normal speed, the vehicle speed will basically be higher than the wind speed. Therefore, there will be resistance in many parts of the vehicle, so the wind travels differently when passing through various parts of the vehicle body.
The route may be shifted. For example, if there is wind under the car, most of them will go backwards through the chassis of the car, some wind will hit the protrusions of the chassis, and some will get into the high-speed wheel hub from the inner side of the wheel hub, which will affect the driving of the vehicle. Stability, especially the impact on the wheels, should not be underestimated.
Especially for some SUVs, when the chassis is raised, the center of gravity of the car will be higher, and stability will be affected. Sometimes the external force is really "four or two strokes.
Let me take a look at some models on the market. Peugeot, Volkswagen, Buick and other joint venture brand SUVs are basically equipped with this thing, as indicated by the red circle in the picture:
It can also be seen on Geely SUV and Great Wall SUVs. There are quite a few domestically-produced SUVs but none. It shows that some manufacturers still notice this problem.
At the same time, I found that in some low-priced joint venture cars, non-SUV models of less than 70,000 yuan save this thing, and there are more domestic cars and self-owned brands in the province.
What is the function of this small wind cutting board?
The wind cutting board is generally under the front overhang of the car and a little bit inside in front of the front wheel. It is about 30-40 cm long and 3-4 cm wide. It is divided into hard plastic and soft plastic （hard plastic is more prone to aging）。 About a quarter is blocked in front of the wheel.
When the vehicle is moving, this small board will block and cut off the airflow passing through the chassis and beside the wheels, so as to minimize the impact on the wheels.
During the inspection process, some brands of car front suspension are equipped with a skirt of the same width as this wind cutting board. Although it looks good, it is not practical, and the wind cutting board will be omitted.