Drag coefficient

The so-called wind resistance is the wind resistance. When a vehicle is moving forward, the resistance to the wind is generally from the front unless the wind speed on the side is particularly large. Otherwise, it will not have much impact on the vehicle. Even if it does, it can be corrected through the steering wheel. Wind resistance has a great impact on the performance of cars.

The drag coefficient Cd is a measure of the impact of aerodynamic drag on a car. The smaller the drag coefficient, the smaller the influence of air resistance, and vice versa, so the smaller the drag coefficient, the better.

Generally speaking, most of the cars we see on the road have a drag coefficient of between 0.28 and 0.4. For vehicles with good linearity, such as sports cars, the drag coefficient can reach around 0.25, and some cars can reach around 0.15.

The drag coefficient is directly proportional to the car's fuel consumption. Therefore, reducing the air drag coefficient has important practical significance for reducing the fuel consumption of the car. According to tests, when a car is travelling at 80 km/h, 60% of the fuel is used to overcome wind resistance.

So how to reduce the drag coefficient of the car? The drag coefficient depends on the shape of the car. Undoubtedly, the streamlined body must obtain the ideal drag coefficient. Ferrari and Renault are undoubtedly the leaders in automotive streamlined design. Therefore, when choosing a car, the streamlined shape of the car body cannot be ignored because it directly affects the fuel consumption of the car.