Want to save fuel? You have to close the window like this

do you know? The way of opening the window when driving is usually fuel-efficient. There is a certain amount of knowledge about air flow inside. Come and learn it.

Our ordinary vehicles generally have 4 windows, and the high-end vehicles also have skylights. How to open these windows and the angle of opening reasonably? That's what a primary school asked. Please follow the editor to find out.

Let's first briefly analyze each combination of window openings, and then see what effect they have. (The following analysis is based on the assumption that there is no other crosswind interference from outside)

1. Open the one-sided front window

Friends who smoke in this car generally have experience. The car opens the front window while driving. If you put a gap in the window, the air in the car will squeeze the smoke out of the car. When the window is opened, the air will be squeezed into the car under a strong force and flow out at the rear exhaust port. Generally in this case, the rear passengers on the same side with the windows open will feel uncomfortable due to the strong wind. Depending on the speed of the vehicle, different wind noises will be generated.

2. Open the rear window on one side

Putting a slit in the rear window of one side is basically the same as opening the front window on one side. Under open ventilation, the rear passengers will obviously feel the side wind. At a certain speed, the side wind generally does not affect the passengers. Produce discomfort. However, this type of opening has a general effect on the ventilation in the car.

3. Open two windows on the same side

When the windows on the same side are opened together, the external airflow will directly pour into the car on the side of the vehicle, the passengers at the window will have a strong sense of wind, and the rear passengers will also feel strong discomfort for a long time. When driving at high speed, the direction is difficult to control. It is not recommended for riders to use this kind of ventilation in medium and high speed driving.

4. Only one side front window is closed

In this case, the air entering the car has obvious unevenness, and the air flow in the car has a clear sense of direction. Except for the passengers on the side with the windows closed, all other passengers can feel a strong sense of wind. At this time, the air circulation in the car is faster, and most of the air in the car is quickly discharged. This type of ventilation is suitable for rapid ventilation in the car to remove odors in the car.

5. Only one side of the rear window is closed

Closing the single-side rear windows only causes a large amount of air to accumulate on the side of the compartment where the windows are closed, forming a high-pressure area. This exhaust method is relatively soft. Compared with the former (only the single-side front windows are closed), the passengers in the car There is no obvious upwind feeling, which is a good way of ventilation. But the noise is slightly louder than the two windows on the opposite side.

6. Open diagonal windows at the same time

If you open the window in this way, the air entering the car through the front window will interact with the air entering the car from the rear row, creating a small cyclone. In this way, the air in the car is discharged more quickly and smoothly, and the air flow in the car is also softer. Relative to closing only one side of the rear window, the wind noise generated by this method is relatively low, and the "passing through the wind" flow mode makes the wind resistance lower. Therefore, it is also an ideal ventilation method. In the case of low wind resistance, the vehicle is relatively more fuel efficient when driving.

7. Open the car window

The courageous riders always open the windows together, so that a large amount of air is poured into the cabin, the air flow rate of the exhaust port in the car reaches the peak, and the large amount of air accumulated in the car is likely to interact with each other to generate turbulence. Under the circumstances, even small objects with light texture in the car can be overturned, and the passengers' riding experience is not good during driving. Therefore, under normal circumstances, do not use this method to exhaust.