Everyone's car.Cooling fanThere are a lot of misconceptions, two of which need to be popularized.
First, it is necessary to explain the operation principle of the cooling fan. Many people think that the cooling fan is used to cool the water tank before cooling, otherwise, the fan will not be designed behind or in the middle of the water tank; however, this understanding is absolutely wrong because it involves a common sense problem. The car needs to overcome the wind resistance during the driving process, and the air has no dead angle under the action of gravity; then, the car needs to push the air away during the driving process, which will lose the power on the wheels-which can be defined as driving resistance.
In order to overcome driving resistance, cars are always designed to be lower and lower to reduce the collision surface to reduce driving resistance. Similarly, the design of the aircraft is the same, only the lower the forward resistance, the lower the power loss-the key point: what is the power angle of the jet? Obviously, let the airflow blow backward, if the angle of the engine is adjusted to blow forward, Will the aircraft reverse? The answer is obviously not controversial. So far, there is also a standard answer for the wind direction of the car cooling fan.
Wind resistance is static resistance. If the fan blows forward, it is equivalent to adding a low-power jet engine reducer to the car. The dynamic resistance is equal to the multiple level to increase the wind resistance, which greatly reduces the power of the car and greatly improves the fuel consumption of the car. Therefore, the car cannot be designed this way.Cooling fanThe main function of is not blowing, but pumping; turbulence will form in the engine compartment during driving. Only through the suction of the cooling fan can the turbulence be guided into the airflow of the fixed flow direction, thereby effectively dissipating heat.