The operating principle, functions, and features of automotive cooling fans.
Category:
Industry Trends
Release time:
2022-03-28
Everyone's Car Cooling fan There are many misconceptions, two of which need to be widely disseminated.
First, it’s important to explain the operating principle of cooling fans. Many people assume that cooling fans are designed to cool the radiator before the coolant is circulated—otherwise, why would the fan be positioned behind or in the middle of the radiator? However, this understanding is absolutely incorrect, as it stems from a basic common-sense misconception. During driving, a car must overcome aerodynamic drag, and air, under the influence of gravity, flows without dead spots. Consequently, as the car moves forward, it has to push air aside, which results in a loss of power at the wheels—this loss can be defined as driving resistance.
To overcome driving resistance, cars are increasingly designed to be lower and lower, reducing the surface area exposed to air flow in order to minimize drag. Similarly, aircraft are also designed with this principle in mind: the smaller the forward drag, the less power is lost. Here’s the key point: What is the optimal angle for jet engines? Obviously, if we direct the airflow backward—what happens if the engine’s angle is adjusted so that it blows forward instead? Would the aircraft then move backward? The answer is clearly beyond dispute. Likewise, the direction of airflow from car cooling fans has long had a standard answer.
Aerodynamic drag is static resistance. If a fan blows forward, it’s equivalent to adding a low-power jet engine retarder to the car. Dynamic resistance increases aerodynamic drag exponentially, significantly reducing the car’s power and greatly increasing its fuel consumption. Therefore, cars simply cannot be designed this way. Cooling fan Its primary function is not to blow air, but rather to extract air. During driving, turbulent airflow forms in the engine compartment of a car. Only by means of the suction created by the cooling fan can this turbulent flow be directed into a steady, unidirectional airflow, thereby effectively dissipating heat.
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