There are two ways to test the air volume and wind pressure of the cooling fan. One is to use the wind tunnel test, and the other is to use the double box method. But for the average user, there is no such device. You can only use the data provided by the manufacturer as a reference, and ultimately it depends on the cooling effect.
Air volume: Air volume refers to the product of the plane velocity of the fan ventilation area. The ventilation area is the outlet area minus the projected area at the vortex tongue. Plane velocity is the speed of gas movement through the entire plane, and the unit is m3/s. When the plane speed is constant, the larger the outer diameter of the fan blade, the larger the ventilation area and the larger the air volume. The plane speed is determined by the rotor speed and wind pressure. When the ventilation area is constant, the greater the plane velocity, the greater the air volume. The greater the air volume, the greater the heat absorbed by the air. When the air flow is transferred, it can take away more heat, and the fan heating effect is more obvious.
Wind pressure: In order to carry out normal ventilation, it is necessary to overcome the resistance within the ventilation stroke of the fan. The fan must generate pressure that overcomes the air supply resistance. The measured change in pressure is called static pressure, that is, the maximum static pressure. Differential pressure from atmospheric pressure. It is the pressure exerted by a gas on an object parallel to its surface. Static pressure is measured through a hole perpendicular to its surface. Converting the kinetic energy required in gas flow into pressure form is called dynamic pressure. ?