Axial fan|Axial fan and its air supply form introduction

Introduction to Axial Fan|Axial Fan and Its Air Supply Form Axial fan|fan is a fan|fan whose blade pushes air to flow in the same direction as the axis when it is working. This classification method according to the direction in which the blades push the air and the direction of the shaft can be divided into: axial flow fan, centrifugal fan (intake is along the axis direction, while the outlet is perpendicular to the axis direction), through flow (cross flow) ) Fan (the inlet and outlet of this fan are perpendicular to the axis), mixed flow fan (the inlet of the mixed flow fan is along the axis, but the outlet is along the diagonal direction of the axis and the vertical axis). Axial fan|The air supply form of the fan. The most widespread form is to use an axial fan | blower to blow downwards. The reason why it is so popular is that it has a good overall effect and low cost. In addition, the direction of the axial flow fan is reversed and turned into a form of upward ventilation. This method seems to be becoming more and more common recently. The difference between the two types of air supply is in the air flow. When blowing, it produces turbulent flow, and the wind pressure is high, but it is susceptible to resistance loss; when it is exhausted, it produces laminar flow, with low wind pressure but stable airflow. In theory, the heat transfer efficiency of turbulent flow is much greater than that of laminar flow, so it has become the mainstream design form. However, in some heat sink designs (such as too tight fins), the airflow is greatly obstructed by the heat sink. At this time, the use of air extraction may have a better effect. How to determine which air supply method to use? Generally speaking, when the heat in the equipment is relatively dispersed and distributed, and the wind resistance of the cooling surface is relatively small, suction cooling is usually used; when the heat distribution in the equipment is uneven, the wind resistance is large , In the case of more components, blast cooling is usually used. If necessary, the fans can be connected in series (increase the air pressure), in parallel (increase the air volume), or in series (introduced in the article 'The operation of parallel and series cooling fans').