Influence of module power supply fan vortex on heat dissipation
2022-08-12


The influence of heating on the power supply is affected by conversion compliance, circuit board layout and heat dissipation. In modular power or electronic systems, air cooling is often used as a heat sink. Therefore, radiators and axial fans are widely used.

Because the working principle of the axial flow fan is to drive the blades connected with it to rotate the Weifang website at a given speed through the motor, thus generating a positive pressure difference between the front and rear of the blades, driving the air around the blades to move along the fixed direction of the motor shaft, the axial flow fan has the characteristics of the bottom of the pressure head and large flow.

The fluid flowing through the outlet of the axial-flow fan is actually the fluid flowing in the axial direction. What effect does the actual rotation direction of the fan have on the internal cooling area of the power supply?

In the modular power supply model, the two models are recalculated by adjusting the rotation direction of the axial flow fan without changing the mesh division of the model. After the calculation converges, the influence of the rotating direction of the fan on the heat dissipation of the whole power supply is analyzed by comparing the change of the flow field and the cross-sectional distribution of the temperature field in the two cases.

By carefully observing the flow field animation of the fan in different rotation directions, it can be seen that the reason why the rotation direction of the fan affects the flow field distribution after the fan rotates is that the rotation direction of the fan determines the spiral direction of the fluid flow at the outlet of the fan.

Therefore, we should make full use of this sign in the actual application process, try to avoid the layout that is not conducive to the heat dissipation of key power elements or large loss power elements in the module power supply, and ensure the rationality and reliability of the thermal design.

The above analysis is only applicable to forced blowing cooling of axial flow fan. For exhaust cooling, the change of the flow field at the outlet of the fan has little effect on its inlet, and the rotation direction of the fan has no effect on the internal heat dissipation of the module power supply.