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Time：2022-02-27Views：0
Waterproof fan, due to its unlimited width in theory, large air volume, small size, etc., has been widely used in some departments. Although many scholars have studied the horizontal waterproof fan, there are still some basic issues that need to be further discussed. For example: according to what the gas flows through the cascade twice, how the vortex that controls the flow field in the impeller is formed, and what the gas flow direction depends on (that is, how to determine the inlet and outlet) and so on. To this end, experimental research was conducted. In order to facilitate the observation, photography and static pressure measurement of the flow field, the experiment was simulated with water.
As for the waterproof fan, if the design is improper, it may produce a backwind phenomenon, that is, the inlet and outlet are interchanged. For this reason, a simulation test study was carried out in the water tank.
Waterproof fan shell, the cross flow fan is generally composed of a curve GF (rear wall) with a gradually increasing gap with the impeller, a circular arc or other shape of the vortex tongue BD and the upper boundary DE. The length of the volute tongue and the angle γ between it and the upper boundary DE of the air outlet have a greater impact on the performance of the fan.
(1) The asymmetric outer boundary (including the asymmetry with the impeller gap) is the basic condition for the waterproof fan to make the fluid flow stably in a certain direction.
(2) When the impeller drives the fluid to rotate, if there is only a straight line boundary in the flow field, a vortex is formed at the inner edge of the impeller near this boundary, downstream of the small gap in the direction of rotation of the impeller. The rotation direction of the vortex of the waterproof fan is the same as that of the impeller, and the strength of the vortex mainly depends on the rotation speed and boundary conditions of the impeller. The flow field inside and outside the impeller is mainly controlled by this vortex.
(3) If there are multiple boundaries, the flow field depends on the combined influence of each boundary. The vortex appears near the boundary where the flow resistance difference is extremely large, and there is only one vortex.
(4) For the waterproof fan, in order to make it work normally without reversing the wind, compared with other boundaries, there should be a larger difference in flow resistance at the vortex tongue.
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