Abstract
The influence of the inlet angle and the outlet angle of the venturi on the fluid flow state in the tube was studied. The control variable method was used to simulate the flow of the fluid inside the venturi by COMSOL software. The results show that when the inlet angle changes from 10.3° to 55°, the fluid flow velocity at the throat of the universal venturi is 19.5m/s, and the pressure varies from 1121.1Pa. When the outlet angle is changed from 10.3° to 55°, the fluid flow velocity inside the venturi varies by 0.8 m/s, and the pressure varies from 6060.2 Pa. Therefore, it can be concluded that changing the angle of the outlet has a greater influence on the negative pressure at the throat of the venturi. The change in the negative pressure caused by changing the inlet angle is weak, but the flow rate changes greatly.
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