Abstract: The negative pressure distribution and flow rate at the inlet of the range hood have an important influence on the air performance, It is also important for the effect of smoking. Design a movable adjustment plate in the air duct of the range hood, the adjustment plate can be deflected to different positions. Through the analysis of the working principle of the model prototype, air performance test data analysis, and flow field simulation analysis, to study the effect of the regulating plate in different positions on the air performance and the flow field of the suction outlet. The results show that: when the adjustment plate is in the center position, the negative pressure distribution and flow velocity at the suction port are approximately the same. When the adjustment plate deflects to one side, as the deflection distance increases at the same rotational speed, the negative pressure distribution area and flow velocity of the suction port on the deflection side gradually decrease, the negative pressure distribution area and flow velocity of the suction port on the other side gradually increase.

Key words: Range hood, Flow regulation, Air performance, Simulation calculation