Abstract: Proximity range hoods have gained well promotion in recent years due to their close distance from exhaust port of the range hood to the cooking stoves and good smoke extraction performance. However, constrained by the morphology of proximity range hoods, the elongated distance between the front end and the fan leads to high flow resistance and high noise. In order to solve the problem of high noise caused by the long airflow path of the proximity range hoods, simulation and experimental methods were used to study the key dimensions of the front cavity depth and the guide plate position of the proximity range hoods. The study results show that reducing the cavity depth reduces the turbulence and pressure fluctuations in the hood, optimizing the flow velocity and pressure distribution and results in a noise reduction of 1.83 dB(A) by decreasing the cavity depth. Additionally, lowering the position of the guide plate reduces the distribution of high-velocity regions within the cavity and decreases the turbulent energy of the airflow, leading to a further noise reduction of 0.53 dB(A). The simulation and experimental results show that optimizing the depth of the cavity and the position of the guide plate can effectively reduce the noise level of the range hood. This study provides useful reference for the further researches and development of proximity range hoods.

Key words: Proximity range hoods, Depth of the cavity, Position of the guide plate, Noise