Abstract: A range hood is a type of household appliance that uses a fan as the core component to transport air, and plays an important role in purifying the smoke generated during the cooking process in the kitchen. Noise is an important factor that affects the user experience of products and is also a key aspect that consumers pay attention to when making purchases. Computational Fluid Dynamics (CFD) technology has been widely used in the home appliance industry for fluid mechanical design and optimization simulation of fan duct flow fields. Using computational fluid dynamics to optimize an export vehicle mounted range hood using axial flow impellers, and design a guide ring structure on the outer edge of the axial flow blades. Through numerical simulation, it was found that adding a guide ring structure can block the leakage of airflow along the radial path from the blade tip gap, reduce the impact and disturbance of radial leakage airflow on the mainstream airflow (axial intake), reduce the cutting of radial airflow by the blade tip, improve airflow leakage, and increase the airflow, efficiency, and turbulent noise of the fan blades. The experimental test results show that adding a guide ring structure to the axial flow fan blades of the vehicle mounted range hood contributes approximately 2.89 dB(A) to the overall noise reduction.

Key words: Axial flow fan, CFD, Guide ring, Noise reduction