Abstract: Multi-channel range hood can improve the smoking effect by adding upper and lower smoking ports, and the concept of large air volume and high suction force currently promoted by the market also makes the noise during use of range hoods an urgent problem to be solved. Computer Fluid Dynamics (CFD) plays an important role in the design of range hood, which is used to simulate and analyze the flow field of three-dimensional structure model to guide structural optimization and production. An optimized structure of the front air duct of a multi-channel range hood is designed, and a liner panel is added to the upper smoking port, aiming at enhancing the smoking effect and reducing the noise level. The numerical simulation method is used to compare and analyze the multi-channel range hood before and after adding the liner panel. It can be found that after adding the liner panel, the vortex at the upper inlet is reduced, the upper and lower intake air distribution ratio is more reasonable, the gas flow efficiency is higher, and the smoking effect is improved. At the same time, after the test of the range hood prototype, it was found that the whole smoking effect was better after the liner panel was added, the smoke flow leakage was less, and the noise level of the whole machine decreased by about 1 dB(A).

Key words: Multi-channel range hood, CFD, Optimization of front air duct, Noise reduction