Numerical Analysis of Flow-Induced Noise and Fan Performance in Suction Nozzle of a Vacuum Cleaner with a Double-Blade Fan

이중 블레이드 팬이 장착된 진공청소기 흡입 노즐내 유로 유동 소음 및 팬 성능 해석

Rotary performance and flow resistance induced by each element in suction nozzle of a vacuum cleaner with a double-blade rotary fan are investigated numerically and its relation with flow-induced noise and rotary performance is examined. Flow resistance and vorticity in suction nozzle are calculated and it is found that they are closely related with flow-induced noise. Gap between double blades, adoption of cross-flow fan, enlargement of flow inlet area, and optimization of blade number are tested for noise reduction. Finally, the effects of each method are verified experimentally. It is found that several combinations of the proposed methods can be adopted for noise reduction although the degree of reduction is not much.