Abstract

Both aerodynamic and aeroacoustic performance of collateral axial flow fan system inside outdoor unit of air-conditioner is investigated by experiment and CFD simulation. Noise spectrum of outdoor unit is composed of broadband and discrete frequency noise. The main contribution of noise is broadband one. The discrete frequency noise is located at blade passing frequency and its harmonics of the upside and downside impeller respectively. Little interaction is found between downside and upside impeller through results of acoustic and flow filed. Vortex sound theory shows that broadband noise of outdoor unit is mainly caused by vortex shedding at trailing edge of impeller and discrete noise is caused by tip vortex. Based on acoustic analogy and CFD simulation, broadband and discrete frequency noise is well predicted with little error to experimental one.

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