关键词: 冰箱冷凝风机;导流罩;数值模拟;噪声

Abstract: In order to study the effect of the deflecting ring on the noise generated by axial fan for condenser in refrigerator, numerical method is used in the simulation of the flow field generated by axial fan with different deflecting rings. Vortex exists in the gap between blade top and deflecting ring has been acquired and characteristics of turbulence intensity in outlet of fan have been analyzed. Some conclusions have been acquired with experimental results. Compared with the semi-open type deflecting ring, noise level of fan with closed type deflecting ring is much higher at multiple frequency bands; Turbulence intensity and its decreasing rate in outlet of fan are much higher; Noise levels of single fan and refrigerator are decreased when semi-open type deflecting ring is used. In addition, effect of length of semi-open type deflecting ring on turbulence intensity and noise of refrigerator has been researched, and optimal length for lowest noise level is acquired. Better flow and noise performance will be obtained when axial fan for condenser in refrigerator is with semi-open deflecting ring.

Key words: axial fan for condenser in refrigerator;deflecting ring;numerical simulation;noise