Study on the effect of eccentric installation of multi-blade centrifugal fan collector on air volume in air conditioning fresh air system
In order to study the influence of the collector on the multi-blade centrifugal fan,a three-dimensional CFD model of the multi-blade centrifugal fan in the air conditioning fresh air system was constructed based on the real air conditioning fresh air system model.The internal flow field of the fan before and after the eccentric collector was analyzed.Finally,the reasonable eccentric installation scheme of the collector was obtained,and was verified by experiments.The results show that when the eccentric angle θ=120° and the eccentricity is l=4.2 mm,the flow in the fan channel is obviously optimized,the blockage of the blade channel is improved,the effective flow area of the impeller is increased,the air velocity at the impeller outlet is increased,the leakage flow between the impeller and the collector is reduced,the fan efficiency is improved,and the air volume at the volute outlet is increased by 3 m3/h with an increase of about 5.6%.The research results can provide reference for the optimization design of multi-blade centrifugal fans.
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