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STUDY ON IMPROVING QUALITATIVE CHARACTERISTIC OF CLEANING GRAIN FAN

Chen Geng(Han Kou Brach of Huazhong Science and Technology University, Wuhan)Rao Bi(Huazhong Agricultural University, Wuhan)  
By measuring typical cleaning grain centrifugal fan this paper considers that qualitative characteristic, i.e.the uniformity of the air flow velocity to be distributed along the transverse direction at the exit of the fan does'nt make satisfactery. It has been analysed that the qualitative characteristic is related to the laryngeal structure of the fan. Under the condition of maitaining essential structures of the fan a design method for improving laryngeal structure at the exit of the fan has been advanced in this paper. It has been measured that the variation coefficient of the air flow velocity at the exit of the fan is reduced.
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