Study on the Influence of Blade Parameters on the Performance of Self-ventilation Fan of Metro Traction Motor
As a common power unit used in rail transit,the performance of self-ventilated traction motor has an important impact on the efficiency and safety of traction system.At present,there is no universal standard for the structural design of self-ventilating fans with bidirectional rotation characteristic within the rail transit industry.In order to understand the specific influence of blade number and blade thickness of traction motor self-ventilating fan on its aerodynamic performance,this paper adopts the numerical calculation method to study a certain type of self-ventilated traction motor fan.The results show that the air flow rate provided by the fan and the consumed shaft power all increase at first and then decrease with the increase of the number of blades,and the number of blades corresponding to the above turning point is not less than 23;The influence of blade number on fan performance is greater than blade thickness and it can keep the maximum efficiency of the fan at a high level that the consistency of blade root at passage inlet is selected between 0.2 and 0.4.Therefore,when designing this type of fan,it is suggested that the number of blades should be no less than 23 and the consistency of blade root at passage inlet should be selected between 0.2 and 0.4.In addition,increasing the number of blades and reducing the thickness of blades can be used as one of the methods to reduce weight while maintaining the performance of fans.
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