应用正交试验法冷却风机结构参数优化设计

Optimization Design of Cooling Fan Structure Parameters Based on Orthogonal Experiment Method

强制通风冷却是电驱动式自卸车轮边驱动电机冷却的重要形式,需要设计专门的冷却风机和冷却风道,冷却风机的性能直接影响系统的正常工作;安装空间限制了冷却风机的尺寸,根据某车型的结构尺寸和冷却系统的结构特点,选用离心式冷却风机,对其结构参数进行设计和分析;基于计算流体力学仿真分析对影响风机性能的结构参数进行单因素分析,获得参数对气动性能的影响规律,获取主要的影响因素;基于正交试验法,对多因素组合对冷却风机性能的影响进行分析,获取最优组合,从而对冷却风机的结构参数进行优化。采用冷却风道对优化前后风机的性能进行对比分析;结果可知:优化后风机流量为4.36m~3/s,消耗的功率为34.2kW,比原始设计模型流量增加了19.8%,而功率只增加了16.3%;对优化模型的试验结果也说明风机的性能有了明显的提升,对风机的整体优化具有指导意义。

Forced ventilation cooling is an important form of electrically driven dump wheel drive motor cooling.Special cooling fan and cooling duct need to be designed.The performance of cooling fan directly affects the normal operation of the system.According to the structural size of a car and the structural characteristics of the cooling system,centrifugal cooling fan is selected to design and analyze its structural parameters.Based on computational fluid dynamics simulation analysis,single factor analysis is carried out on the structural parameters that affect the performance of the fan.The influence law of parameters on aerodynamic performance is obtained,and the main influencing factors are obtained.Based on orthogonal test method,the effect of multifactor combination on cooling fan performance is analyzed to obtain the optimal combination to optimize the structural parameters of the cooling fan.The performance of the fan before and after optimization is compared and analyzed by using cooling duct and cooling duct.The results show that the optimized fan flow is 4.36 m cubed/s,and the power consumed is 34.2 kW,which increased by 19.8%compared with the original design model flow,while the power only increased by 16.3%.The test results of the optimized model also show that the performance of the fan has improved significantly,which is of guiding significance to the overall optimization of the fan.