电力机车变流柜冷却系统流量分配数值研究

Numerical study of flow distribution of cooling system in electric locomotive cabinet

为了保证机车变流器功率模块的正常工作,需要对流过功率模块的冷却液的流量进行研究。文章采用标准k-ε湍流模型对电力机车变流柜冷却系统的流量分配问题进行了三维数值模拟,讨论了总流量大小、主管出口形式、主管进出口位置和支管直径等因素对支管流量的影响。研究发现出口位置的布置对支管流量的分配影响较大,支管离主管出口位置越近,其流量最大;支管离主管进口位置较近时,其流量却有可能最小。此外随着主管总流量的增加和支管管径的增加,每根支管的流量不均匀性亦增加。此研究结果为合理布置功率模块提供一定的参考依据。

In order to ensure the normal operation of the converter power module, it is important to investigate the flow rate of coolant through the power module. The flow distribution issues of cooling system in electric locomotive cabinet numerically simulate by three-dimensional standard k-ε turbulence mode. Then the effect factors on the flow rate of each branch pipe are discussed, including the overall flow rate of main pipe, outlet shapes of main pipe, the location of inlet and outlet of main pipe and branch pipe diameter. It is found that the effect of location of the outlet on manifold flow distribution is larger, and the closer distance of branch pipe away from the outlet of main pipe, the maximum flow rate of branch pipe. However the closer distance of branch pipe away from the inlet of main pipe, maybe the minimum flow rate of branch pipe. Moreover with the increase in branch pipe diameter and the increase in overall flow rate, flow maldistribution of each branch pipe also increases. The results can provide a reference for rational arrangement of the power module.