基于场协同原理的混合动力机车电气间散热性能分析及结构优化

Analysis of heat dissipation performance and structure optimization ofelectrical room of hybrid electric locomotive based on field synergy principle

针对混合动力机车电气间内部通风散热系统难以细致优化的问题,采用场协同原理分析电气间内部流场散热性能。首先,采用数值仿真的方法分析电气间内部热流场。之后利用场协同原理,优化内流场风道结构及功耗元件分布结构,使电气间内速度场、温度场与场协同角余弦场峰值尽可能匹配,提高散热效果。结果表明,将其内部功耗元件错排安置在中间腔体,可有效提高其内部流场协同程度。优化后,三相电感最高温升下降30℃,其他功耗元件平均最高温升下降14℃。最后从熵产的角度对电气间冷却通风系统进行热力学分析,优化后其散热性能明显提高。

In view of the difficulty of detailed optimization of the electric internal ventilation and heat dissipation system of hybrid electric locomotives,the principle of field synergy is used to analyze the heat dissipation performance of the internal flow field in the electrical room.Firstly,numerical simulation is used to analyze the internal heat flow field in the electrical room.After that,the principle of field synergy is used to optimize the internal flow field duct structure and the distribution structure of power dissipation components,so that the internal velocity field,temperature field and angle cosine field of the electrical room match as much as possible.Therefore,the heat dissipation effect is improved.The results show that staggered placement of its internal power dissipation components in the middle cavity can effectively improve the degree of internal flow field coordination.After optimization,the maximum temperature rise of the three-phase inductance drops by 30℃.The average maximum temperature rise of other power components drops by 14℃.Finally,the thermodynamic analysis of the cooling and ventilation system of the electrical room is carried out from the entropy generation,and the heat dissipation performance is significantly improved after optimization.