集中式动力单元冷却风机工作点校核

Cooling Fan Working Point Check of Centralized Power Unit

集中式动力单元具有集成功率高和种类多等优点,但也具有风道结构复杂、散热器种类繁多和冷却风机工作点校核困难等缺陷,使传统理论计算方法在计算准确度和时间上均无法很好地满足设计周期要求。利用有限元仿真方法对整个系统的PQ(流阻)曲线与风机曲线进行拟合,以得到风机设计的工作点。为此,首先对集中式动力单元的风道模型结构进行简化,然后给出了有限元仿真的前处理过程及后处理计算结果,最后对所提出的方法进行试验验证,表明该方法的可行性与可靠性。所提出的有限元仿真方法与传统的理论计算方法相比,计算精度及计算效率均得以显著提高。

Centralized power unit has merits of integrating more variety of power units with higher power, but shortages like complex duct structure, diverse radiator type, and the difficulty of checking the working point of the cooling fan, therefore, the accuracy and efficiency of theoretical calculation could not be assured by using traditional methods. To solve problems mentioned above, the finite element simulation method was introduced. In this method, to find out accurate working points of fan, the model of cooling fan＇s duct structure was simplified firstly, which provided an easy path to PQ curve and fan curve of the whole system together. The processing of calculation and results attained by using finite element simulation were presented. Finally, the calculation and simulation method mentioned in this paper was verified by implementing experiment, and the results showed that the reliability and feasibility of this new method were significantly proved. It turned out that the finite element method was a more advanced way on improving calculation precision and efficiency by comparing with the traditional calculation method.