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现有设计体系中对于损失系数主要是由实验和经验来确定。通流气动设计需计入叶片槽道内的附面层堵塞，反映附面层堵塞影响的堵塞系数也是依经验给定。本文对多台风扇设计进行分析后，发现现有的设计体系中损失系数和附面层堵塞系数之间彼此孤立，且不够协调，而事实上，两者是紧密相关的，体现在物理上就是损失和开式分离流之间的关系。本文在分析现有设计体系模型的基础上，提出了一个新的工程模型，把两者关联了起来，并给出了算例分析，且从算例结果中可以看到现有设计体系中单转子效率远大于级效率的原因之一。
The loss coefficient in the existing design system is mainly determined by experiment and experience. Flow aerodynamic design to be included in the vane channel within the clogging, reflecting the impact of clogging congestion factor is given according to experience. After analyzing the design of multiple fans, we found that the loss coefficient and the clogging coefficient in the existing design system are isolated from each other and are not coordinated enough. In fact, the two are closely related to each other in terms of physics The relationship between loss and open separation flow. Based on the analysis of the existing design system model, this paper proposes a new engineering model, which connects the two and gives an example analysis. From the results of the example, we can see that the existing design system in the single Rotor efficiency is far greater than the efficiency of one of the reasons.