基于叶素-动量理论的冷却风扇风量计算方法

摘要 将风力机经典叶素-动量理论应用于车用轴流式冷却风扇，建立了冷却风扇几何参数、风扇转速与风量的关系理论模型.该模型根据冷却风扇与风力机能量转换的差异，对经典叶素-动量在叶素载荷方向、出入口边界条件等方面进行了修正.随后，基于实验测量和计算流体力学的方法对风扇风量理论计算模型进行了验证.结果表明，风扇风量的理论计算方法不仅能够反映风量随风扇转速的变化规律，且具备较高的计算精度.在该模型中，理论算法与实验结果的平均相对误差为3.57%，与计算流体力学所得结果的平均相对误差为5.03%.
Abstract：A theoretical model that shows the correlation of geometry parameters of cooling fans， rotation speed and volume flow rate was established by using the classic blade element-momentum theory of wind turbines for the axial cooling fan of vehicles. This model revised the load direction on the blade element of blade element-momentum and the inlet and outlet boundary conditions and so on， based on the difference of energy transfer between cooling fans and wind turbines. Then， the experiment and simulation based on computational fluid mechanics were carried to test the precision of the theoretical model for the volume flow rate of cooling fans. The results showed that the theoretical computational method for volume flow rate of cooling fans not only reflects the change of volume flow rate with the rotation speed of fans， but also has high calculation precision. In the researched model， the average relative error between the theoretical calculation method and experiment is 3.57%， and the one between the theoretical calculation method and CFD is 5.03%.