新型四通道风机过滤单元的结构模拟及优化研究

A Study on the Structural Simulation and Optimization of the Novel Four-channel Fan Filter Unit

风机过滤单元(Fan Filter Unit,FFU)具有布局灵活、密封性佳、气流均匀等优点而在空气洁净领域得到了广泛的应用。FFU运行能耗与其箱体出风结构密切相关,本文采用CFD数值模拟方法对新型四通道FFU进行结构优化研究。首先采用多参考系坐标系模型建立了模拟方法,并通过与试验结果对比验证了模拟方法的准确性。其次,对比新型四通道FFU和传统结构FFU的内部流场和余压,结果显示四通道结构能够更有效地引导气流流动、改善流动分离现象,且在相同工况下余压较传统FFU高10~15%。最后,从进风罩厚度入手对四通道FFU箱体结构进行优化探索,研究结构细节参数设计与FFU整机性能的联系,结果表明将进风罩厚度增加至45 mm时该四通道FFU整机效率和空气动力效率最高。

The Fan Filter Unit(FFU)has been widely used in the field of air cleaning.The energy consumption of FFU is closely related to its air outlet structure.In the current study,CFD simulation method was used to optimize the structure of a novel four-channel FFU.Firstly,a multi-reference coordinate system model was used to establish a simulation method for the four-channel FFU,and the accuracy of the simulation method was verified by comparing with the experimental results.Secondly,the internal flow field and residual pressure of the four-channel FFU and the traditional FFU were compared.Results showed that the four-channel structure can guide the flow more effectively and improve the flow separation phenomenon,and the residual pressure was 10-15%higher than the traditional FFU under the same working conditions.Finally,the simulation optimization of the box structure of the four-channel FFU was investigated from the aspect of the thickness of the air inlet hood.Results showed that the highest overall efficiency and aerodynamic efficiency of the four-channel FFU can be reached when the thickness of the air inlet hood was increased to 45 mm.