多翼离心风机分组优化设计对风机盘管整机气动性能的 应度研究

Multi-blade centrifugal fans are often placed in air conditioners with complex workspace. The optimization characteristics of a single fan can't be effectively reflected in the whole machine. To improve the performance of the air conditioner, reveal the collaborative matching optimization effect between the dynamic and static components of the multi-blade centrifugal fan and the flow characteristics of the whole machine, this paper takes the air volume as the main parameter, uses the coefficient to characterize the responsiveness of the performance change of the fan coil unit caused by the performance change of a single fan. The effects of impeller, volute profile, volute tongue form and collector on the aerodynamic performance of a single fan and the fan coil unit are studied by using the grouping optimization design approach. The results show that the fish like blade with suction surface based on Bezier curve has the highest responsiveness. The flow separation on the suction surface of the blade is effectively restrained. The impact of air flow on the leading edge of the blade is reduced. The profile of bias flow volute and shallow tongue can significantly reduce the flow loss in the volute. However, the lack of static pressure resistance leads to poor responsiveness of the whole machine performance. The outer convex collector design effectively alleviates the reverse pressure gradient at the gap between the front disc of the impeller and the collector. Although it can improve the performance of a single fan, it destroys the air flow state at the inlet of the fan coil unit. The responsiveness of aerodynamic performance is negative. With the grouping optimization design used, the air volume and the efficiency are improved by 18% and 2.8% for a single fan, and by 11.2% and 0.83% for the fan coil unit respectively compared with the prototype.