Abstract
The current paper mainly focuses on finding a more appropriate way to enhance the fan performance at off-design conditions. The centrifugal fan (CF) based on flap-adjustment (FA) has been investigated through theoretical, experimental, and finite element methods. To obtain a more predominant performance of CF from the different adjustments, we carried out a comparative analysis on FA and leading-adjustment (LA) in aerodynamic performances, which included the adjusted angle of blades, total pressure, efficiency, system-efficiency, adjustment-efficiency, and energy-saving rate. The contribution of this paper is the integrated performance curve of the CF. Finally, the results showed that the effects of FA and LA on economic performance and energy savings of the fan varied with the blade angles. Furthermore, FA was feasible, which is more sensitive than LA. Moreover, the CF with FA offered a more extended flow-range of high economic characteristic in comparison with LA. Finally, when the operation flow-range extends, energy-saving rate of the fan with FA would have improvement.
Highlights
As important equipment for many industries, the centrifugal fan (CF) has wide applications and it accounts for a large amount of primary energy consumption [1]
Equations (1) and (2), it indicates that the change of the flap angle causes the change of the blade setting angle and the maximum total pressure would be higher with the increase of the flap angles, that could be observed from Figures 6 and 7
This paper presented a new adjustment in the CF operation at the off-design condition that is FA
Summary
As important equipment for many industries, the centrifugal fan (CF) has wide applications and it accounts for a large amount of primary energy consumption [1]. The fan adjustment to pursue better performance in the progress of its operation must be investigated, such as outlet-angle (OA) adjustment [6] and inlet guide vanes (IGVs) adjustment [7], which is called the leading-adjustment (LA) in this paper. The inlet vanes lead to a whirl to the entering gas, so that the gas enters the CF or pump system in a fixed rotation direction. Due to IGVs, the CF operates with stable enough characteristic pressure curves, which do not tend to surge because of the turbulence created by the vanes in the inlet position in running condition [8]. By installing a guide vane of several sheets at the suction cascade inlet of the cross-flow fan and optimizing the angle, results in [9] showed that the high pressure was obtained.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
