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Mitigation of Destructive Effects of Tip Vortex in Ducted Axial Non-Twisted Fans by Utilization of Different Arrangement of Fanlets

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2012

Key Words:

Author Name
Abstract (2. Language): 
On the circumstances that ducted axial fans are used abundantly in propulsion, air conditioning, power generating and other systems, studying their performances to find ways to optimize them is of immense importance. To minimize destructive effects of tip vortices on fan performance, in this study, effects of using different configurations of fanlets have been investigated. Therefore, using Blade Element (B.E.) theory, a basic blade was designed to generate 2, 4, and 6-blade models. Then each model was separately investigated in three different configurations of: up-let, down-let and fresh i.e. without fanlet, resulting in 9 final models. K-e turbulent modeling was used to evaluate performance of the models. Besides, Horizontal Element Separation (H.E.S.) was used as a post processing means to gain data of aerodynamic forces acting on the elements of blade to plot distribution profiles along the span. Convergence of C.F.D. outcome with results of blade element method for a two-blade fresh model proved C.F.D. method usage validity. Concluding results obviously demonstrate that performance of an axial aerial fan could be enhanced by maximum 3.6 percent using fanlets. Studying and analyzing distribution profiles reveals why and how fanlet affects performance of axial fans.
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  • 9
100-105
  • English

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