NDLI: Effects of Nonuniform Tip Clearance on Fan Performance and Flow Field

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chen, Yingxiu Hou, Anping Zhang, Mingming Li, Jianxiong Zhang, Simu
Copyright Year	2015
Abstract	Nonuniform tip clearance, caused by the deformation of the casing (casing ovalization), exists in all fans to some extent. However, description of the flow behavior with this kind of nonuniform clearance is seldom given in the open literature. In this paper, both steady and unsteady calculations are performed to study the influence of the nonuniform clearance on fan performance and flow field. The investigation method is based on three dimensional RANS equations, carried out by the ANSYS CFX fluid solver. A new factor τ, which is in the range of 0 to 1, is defined to represent the nonuniformity of the tip clearance. A series of numerical models with different tip clearance nonuniformities τ are investigated. In addition, the original, uniform tip clearance is also performed serving as a reference. The results indicate that the fan performance is mainly affected by two factors: the clearance nonuniformity τ and the average clearance level. There is a clear decreasing trend of the fan performance with increasing nonuniformity and average tip clearance level. The maximum clearance can contribute to the reduction of stall margin. Furthermore, the effects of nonuniform clearance on tip leakage vortex and aerodynamic force are also discussed in detail. The deformation of the casing can affect the pressure fluctuation and thus increase the amplitude of the aerodynamic force.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42133
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Leakage Fans Fluids Deformation Computer simulation Reynolds-averaged navier–stokes equations Vortices Clearances (engineering) Aerodynamics Fluid-dynamic forces Flow (dynamics) Pressure
Content Type	Text
Resource Type	Article

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