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A method for calculating inlet distortion effects on stability of split-flow fans

Published online by Cambridge University Press:  03 February 2016

H. Khaleghi ,
G. Doulgeris ,
M. Boroomand ,
P. Pilidis  and
A. M. Tousi
H. Khaleghi
Affiliation:
khaleghi@aut.ac.ir, Aerospace Engineering Department, Amirkabir University of Technology, Tehran, Iran
G. Doulgeris
Affiliation:
p.pilidis@cranfield.ac.uk, Department of Power and Propulsion, School of Engineering, Cranfield University, Cranfield, UK
M. Boroomand
Affiliation:
khaleghi@aut.ac.ir, Aerospace Engineering Department, Amirkabir University of Technology, Tehran, Iran
P. Pilidis
Affiliation:
p.pilidis@cranfield.ac.uk, Department of Power and Propulsion, School of Engineering, Cranfield University, Cranfield, UK
A. M. Tousi
Affiliation:
khaleghi@aut.ac.ir, Aerospace Engineering Department, Amirkabir University of Technology, Tehran, Iran
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Extract

This paper presents a methodology for calculating the operability and performance of split-flow fans with inlet distortion. A one-dimensional stage-by-stage model has been developed to include parallel compressor theory. The model is capable of providing a detailed definition of the circumferential and radial flow fields. The low-pressure fan is divided to three radial divisions, near-hub, near-tip, and mid-span. The characteristics of each radial segment are calculated by using fan radial profiles. The stable and unstable operations of a split-flow fan, with and without inlet distortion, have been investigated in this study. For the clean inflow surge was triggered by the core compressor, whereas the fan spoiled sector was found to cause the compression system to surge for the distorted case.

Type
Research Article
Information
The Aeronautical Journal , Volume 113 , Issue 1147 , September 2009 , pp. 591 - 598
Copyright
Copyright © Royal Aeronautical Society 2009 

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