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Active feedback control of stall in an axial flow fan under dynamic inflow distortion

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Title Active feedback control of stall in an axial flow fan under dynamic inflow distortion
 
Creator SALUNKHE, PB
JOSEPH, J
PRADEEP, AM
 
Subject ROTATING STALL
INLET DISTORTION
WAVELET ANALYSIS
COMPRESSOR
INCEPTION
Rotating stall
Dynamic distortion
Active flow control
Stall inception
 
Description This work proposes an active feedback control strategy using cross-correlation technique in a single stage axial flow fan operating under dynamic inflow distortion. Experiments were carried out under dynamic inflow distortion at the design speed with only three sensors and actuators, each. The stall inception mechanism studies under dynamic inflow distortion were carried out using 1-D continuous Morlet wavelet transform. It was observed that stall inception under co- (in the same direction of rotor rotation) and counter-rotating (in the opposite direction of rotor rotation) inflow distortion occurred through long and short length-scale disturbances, respectively. The knowledge of the nature of instabilities under dynamic inflow distortion was used to set the threshold of the correlation coefficient. It was observed that the active feedback control strategy resulted in a stall onset delay of 125 (similar or equal to 3.125 s) and 65 (similar or equal to 1.625 s) rotor revolutions under co- and counter-rotating inflow distortions, respectively. The highest delay under co-rotating inflow distortion was attributed to the substantially higher stall warning time as compared to counter-rotating inflow distortion. (C) 2011 Elsevier Inc. All rights reserved.
 
Publisher ELSEVIER SCIENCE INC
 
Date 2012-06-26T06:43:53Z
2012-06-26T06:43:53Z
2011
 
Type Article
 
Identifier EXPERIMENTAL THERMAL AND FLUID SCIENCE,35(6)1135-1142
0894-1777
http://dx.doi.org/10.1016/j.expthermflusci.2011.03.008
http://dspace.library.iitb.ac.in/jspui/handle/100/14068
 
Language English