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Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage
Joint Authors
Pradeep, A. M.
Dejene Toge, Tegegn
Source
International Journal of Rotating Machinery
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-11-04
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
The present paper is an attempt in understanding the stall inception mechanism in a low speed, contra rotating axial flow fan stage, using wavelet transforms.
The rotors used in this study have relatively large tip gap (about 3% of the blade span) and aspect ratio of 3.
The study was carried out near stall and at stall mass flow conditions for different speed ratios of rotor-2 to rotor-1.
Unsteady pressure data from the casing wall mounted sensors are used to understand the stall inception mechanism.
The wavelet transform clearly indicates that stall inception occurs mainly through long length scale disturbances for both rotors.
It also reveals that short length disturbances occur simultaneously or intermittently in the case of rotor-1.
The analysis shows the presence of a strong modal disturbance with 25–80% of the rotor frequency in the case of rotor-1 at the stall mass flow for all the speed combinations studied.
The most interesting thing observed in the present study is that the frequency amplitude of the disturbance level is very small for both rotors.
American Psychological Association (APA)
Dejene Toge, Tegegn& Pradeep, A. M.. 2015. Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage. International Journal of Rotating Machinery،Vol. 2015, no. 2015, pp.1-14.
https://search.emarefa.net/detail/BIM-1066936
Modern Language Association (MLA)
Dejene Toge, Tegegn& Pradeep, A. M.. Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage. International Journal of Rotating Machinery No. 2015 (2015), pp.1-14.
https://search.emarefa.net/detail/BIM-1066936
American Medical Association (AMA)
Dejene Toge, Tegegn& Pradeep, A. M.. Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage. International Journal of Rotating Machinery. 2015. Vol. 2015, no. 2015, pp.1-14.
https://search.emarefa.net/detail/BIM-1066936
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1066936