Bleed-Induced Distortion in Axial Compressors

Autor:	T. Walker, Graham Pullan, S. D. Grimshaw
Přispěvatelé:	Apollo - University of Cambridge Repository
Rok vydání:	2015
Předmět:	geography Materials science geography.geographical_feature_category musculoskeletal neural and ocular physiology Mechanical Engineering Stall (fluid mechanics) Mechanics Bleed Inlet body regions Axial compressor Control theory Flow coefficient Total pressure Gas compressor Plenum chamber
Zdroj:	Journal of Turbomachinery. 137
ISSN:	1528-8900 0889-504X
DOI:	10.1115/1.4030809
Popis:	In this paper, the influence of non-uniform bleed extraction on the stability of an axial flow compressor is quantified. Non-uniformity can be caused by several geometric factors (for example, plenum chamber size or number of off-take ducts) and a range of configurations is examined experimentally in a single stage compressor. It is shown that non-uniform bleed leads to a circumferential distribution of flow coefficient and swirl angle at inlet to the downstream stage. The resultant distribution of rotor incidence causes stall to occur at a higher flow coefficient than if the same total bleed rate had been extracted uniformly around the circumference. The loss of operating range caused by the non-uniform inlet flow correlates with the peak sector-averaged bleed non-uniformity for all the bleed configurations tested. A connection is made between the analysis of non-uniform bleed extraction and the familiar “DCθ” criterion used to characterize inlet total pressure distortion.Copyright © 2014 by ASME
Databáze:	OpenAIRE
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