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Experimental investigation of secondary flow phenomena in a comressor stator cascade
Citation key beselt_diss_2016_en
Author Christian Beselt
Year 2016
ISBN 978-3-7418-5540-5
DOI 10.14279/depositonce-5620
Location Berlin
Month December
Editor DepositOnce - Institutional Repository for Research Data and Publications of TU Berlin
How Published Creative Commons Attribution 4.0 International CC BY 4.0
School Technische Universität Berlin
Abstract A key technology for the development of efficient and low-emission engines is the development of modern and efficient high pressure compressors with higher stage loading and improved efficiencies. A limiting factor for this is the decreasing stability which is accompanied with this development. A possibility to operate a compressor nevertheless in stable conditions is to keep a correspondingly large safety margin to the surge line, as done in the current design process of modern compressor. However, this method is contrary to the objective to develop compressors with higher efficiencies. Because mostly it is precisely near the surge line where the best efficiencies can be achieved. One way in which the objective of modern compressor designs can be achieved is to improve the detail knowledge of the secondary flows in a compressor passage. With this knowledge already in the development phase of a compressor the surge margin and unstable operating conditions can be verified and detected in advance. Furthermore, losses can be reduced and therefore the efficiency and the stage pressure ratio can be increased. Another aspect that can be taken into account with an improved knowledge of the secondary flow structures, is the increased understanding of the noise emitted by a compressor. Because the majority of the noise is generated by the interaction of unsteady fluid mechanics and aero-acoustic mechanisms. In recent experimental work on this subject, the authors focused primarily on a specific secondary flow structure and neglected the interaction of various structures with each other. Furthermore, the majority of studies was performed on linear cascades, leading to the fact, that some boundary conditions as they occur in real compressors are completely ignored. This thesis is now taking up the existing results in this subject and focuses on a detailed study of the secondary flow structures in a passage of a compressor stator. The questions, in what manner the individual secondary flow structures interact with each other and how these interactions change with varying blade loading are answered. In addition, a model is worked out based on detailed results.
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