Computational Analysis of Unsteady Tip Leakage Flow in an Isolated Axial Compressor Rotor Blade

Content Provider	Semantic Scholar
Author	Abbasi, Sarallah Zenouz, Reza Taghavi
Copyright Year	2017
Abstract	Unsteady flow structure, particularly in blade tip clearance region of turbomachines, is one of the main resources of blade vibration, undesirable noise and loss which may eventuate to severe rotating stall and surge. Therefore, analysis of flow behavior in tip clearance region is more significant. In this paper, the unsteadiness caused by blade row tip leakage flow in an axial compressor, is investigated. Analyses are based on flow simulation utilizing computational fluid dynamics technique. For investigation and discussion, two different circumstances at design point and near stall condition are considered. Tip leakage flow frequency spectrum was studied through surveying instantaneous static pressure signals imposed on blades surfaces. Frequency spectrum results showed existence of some pressure peaks at near stall conditions. In this case, interaction between main inflow and tip leakage flow lead to unsteadiness. By occurrence of unsteadiness, tip leakage vortex flow starts to fluctuate at a frequency about the blade passing frequency. However, at design condition, flow is more affected by the main inflow instead of the tip leakage flow. Review History: Received: 4 December 2015 Revised: 21 February 2016 Accepted: 11 April 2016 Available Online: 15 August 2016
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Alternate Webpage(s)	https://mej.aut.ac.ir/?_action=showPDF&_ob=449b862e8b765b019ad4afd6e6ed2027&article=737&fileName=full_text.pdf&sc=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article