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Open AccessArticle

Linear Stability Prediction of Vortex Structures on High Pressure Turbine Blades

1
Engineering and Environment, University of Southampton, Southampton SO17 1BJ, UK
2
Department of Engineering, University of Cambridge, Cambridge CB2 1TN, UK
3
Department of Mechanical Engineering, University of Melbourne, Melbourne 3010, Australia
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Author to whom correspondence should be addressed.
This paper is an extended version of our paper in Proceedings of the European Turbomachinery ConferenceETC'12, 2017, Paper No. 185.
Academic Editor: Marcello Manna
Int. J. Turbomach. Propuls. Power 2017, 2(2), 8; https://doi.org/10.3390/ijtpp2020008
Received: 3 May 2017 / Revised: 16 May 2017 / Accepted: 22 May 2017 / Published: 26 May 2017
Velocity profiles are extracted from time- and span-averaged direct numerical simulation data, describing the flow over a high-pressure turbine vane linear cascade near engine-scale conditions with reduced inlet disturbance levels. Based on these velocity profiles, local as well as non-local linear stability analysis of the boundary-layer over the suction side of the vane is carried out in order to characterise a linearly unstable region close to the trailing edge. The largest growth rates are found for oblique modes, but those are only slightly more unstable than 2D modes, which describe the locations and frequencies of most unstable modes very well. The frequencies of the most unstable linear modes predict with good accuracy the predominant frequencies found in the direct numerical simulations (DNS) close to the trailing edge. View Full-Text
Keywords: stability analysis; boundary-layer; transition; turbine stability analysis; boundary-layer; transition; turbine
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Zauner, M.; Sandham, N.D.; Wheeler, A.P.S.; Sandberg, R.D. Linear Stability Prediction of Vortex Structures on High Pressure Turbine Blades . Int. J. Turbomach. Propuls. Power 2017, 2, 8.

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