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Int. J. Turbomach. Propuls. Power 2016, 1(1), 3; doi:10.3390/ijtpp1010003

Aerodynamic Performance of an Ultra-Low Aspect Ratio Centripetal Turbine Stator

1
Jacques Chauvin Laboratory, von Karman Institute for Fluid Dynamics, Waterloosesteenweg 72, B-1640 Sint-Genesius-Rode, Belgium
2
Safran Aircraft Engines, Rond Point René Ravaud–Réau, 77550 Moissy-Cramayel, France
This paper is an extended version of our paper published in Proceedings of the European Turbomachinery Conference ETC’11, 2015, Paper No. 18.
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Manna
Received: 26 August 2016 / Revised: 20 October 2016 / Accepted: 18 November 2016 / Published: 26 November 2016
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Abstract

An extensive measurement campaign was carried out at the von Karman Institute for Fluid Dynamics to assess the aerodynamic performance of an ultra-low aspect ratio centripetal turbine stator. The test section consisted of 18 periodic sectors of two blade passages each, tested at transonic conditions in a blow-down facility. Particle image velocimetry (2D-PIV) measurements were performed in the trailing edge area at blade mid-height. Further downstream, 16 micro virtual 3-hole pressure probes were used to measure the aerodynamic performance at about 44% of the radial chord, downstream of the trailing edge. Results describe a highly swirling flow-field characterized by a very large tangential velocity component increasing at smaller radii. The radial component decreased instead to compensate for an opening of the test section closer to its center, therefore enhancing the tangential nature of the generated flow field. Adjacent blades showed asymmetric wakes as an effect of the particular design of the nozzle. The performance analysis exhibited very high loss coefficients (always higher than 12%) which have to be related to the extremely small aspect ratio of the cascade. View Full-Text
Keywords: ultra-low aspect ratio; centripetal turbine stator; transonic; micro pressure probe; virtual 3-hole; particle image velocimetry; aerodynamic performance ultra-low aspect ratio; centripetal turbine stator; transonic; micro pressure probe; virtual 3-hole; particle image velocimetry; aerodynamic performance
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This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives License (CC BY-NC-ND) (CC BY-NC-ND).

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MDPI and ACS Style

Fontaneto, F.; Arts, T.; Simon, M.; Picot, P. Aerodynamic Performance of an Ultra-Low Aspect Ratio Centripetal Turbine Stator. Int. J. Turbomach. Propuls. Power 2016, 1, 3.

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Int. J. Turbomach. Propuls. Power EISSN 2504-186X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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