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Numerical simulation of circulation control turbine cascade with Coanda jet and counter-flow blowing at high Mach numbers

Published online by Cambridge University Press:  19 June 2017

Y. Feng ,
Y. Song  and
F. Chen
Y. Feng*
Affiliation:
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
Y. Song
Affiliation:
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
F. Chen
Affiliation:
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, China
*
[email protected]
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Abstract

The performance of a circulation-control inlet guide vane that makes use of the Coanda effect was studied numerically in a high Mach number turbine cascade. The effect of different shapes (elliptic and circular) of the Coanda surface at the blade trailing edge was investigated by implementing both a Coanda jet and a counter-flow blowing. Under high subsonic flow conditions, with a total blowing ratio of 3% of the mainstream, the circulation control cascade can reach the same performance as the reference stator with a 13.5% reduction in the axial chord length, with minimal increase of the energy loss coefficient. The Coanda surfaces with small curvature are more efficient in entraining the mainstream flow, and they achieve better aerodynamic performance. The wall attachment of the Coanda jet is improved by employing counter-flow blowing, resulting in a slight increase of both the exit flow angle and the expansion ratio. Under supersonic flow conditions at the cascade exit, it is more difficult for the circulation control cascade to reach the appropriate flow turning due to a premature shock wave, which is absent in the original cascade until the very end of the suction surface.

Keywords

Coanda effectgas turbine cascadecirculation controlMach numberCoanda jetcounter-flow blowing
Type
Research Article
Information
The Aeronautical Journal , Volume 121 , Issue 1243 , September 2017 , pp. 1239 - 1260
Copyright
Copyright © Royal Aeronautical Society 2017 

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