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Effects of Scalloping on the Mixing Mechanisms of Forced Mixers With Highly Swirling Core Flow

[+] Author Affiliations
Alex Wright, Zhijun Lei, Ali Mahallati

National Research Council of Canada, Ottawa, ON, Canada

Mark Cunningham

Pratt & Whitney Canada, Longueuil, PQ, Canada

Julio Militzer

Dalhousie University, Halifax, NS, Canada

Paper No. GT2012-70081, pp. 437-448; 12 pages
doi:10.1115/GT2012-70081
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4467-0
  • Copyright © 2012 by ASME and Her Majesty the Queen in Right of Canada

abstract

This paper presents a detailed experimental and computational investigation of the effects of scalloping on the mixing mechanisms of a scaled 12-lobe turbofan mixer. Scalloping was achieved by eliminating approximately 70% of the lobe sidewall area. Measurements were made downstream of the mixer in a co-annular wind tunnel and the simulations were carried out using an unstructured RANS solver, Numeca FINE/Hexa, with k-ω SST model. In the core flow, the swirl angle was varied from 0° to 30°. At high swirl angles, a three-dimensional separation bubble was formed on the lobe’s suction surface penetration region and resulted in the generation of a vortex at the lobe valley. The valley vortex quickly dissipated downstream. Most of the swirl was removed by the lobes, but scalloping allowed residual swirl to persist downstream of the mixer. The interaction of the swirling flow and the vortices resulted in improved mixing rates for the scalloped mixer. Inlet swirl up to 10° provided improved mixing rates, reduced pressure loss and thrust loss for both mixers. High inlet swirl resulted in improved mixing but produced higher pressure and thrust losses as compared to the zero swirl case. At high swirl, the scalloped mixer resulted in better mixing and lower pressure losses than the unscalloped mixer, but at the expense of reduced thrust.

Copyright © 2012 by ASME and Her Majesty the Queen in Right of Canada

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