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Characteristics of Planar Counter Current Shear Flow in Dump Geometry

[+] Author Affiliations
Prasad Kalghatgi, Sumanta Acharya

Louisiana State University, Baton Rouge, LA

Paul Strykowski, Matt Anderson

University of Minnesota, Minneapolis, MN

Paper No. IMECE2011-63312, pp. 109-119; 11 pages
doi:10.1115/IMECE2011-63312
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5487-7
  • Copyright © 2011 by ASME

abstract

Countercurrent shear can be used in engineering applications to control flow structure and mixing. In the present paper a planar countercurrent shear flow is studied numerically using Large Eddy Simulation. Mean flow characteristics at a primary-jet Reynolds number of 14700 are studied for three values of a key parameter, the secondary to primary jet mass flow ratio (s /p ), chosen to match reported measurements. The predicted flow results of time averaged flow field, Strouhal number and turbulence characteristics are compared with the experimentally available data. A change in instability modes is observed at mass flow ratios above ṁs /ṁp = 0.27 with more than 100% increase in the turbulence levels and distinct changes in spectral characteristics. Detailed spectral records along with landau modeling are used as evidence of existence of self excited global mode beyond a critical velocity ratio in the flow.

Copyright © 2011 by ASME
Topics: Shear flow , Geometry

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