Characteristics of planar counter current shear flow in dump geometry

Prasad Kalghatgi, Sumanta Acharya, Paul J Strykowski, Matt J Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 (m s /m 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 m s /m p = 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 i n the flow.

Original languageEnglish (US)
Title of host publicationASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Pages109-119
Number of pages11
StatePublished - Dec 1 2011
EventASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States
Duration: Nov 11 2011Nov 17 2011

Publication series

NameASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Volume1

Other

OtherASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
CountryUnited States
CityDenver, CO
Period11/11/1111/17/11

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    Kalghatgi, P., Acharya, S., Strykowski, P. J., & Anderson, M. J. (2011). Characteristics of planar counter current shear flow in dump geometry. In ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 (pp. 109-119). (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; Vol. 1).