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Turbulent shear-layer mixing at high Reynolds numbers: effects of inflow conditions

Slessor, M. D. and Bond, C. L. and Dimotakis, P. E. (1998) Turbulent shear-layer mixing at high Reynolds numbers: effects of inflow conditions. Journal of Fluid Mechanics, 376 . pp. 115-138. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:20120119-070649934

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Abstract

We report on the results from a set of incompressible, shear-layer flow experiments, at high Reynolds number (Re_δ ≡ ρΔUδ_T(x)/μ ≃ 2×10^5), in which the inflow conditions of shear-layer formation were varied (δ_T is the temperature-rise thickness for chemically-reacting shear layers). Both inert and chemically-reacting flows were investigated, the latter employing the (H_2+NO)/F_2 chemical system in the kinetically-fast regime to measure molecular mixing. Inflow conditions were varied by perturbing each, or both, boundary layers on the splitter plate separating the two freestream flows, upstream of shear-layer formation. The results of the chemically-reacting ‘flip experiments’ reveal that seemingly small changes in inflow conditions can have a significant influence not only on the large-scale structure and shear-layer growth rate, as had been documented previously, but also on molecular mixing and chemical-product formation, far downstream of the inflow region.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1017/S0022112098002857DOIUNSPECIFIED
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=14579PublisherUNSPECIFIED
Additional Information:© 1998 Cambridge University Press. Received 9 February 1998 and in revised form 29 June 1998. Published online: 08 September 2000. We wish to acknowledge the contributions and expert assistance of Earl Dahl in support of the Supersonic Shear Layer facility and the execution of these experiments, and of Dan Lang with the data acquisition, computing, and networking environment that made these experiments possible. We would also like to acknowledge two of the referees who commented on the dierence in behaviour between the visual and temperature-rise thickness that led to the corresponding discussion in the final text. The work was funded by the Air-Breathing Propulsion program of the Air Force Office of Scientic Research, Grant Nos. F49620-93-1-0338 and F49620-94-1-0353.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research Air-Breathing Propulsion programF49620-93-1-0338
Air Force Office of Scientific Research Air-Breathing Propulsion programF49620-94-1-0353
Record Number:CaltechAUTHORS:20120119-070649934
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120119-070649934
Official Citation:Turbulent shear-layer mixing at high Reynolds numbers: effects of inflow conditions preview M. D. SLESSOR, C. L. BOND and P. E. DIMOTAKIS Journal of Fluid Mechanics / Volume 376 / pp 115-138
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28842
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Jan 2012 17:46
Last Modified:29 Mar 2014 04:08

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