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Published December 10, 1998 | Published
Journal Article Open

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


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.

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 difference 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 Scientific Research, Grant Nos. F49620-93-1-0338 and F49620-94-1-0353.

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