Skip to main content
    • Aa
    • Aa

Large-scale structure and entrainment in the supersonic mixing layer

  • N. T. Clemens (a1) (a2) and M. G. Mungal (a1)

Experiments were conducted in a two-stream planar mixing layer at convective Mach numbers, Mc, of 0.28, 0.42, 0.50, 0.62 and 0.79. Planar laser Mie scattering (PLMS) from a condensed alcohol fog and planar laser-induced fluorescence (PLIF) of nitric oxide were used for flow visualization in the side, plan and end views. The PLIF signals were also used to characterize the turbulent mixture fraction fluctuations.

Visualizations using PLMS indicate a transition in the turbulent structure from quasi-two-dimensionality at low convective Mach number, to more random three-dimensionality for $M_c\geqslant 0.62$. A transition is also observed in the core and braid regions of the spanwise rollers as the convective Mach number increases from 0.28 to 0.62. A change in the entrainment mechanism with increasing compressibility is also indicated by signal intensity profiles and perspective views of the PLMS and PLIF images. These show that at Mc = 0.28 the instantaneous mixture fraction field typically exhibits a gradient in the streamwise direction, but is more uniform in the cross-stream direction. At Mc = 0.62 and 0.79, however, the mixture fraction field is more streamwise uniform and with a gradient in the cross-stream direction. This change in the composition of the structures is indicative of different entrainment motions at the different compressibility conditions. The statistical results are consistent with the qualitative observations and suggest that compressibility acts to reduce the magnitude of the mixture fraction fluctuations, particularly on the high-speed edge of the layer.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

Batt, R. G. 1977 Turbulent mixing of passive and chemically reacting species in a low-speed shear layer. J. Fluid Mech. 82, 5395.

Bernal, L. P. & Roshko, A. 1986 Streamwise vortex structure in plane mixing layers. J. Fluid Mech. 170, 499525.

Bogdanoff, D. W.1983Compressibility effects in turbulent shear layers. AIAA J.21, 926927.

Breidenthal, R. 1981 Structure in turbulent mixing layers and wakes using a chemical reaction. J. Fluid Mech. 109, 124.

Breidenthal, R.1992Sonic eddy – A model for compressible turbulence. AIAA J.30, 101104.

Broadwell, J. E. & Breidenthal, R. E. 1982 A simple model of mixing and chemical reaction in a turbulent shear layer. J. Fluid Mech. 125, 397410.

Browand, F. K. & Latigo, B. O.1979Growth of the two-dimensional mixing layer from a turbulent and nonturbulent boundary layer. Phys. Fluids22, 10111019.

Browand, F. K. & Troutt, T. R. 1985 The turbulent mixing layer: Geometry of the large vortices. J. Fluid Mech. 158, 489509.

Brown, G. L. & Roshko, A. 1974 On density effects and large structure in turbulent mixing layers. J. Fluid Mech. 64, 775816.

Chandrsuda, C., Mehta, R. D., Weir, A. D. & Bradshaw, P. 1978 Effect of free-stream turbulence on large structure in turbulent mixing layers. J. Fluid Mech. 85, 693704.

Chinzei, N., Masuya, G., Komuro, T., Murakami, A. & Kudou, K.1986Spreading of two-stream supersonic mixing layers. Phys. Fluids29, 13451347.

Clemens, N. T. & Mungal, M. G.1992aTwo- and three-dimensional effects in the supersonic mixing layer. AIAA J.30, 973981.

Clemens, N. T. & Mungal, M. G.1992bEffects of sidewall disturbances on the supersonic mixing layer. J. Propulsion Power8, 249251.

Dowling, D. R. & Dimotakis, P. E. 1900 Similarity of the concentration field of gas-phase turbulent jets. J. Fluid Mech. 218, 109142.

Elliott, G. S. & Samimy, M.1990Compressibility effects in free shear layers. Phys. Fluids A 2, 12311240.

Elliott, G. S., Samimy, M. & Arnette, S. A.1993Study of compressible mixing layers with filtered Rayleigh scattering based visualizations. AIAA J.30, 25672569.

Fiedler, H. E.1974Transport of heat across a plane turbulent mixing layer. Adv. Geophys.18, 93109.

Fourguette, D. C., Mungal, M. G. & Dibble, R. W.1990Time evolution of the shear layer of a supersonic axisymmetric jet at matched conditions. AIAA J.29, 11231130.

Goebel, S. G. & Dutton, J. C.1991Experimental study of compressible turbulent mixing layers. AIAA J.29, 538546.

Hanson, R. K., Seitzman, J. M. & Paul, P. H.1990Planar laser-induced fluorescence imaging of combustion gases. Appl. Phys. B 50, 441454.

Jackson, T. L. & Grosch, C. E. 1989 Inviscid spatial stability of a compressible mixing layer. J. Fluid Mech. 208, 609637.

Masutani, S. M. & Bowman, C. T. 1986 The structure of a chemically reacting plane mixing layer. J. Fluid Mech. 172, 93126.

Maydew, R. C. & Reed, J. F.1963Turbulent mixing of compressible free jets. AIAA J.1, 14431444.

McGregor, I. 1961 The vapor screen method of flow visualization. J. Fluid Mech. 11, 481511.

McIntyre, S. S. & Settles, G. S.1991Optical experiments on axisymmetric compressible turbulent mixing layer. AIAA Paper 91-0623.

Miller, M. F., Island, T. C., Seitzman, J. M., Bowman, C. T., Mungal, M. G. & Hanson, R. K.1993Compressibility effects in a reacting mixing layer. AIAA Paper 93-1771.

Mungal, M. G. & Dimotakis, P. E. 1984 Mixing and combustion with low heat release in a turbulent shear layer. J. Fluid Mech. 148, 349382.

Mungal, M. G. & Frieler, C. E.1988The effects of Damkohler number in a turbulent shear layer. Combust. Flame71, 2334.

Papamoschou, D.1991Structure of the compressible turbulent shear layer. AIAA J.29, 680681.

Papamoschou, D. & Roshko, A. 1988 The compressible turbulent shear layer: an experimental study. J. Fluid Mech. 197, 453477.

Petullo, S. P. & Dolling, D. S.1993Large-scale structure orientation in a compressible turbulent shear layer. AIAA Paper 93-0545.

Ragab, S. A. & Wu, J. L.1989Linear instabilities in two-dimensional compressible mixing layers. Phys. Fluids A 1, 957966.

Rajagopalan, S. & Antonia, R. A. 1981 Properties of the large structure in a slightly heated turbulent mixing layer of a plane jet. J. Fluid Mech. 105, 261281.

Samimy, M. & Lele, S. K.1991Motion of particles with inertia in a compressible free shear layer. Phys. Fluids A 3, 19151923.

Samimy, M., Reeder, M. F. & Elliott, G. S.1992Compressibility effects on large structures in free shear flows. Phys. Fluids A 4, 12511258.

Sandham, N. D. & Reynolds, W. C. 1991 Three-dimensional simulations of large-eddies in the compressible mixing layer. J. Fluid Mech. 224, 133158.

Sunyach, M. & Mathieu, J.1969Mixing zone of a two-dimensional jet. Intl J. Heat Mass Transfer12, 16791697.

Wegener, P. P., Clumpner, J. A. & Wu, B. J. C.1972Homogeneous nucleation and growth of ethanol drops in supersonic flow. Phys. Fluids15, 18691876.

Wygnanski, I., Oster, D., Fiedler, H. & Dziomba, B. 1979 On the perseverance of a quasi-two-dimensional eddy-structure in a turbulent mixing layer. J. Fluid Mech. 93, 325335.

Zhuang, M., Dimotakis, P. E. & Kubota, T.1900The effect of walls on a spatially growing supersonic shear layer. Phys. Fluids A 2, 599608.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Full text views

Total number of HTML views: 0
Total number of PDF views: 100 *
Loading metrics...

Abstract views

Total abstract views: 160 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 21st September 2017. This data will be updated every 24 hours.