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Experimental studies of a distorted turbulent spot in a three-dimensional flow

Published online by Cambridge University Press:  26 April 2006

M. Jahanmiri
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India Present address: Department of Mechanical and Aerospace Engineering, University of Science and Technology, Shahin Shahr City, Ishfahan, Iran.
A. Prabhu
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India
R. Narasimha
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India The Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India

Abstract

We report here on the results of a series of experiments carried out on a turbulent spot in a distorted duct to study the effects of a divergence with straight streamlines preceded by a short stretch of transverse streamline curvature, both in the absence of any pressure gradient. It is found that the distortion produces substantial asymmetry in the spot: the angles at which the spot cuts across the local streamlines are altered dramatically (in contradiction of a hypothesis commonly made in transition zone modelling), and the Tollmien–Schlichting waves that accompany the wing tips of the spot are much stronger on the outside of the bend than on the inside. However there is no strong effect on the internal structure of the spot and the eddies therein, or on such propagation characteristics as overall spread rate and the celerities of the leading and trailing edges. Both lateral streamline curvature and non-homogeneity of the laminar boundary layer into which the spot propagates are shown to be strong factors responsible for the observed asymmetry. It is concluded that these factors produce chiefly a geometric distortion of the coherent structure in the spot, but do not otherwise affect its dynamics in any significant way.

Type
Research Article
Copyright
© 1996 Cambridge University Press

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References

Ahmed, A., Wentz, W. H. & Nyenhuis, R. 1989 J. Aircraft 26, 979985.
Antonia, R. A., Chambers, A. J., Sokolov, M. & Van Atta, C. W., 1981 J. Fluid Mech. 108, 317343.
Arnal, D. & Juillen, J. C. 1977 Reherche Aerospatiale 1977–2, 147166.
Barenblatt, G. I. 1992 J. Fluid Mech. 248, 513520.
Cantwell, B., Coles, D. & Dimotakis, P. 1978 J. Fluid Mech. 87, 641672.
Chambers, F. W. & Thomas, A. S. W. 1983 Phys. Fluids, 26, 11601162.
Chen, K. K. & Thyson, N. A. 1971 AIAA J. 9, 821825.
Clark, J. P., Jones, T. V. & Lagraffe, J. E. 1993 J. Engng Maths 28, 119.
Coles, D. E. 1981 Proc. Ind. Acad. Sci. (ES) 4, 111127.
Emmons, H. W. 1951 J. Aero. Sci. 18, 490498.
Emmons, H. W. & Bryson, A. E. 1952 Proc. 1st US Natl Congr. on Appl. Mech., pp. 852868.
Gad-el-Hak, M., Blackwelder, R. F. & Riley, J. J. 1981 J. Fluid Mech. 110, 7395.
Gostelow, J. P. & Blunden, A. R. 1992 Proc. ASME Gas Turbine Conference, Cologne, June 1992.
Gostelow, J. P., Hong, H. & Sheppeard, M. A. 1992 Proc. ISROMAC 4 Honolulu, Hawaii.
Gutmark, E. & Blackwelder, R. F. 1987 Exps. Fluids 5, 217229.
Hedley, T. B. & Keffer, J. F. 1974. J. Fluid Mech. 64, 625644.
Itsweire, E. C. & Van atta, C. W. 1984 J Fluid Mech. 148, 319348.
Jahanmiri, M., Prabhu, A. & Narasimha, R. 1995 Laminar-Turbulent Transition, Proc. IUTAM Symp., Sendai. Japan Sept. 1994 (ed. R. Kobayashi). Springer.
Jahanmiri, M., Rudra Kumar, S. & Prabhu, A. 1991 Fluid. Mech. Rep. 91 FM 13. Dept. Aero. Engng., Ind. Inst. Sci. Bangalore.
Katz, Y., Seifert, A. & Wygnanski, I. 1990 J. Fluid Mech. 221, 122.
Kohama, Y. 1988 In Turbulence Management and Relaminarization, Proc. IUTAM Symp., Bangalore 1987 (ed. H. W. Liepmann & R. Narasimha). Springer, Berlin.
Kovasznay, L. S. G., Kibens, V. & Blackwelder, R. F. 1970 J. Fluid Mech. 41, 283325.
Kowsky, P. N. & Bippes, H. 1988 Phys. Fluids. 31, 786795.
Kuan, C. L. & Wang, T. 1990 Expl Therm. Fluid. Sci. 3, 157173.
Narasimha, R. 1985 Prog. Aero. Sci. 22, 2980.
Narasimha, R., Devasia, K. J., Gururani, G. & Badrinarayanan, M. A. 1984a Exps. Fluids 2, 171176.
Narasimha, R., Subramanian, C. & Badrinarayanan, M. A. 1984b AIAA J. 22, 837839.
Perry, A. E., Lim, T. T. & Teh, E. W. 1981 J. Fluid Mech. 104, 387407.
Poll, D. I. A. 1985 J. Fluid Mech. 150, 329356.
Prabhu, A. & Rao, B. N. S. 1981 Fluid Mech. Rep. 81 FM 10. Dept. Aero. Engng, Ind. Inst. Sci., Bangalore.
Ramesh, O. N., Dey, J. & Prabhu, A. 1993 AIAA J. 32, 209210.
Riley, J. J. & Gad-el-Hak, M. 1985 The dynamics of turbulent spots. In Frontiers in Fluid Mechanics (ed. S. H. Davis & J. L. Lumley), pp. 123155. Springer.
Saddoughi, S. G. & Joubert, P. N. 1991 J. Fluid Mech. 229, 173204.
Schlichting, H. 1960 Boundary Layer Theory. McGraw Hill.
Schubauer, G. B. & Klebanoff, P. S. 1955 NACA Tech. Note 3489.
Smith, F. T. 1994 (ed.) J. Engng Maths 28, 191.
Van Atta, C. W. & Helland, K. N. 1980 J. Fluid Mech. 100, 243255.
Wygnanski, I. 1981 In The Role of Coherent Structures in Modelling Turbulence and Mixing, Proc. Intl Conf. Madrid 1980 (ed. J. Jimenez). Springer.
Wygnanski, I., Haritonidis, J. H. & Kaplan, R. E. 1979 J. Fluid Mech. 92, 505528.
Wygnanski, I, Sokolov, M. & Friedman, D. 1976 J. Fluid Mech. 78, 785819 (referred to herein as WSF).
Wygnanski, I, Zilberman, M. & Haritonidis, J. H. 1982 J. Fluid Mech. 123, 6990.
Zilberman, M., Wygnanski, I. & Kaplan, R. E. 1977 Phys. Fluids Suppl. 20, S258S271.
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