Hostname: page-component-7479d7b7d-767nl Total loading time: 0 Render date: 2024-07-11T15:22:05.088Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of Stream Turbulence on Free Shear Flows

Published online by Cambridge University Press:  07 June 2016

Rajni P. Patel
Rajni P. Patel*
Affiliation:
Faculty of Engineering, University of Nairobi
Get access

Summary

Recently attention has been given to the effects of the stream turbulence on the characteristics of the turbulent boundary layers and the turbulent shear flows. For the boundary layers considerable information on the effects of the stream turbulence is available but for the shear flows it is limited. This paper describes an experimental investigation for the effects of stream turbulence on the development of an asymmetric jet and a plane mixing layer. It is shown that the characteristics of these flows are considerably affected by the stream turbulence but for the measurements in the plane mixing layers at large downstream distances the influence of the stream turbulence is negligible provided the intensities are less than 0.6%. For the plane mixing layer the results show that the flow characteristics are not affected significantly by the initial boundary layers, the acoustic disturbances and the boundary conditions imposed by the end plates.

Type
Research Article
Information
Aeronautical Quarterly , Volume 29 , Issue 1 , February 1978 , pp. 33 - 43
Copyright
Copyright © Royal Aeronautical Society. 1978

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Schubauer, G.B. and Dryden, H.L. The Effects of Turbulence on the Drag of Flat Plates. NACA Report No.546, 1935.Google Scholar
2 Dryden, H.L. et al Measurement of Intensity and Scale of Wind Tunnel Turbulence and their Relation to the Critical Reynolds Numbers of Spheres. NACA Report No. 581, 1937.Google Scholar
3 Liepmann, H.W. and Fila, G.H. Investigation of Effects of Surface Temperature and Single Roughness Elements on Boundary Layer Transition. NACA Report No. 890, 1947.Google Scholar
4 Dryden, H.L. and Keuthe, A.M. Effect of Turbulence in Wind Tunnel Measurements. NACA Report No.342, 1929.Google Scholar
5 Kline, S.J. et al Preliminary Experimental Investigation of Effect of Free Stream Turbulence on Boundary Layer Growth. NASA, T.N. D.368, 1960.Google Scholar
6 Junkhan, G.H. and Serovy, G.K. Effects of Free Stream Turbulence and Pressure Gradient on Flat Plate Boundary Layer Velocity Profiles and on Heat Transfer. Trans. A.S.M.E., Series, C. Vol.89, 1967.Google Scholar
7 Charnay, G.; Comte-Bellot, G; and Mathieu, J. Development of a Turbulent Boundary Layer on a Flat Plate in an External Flow. AGARD CP 93, Paper No. 27, 1971.Google Scholar
8 Huffman, G.D.; Zimmerman, D.T.; Bennett, W.A. The Effect of Free Stream Turbulence Level and on Turbulent Boundary Layer Behaviour. AGARD AG164, pp.91–115, April 1972.Google Scholar
9 Green, J.E. On the Influence of Free Stream Turbulence on a Turbulent Boundary Layer, as it relates to Wind Tunnel Testing at Subsonic Speeds. AGARD-R-602 Paper No.4, pp. 4–1 - 4-8, April 1973.Google Scholar
10 McDonald, H; and Kereskovsky, J.P. Effect of Free Stream Turbulence on the Turbulent Boundary Layer. Int. J. of Heat and Mass Transfer, Vol.17, pp 705–716, 1974.Google Scholar
11 Evans, R.L. Free Stream Turbulence Effects on Turbulent Boundary Layer. A.R.C. C.P. No. 1282, 1974.Google Scholar
12 Meier, H.U. The Response of Turbulent Boundary Layers to Small Turbulence Levels in the External Free Stream. ICAS Paper No.76-05, Canada, October 1976.Google Scholar
13 Meier, H.U. The Effect of Velocity Fluctuations and Nonuniformities in the Free Stream on the Boundary Layer Development. Symposium on Turbulent Shear Flows, Pennsylvania, Vol.1, p.p. 10–35/40, April 1977.Google Scholar
14 Patel, R.P. A Study of Two-Dimensional Symmetric and Asymmetric Turbulent Shear Flows. Ph.D. Thesis, Dept. of Mechanical Engineering, McGill University.Google Scholar
15 Kilik, R.A.; Leithem, J.J.; and Weinstein, H. Effect of Free Stream Turbulence on Coaxial Mixing. NASA CR-1336, May 1969.Google Scholar
16 Peerless, S.J. Turbulent Mixing of Gas Streams: A theoretical and Experimental Investigation of the Effects of Free Stream Turbulence on the Development of the Plane Mixing Layer. Ph.D. Thesis, Imperial College, London, August 1972.Google Scholar
17 Vinogradov, Yu. V.; Cruzdev, V.N.; andTalantov, A.V. Effect of the Intensity of Turbulence Upon the Process of Mixing Slipstreams at a Different Ratio of Velocities. Wright-Patterson Air Force Base, Ohio, Rep. AD-778 798, April 1974, Translated from Teoriya i Praktika Szhiganiya Gaza, Nr.5, 1972, pp. 28–33.Google Scholar
18 Mohammadian, S.; Saiy, M.; and Peerless, S.J. Fluid Mixing with Unequal Free Stream Turbulence Intensities. ASME Paper 75-WA/FE-10, December 1975.Google Scholar
19 Bradshaw, P. Effect of Free Stream Turbulence on Turbulent Shear Layers. A.R.C.35648, Imperial College Aero Report 74 - 10, October 1974.Google Scholar
20 Patel, R.P. and Newman, B.G. Self-Preserving, Two-dimensional Turbulent Jets and Wall Jets in a Moving Stream. Mech. Eng. Res. Lab., Ae. Sec, Report No. Ae 5, McGill University, 1961.Google Scholar
21 Patel, R.P. Self-Preserving, Two-dimensional Turbulent Jets and Wall jets in a Moving Stream. M. Eng. Thesis, Mech. Eng. Dept. McGill University, 1962.Google Scholar
22 Gartshore, I.S. and Hawaleshka, O. The Design of a Two-Dimensional Blowing Slot and its Application to a Turbulent Wall Jet in Still Air. Mech.Eng. Res. Lab., Tech. Note 64-5, McGill University, 1964.Google Scholar
23 Gartshore, I.S. The Streamwise Development of Two- dimensional Wall Jets and Other Two-dimensional Turbulent Shear Flows. Ph.D. Thesis, Dept. of Mech. Eng. McGill University, 1965.Google Scholar
24 Wygnanski, I. and General Description and Calibration of the McGill 17in × 30in. Blower Cascade Wind Tunnel. Mech. Eng. Res. Lab., T.N. 63-7, McGill University, 1963.Google Scholar
25 Liepmann, H.W. and Laufer, J. Investigation of Free Turbulent Mixing. NACA TN. 1257, 1947.Google Scholar
26 Champagne, F.H. et al On the Two-Dimensional Mixing Region. J. Fluid Mech. Vol.74, part 2, 1976.Google Scholar
27 Patel, R.P. An Experimental Study of Plane Mixing Layer. AIAA Journal, Vol. 11, No. 1. 1973.Google Scholar
28 Wygnanski, I. and Fiedler, H.E. The Two-Dimensional Mixing Region. J. Fluid Mech., Vol. 41, Part 2, 1970.Google Scholar