Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-26T19:57:13.926Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Initial Conditions on Constant Pressure Mixing Between Two Turbulent Streams

Published online by Cambridge University Press:  07 June 2016

Sachidananda Kangovi
Sachidananda Kangovi*
Affiliation:
National Aeronautical Laboratory, Bangalore 560017
Get access

Summary

A study of the process of mixing and wake development has varied applications in wide ranging fields like jet ejectors, wake signatures, base pressure control, combustors, flow over cut-outs, jet noise and jet interactions. In real flows the wake is usually divided into two zones namely, the near field and the far field. The near field is usually controlled by initial conditions which involve two back-to-back boundary layers separating from the trailing edge of a solid surface. In the far field the flow becomes fully developed and assumes self similarity. The properties of fully developed far field have been well established but little is known about the near field. This paper describes the application of an integral analysis to study the effects of initial conditions like velocity ratio, initial boundary layer thickness, compressibility and temperature ratio on the development of near field of the turbulent mixing layer between two compressible, non-isoenergetic streams at constant pressure. Results include velocity and temperature profiles and the location of jet boundary line in the mixing layer. These results show the gradual approach of the mixing layer to self-preservation.

Type
Research Article
Information
Aeronautical Quarterly , Volume 34 , Issue 1 , February 1983 , pp. 61 - 75
Copyright
Copyright © Royal Aeronautical Society. 1983

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 Kline, S.J., Coles, D.E. and Harsha, P.T. Experiments in free shear flows - status and needs for the future. NASA SP-321, pp 655-662, 1972 Google Scholar
2 Korst, H.H. and Chow, W.L. Non-isoenergetic turbulent (Prt = 1.0) jet mixing between two compressible streams at constant pressure. NASA CR 419, 1966 Google Scholar
3 Chapman, A.J. Mixing characteristics of a free jet boundary with consideration of initial boundary layer configuration. Ph.D. Thesis, University of Illinois, 1953 Google Scholar
4 Lee, S.C. A study of the two-dimensional free turbulent mixing between converging streams with initial boundary layers. Ph.D. Thesis, University of Washington, 1966 Google Scholar
5 Kessler, T.J. Two-stream mixing with finite initial boundary layers. AIM Journal, Vol. 5, No. 2, pp 363-364, 1967 Google Scholar
6 Hill, W.G. and Page, R.H. Initial development of turbulent compressible free shear layers. Paper No. 68-WA/FE-21, Transaction of the ASME J. Basia Engg., 1968 Google Scholar
7 Görtler, H. Berechnung von Aufgaben der Freien Turbulenz auf Grund eines neuen Naherungsansatizes. ZAMM, Vol. 22, pp 244-254, 1942 CrossRefGoogle Scholar
8 Launder, B.E., Morse, A., Rodi, W. and Spalding, D.B. Prediction of free shear flows - a comparison of the performance of six turbulence models. NASA SP-321, pp 361-426, 1972 Google Scholar
9 Townsend, A.A. The Structure of Turbulent Shear Flow, 2nd Ed., Cambridge University Press, Cambridge, 1976 Google Scholar
10 Bradshaw, P. The effect of initial conditions on the development of a free shear layer. JFM, Vol. 26, Part 2, pp 225-236, 1966 Google Scholar
11 Korst, H.H., Chow, W.L., Hurt, R.F., White, R.A. and Addy, A.L. Analysis of free turbulent shear flows by numerical methods. NASA SP-321, pp 185-232 Google Scholar
12 Spencer, B.W. Statistical investigation of turbulent velocity and pressure fields in a two-stream mixing layer. Ph.D. Thesis, University of Illinois, 1970 Google Scholar
13 Sabin, C.M. An analytical and experimental study of the plane, incompressible, turbulent free shear layer with arbitrary velocity ratio and pressure gradient. J. of Basta Engg., Transactions of the ASME, pp 421-428, June 1965 CrossRefGoogle Scholar
14 Birch, S.F. and Eggers, J.M. A critical review of the experimental data for developed free turbulent shear layers. NASA SP-321, pp 11-40, 1972 Google Scholar
15 Brown, G. and Roshko, A. The effect of density difference on the turbulent mixing layer. AGARD CP-93, pp 23.1-23.12, 1972 Google Scholar
16 Foss, J.F. The effects of the laminar/turbulent boundary layer states on the development of a plane mixing layer. Symposium on Turbulent Shear Flow, The Penn. State University, pp 11.33-11.42, April 1977 Google Scholar
17 Bushnell, D.M. Calculation of turbulent free mixing-status and problems. NASA SP-321, pp 1-10, 1972 Google Scholar