Hostname: page-component-7b7567c8c-jswmv Total loading time: 0 Render date: 2026-11-15T21:51:33.921Z Has data issue: false hasContentIssue false
  • English
  • Français

Inverted-profile coaxial jet flows relevant to Astovl applications

Published online by Cambridge University Press:  04 July 2016

K. Knowles and
L. Kirkham
K. Knowles
Affiliation:
Aeromechanical Systems GroupCranfield University, RMCS Shrivenham, Swindon, UK
L. Kirkham
Affiliation:
Aeromechanical Systems GroupCranfield University, RMCS Shrivenham, Swindon, UK
Get accessRights & Permissions [Opens in a new window]

Abstract

An experimental investigation has been performed into the free jet and wall jet characteristics of high pressure ratio coaxial jets operating with inverted velocity profiles and impinging onto a ground plane. Pitot-static probes have been used to record free jet properties at various distances from the jet exit plane, and wall jet properties of the impinging jets at various radial positions. Jet properties such as velocity decay and spreading rates were calculated and compared to published literature. Wall jet development was investigated and recorded. Inner and outer nozzle pressure ratio (NPR) were altered to give a range of jet exit conditions. The results obtained showed variations in the wall jet properties as jet exit conditions were altered, but wall jet self-similarity was found and varying either nozzle height above the ground plane or NPR did not alter this. Free jet data showed large variations in behaviour with changes in NPR. The inverted profile jets behaved similarly to annular jets, showing similar characteristics. Inner jet pressurisation was observed for inverted profile jets and also significant acceleration of the flow from the inner, lower NPR, jet when this was subcritical.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 102 , Issue 1017 , September 1998, pp. 377 - 384
Copyright
Copyright © Royal Aeronautical Society 1998 

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.)

Article purchase

Temporarily unavailable

References

1. Flight International, 13 December 1995.Google Scholar
2. Tanna, H.K., Tester, B.J. and Lau, J.C. The noise and flow characteristics of inverted-profile coannular jets, NASA CR-158995, 1979.Google Scholar
3. Pao, S.P. A correlation of mixing noise from coannular jets with inverted flow profiles, NASA TP1301, 1979 Google Scholar
4. Cargill, A.M. and Duponchel, J.P. The noise characteristics of inverted velocity profile coannular jets, AIAA Paper No 77-1263, AIAA 4th Aeroacoustics Conference, Atlanta, Georgia, 3-5 October, 1977.Google Scholar
5. Ko, N.M.W. and Au, H. Spreading rate and reattachment of coaxial jets of high mean velocity ratio, Trans ASME, J Fluids Eng, 1982, 104, pp 400–401.Google Scholar
6. Tanna, H.K., Brown, W.H. and Tam, C.K.W. Shock associated noise of inverted profile coannular jets, Part 1: Experiments, J Sound and Vibration, 1985, 98, pp 95–113.Google Scholar
7. Tam, C.K.W. and Tanna, H.K. Shock associated noise of inverted profile coannular jets, Part 3: Shock structure and noise characteristics, J Sound and Vibration, 1985, 98, pp 127–145.Google Scholar
8. Ko, N.W.M. and Au, H. Coaxial jets of different mean velocity ratios, J Sound and Vibration, 1985, 100, Part 2, pp 211–232.Google Scholar
9. Au, H. and Ko, N.W.M. Coaxial jets of different mean velocity ratios Part 2, J Sound and Vibration, 1987, 116, Part 3, pp 427–443.Google Scholar
10. Dahm, W.J.A., Frieler, C.E. and Tryggvason, G. Vortex structure and dynamics in the near field of a coaxial jet, J Fluid Mech, 1992, 241, pp 371–402.Google Scholar
11. Wicker, R.B. and Eaton, J.K., Near field of a coaxial jet with and without axial excitation, AIAA J, 1994, 32, Part 3, pp 542–546.Google Scholar
12. Dosanjh, D.S., Matambo, T. and Gharib, M. Supersonic jet noise reduction by coaxial jets with coplanar and staggered exits, AIAA Paper, No 79-0672, AIAA 5th Aeroacoustics Conference, Seattle, Washington, 12-14 March 1979.Google Scholar
13. Kuhlman, J.M. Variation of entrainment in annular jets, AIAA J, 1987, 25, Part 3, pp 373–379.Google Scholar
14. Schwantes, E. The recirculating flow pattern of a Vtol lifting engine, NASA TT-F-14912, 1973.Google Scholar
15. Myszko, M. and Knowles, K. Development of a wall jet from an impinging round turbulent compressible jet, AIAA Paper 94-2327, 25th AIAA Fluid Dynamics Conference, Colorado Springs, Colorado, 20-23 June 1994.Google Scholar
16. Kuhlman, J.M. and Cavage, W.M. Jet ground vortex formation by annular jets, J Aircr, 31, Part 4, 1994, pp 794–801.Google Scholar
17. Massey, B.S. Mechanics of Fluids — 4th Edition Van Nostrand Reinhold, 1979, pp 405–407.Google Scholar
18. Taylor, G.J. Lift fan exhaust suppression CFD study, Private correspondence, 1994.Google Scholar
19. Curtis, P. Investigation into the behaviour of a single jet in free air and impinging perpendicularly on the ground, BAe Report, KAD-R-RES-3349, September 1987.Google Scholar
20. Bakke, P. An experimental investigation of a wall jet, J Fluid Mech, 2, (5), 1957, pp 476–472.Google Scholar
21. Glauert, M.B. The wall jet, J Fluid Mech, 1, Part 6, 1956, pp 625–643.Google Scholar
22. Hill, W.G.R. and Jenkins, R.C. Ground impingement of a fan jet exhaust plume, Grumman Aerospace, Internal Report, ADA054832 May 1978.Google Scholar
23. Miller, P. and Wilson, M. Wall jets created by single and twin high pressure jet impingement, Aeronaut J, 97, (963), March 1993, pp 87–99.Google Scholar
24. Hrycak, P., Lee, D., Gauntner, J. and Livingood, J. Experimental flow characteristics of a single turbulent jet impinging on a flat plate, NASA TN-D5690, 1970.Google Scholar
25. Poreh, M., Tsuei, Y.G. and Cermak, J.E. Investigation of a turbulent wall jet, J App Mech, June 1967, pp 457–463.Google Scholar