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The relation between losses and entry-flow conditions in short dump diffusers for combustors

Published online by Cambridge University Press:  04 July 2016

A. Klein
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Summary

An experimental correlation is presented between the losses and the inlet flow conditions in short dump diffusers for turbojet combustors. Cascades of compressor blades upstream of the diffuser were used to make the flow field at inlet similar to that in a real jet engine. The flow field was altered in two ways — by varying the distance between the cascades and the diffuser inlet plane and by changing the blade aspect ratio. The measurements show clearly that distortions in the radial direction affect the losses to a much larger extent than non-uniformities in the circumferential direction. In consequence, the performance can be correlated to a satisfactory degree of accuracy simply by using the radial blockage factor at inlet.

Type
Research Article
Information
The Aeronautical Journal , Volume 92 , Issue 920 , December 1988 , pp. 390 - 396
Copyright
Copyright © Royal Aeronautical Society 1988 

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References

1. Klein, A., Katheder, K. and Rohlffs, M. Experimental investigation of the performance of short annular combustor-dump diffusers. Proceedings of the 2nd International Symposium on Airbreathing Engines, Paper No 23, University of Sheffield, England, 1974.Google Scholar
2. Fishenden, C. R. and Stevens, S. J. The performance of annular combustor-dump diffusers. J Aircr 1977, 14, 60–67.Google Scholar
3. Wagner, W. B., Tanrikut, S. and Sokolowski, D. E. Performance of Annular Prediffuser-Combustor Systems. ASME-Paper 80-GT-15, 1980.Google Scholar
4. Sabla, P. E., Taylor, J. R. and Gauntner, D. J. Design and development of the combustor diffuser for NASA/GE energy efficient engine. J Energy 1982, 6, 275–282.Google Scholar
5. Adkins, R. C. and Yost, J. O. A Compact Diffuser System for Annular Combustors. ASME-Paper 83-GT-43, 1983.Google Scholar
6. Dubell, T. L., Russell, P. L. and Reilly, R. S. A Design Approach for a Practical Turbojet Engine Combustor Diffuser System. ASME-Paper 84-GT-104, 1984.Google Scholar
7. Hou, X.-C., Siao, T.-F. and Zhong, J.-P. Investigation and Experiment on a Short Dump-Diffuser of the Combustor. ASME-Paper 85-IGT-28, 1985.Google Scholar
8. Stevens, S. J., Nayak, U. S. L., Preston, J. F., Robinson, P. J. and Scrivener, C. T. J. The influence of compressor exit conditions on the performance of combustor-dump diffusers. Aircr 1978, 15, 482–488.Google Scholar
9. Klein, A., Pucher, P. and Rohlffs, M. The Effect of Blade-Wakes on the Performance of Short Dump-Diffuser Type Combustor Inlets. Trans ASME, J Fluids Eng 1980, 102, 236–241.Google Scholar
10. Stevens, S. I., Haragasma, S. P. and Wray, P. The influence of blade wakes on the performance of combustor pre-diffusers. J Aircr, 1984, 21, 641–648.Google Scholar
11. Stevens, S. I. and Wray, A. P. The Influence of Blade Wakes on the Performance of Outwardly Curved Combustor Pre-Diffusers. AIAA-Paper 85-1291, 1985.Google Scholar
12. Hill, P. G., Schaub, U. W. and Senoo, Y. Turbulent wakes in pressure gradients. Trans ASME, J Appl Mech, 1963, 85, 518–524.Google Scholar
13. Sovran, G. and Klomp, E. Experimentally determined optimum geometries for rectilinear diffusers with rectangular, conical or annular cross section. In: Sovran, G. (ed.) Fluid Mechanics of Internal Flow. Elsevier Publishing Company, Amsterdam, 1967.Google Scholar
14. Klein, A. Review: Effects of inlet conditions on conical-diffuser performance. Trans ASME, J Fluids Eng, 1981, 103, 250–257.Google Scholar
15. McMillan, F. A. Viscous effects on pitot tubes at low speeds. J R Aeronaut Soc, 1954, 58, 570–572.Google Scholar
16. Dewyatt, M. D. Analysis of Errors Introduced by Several Methods of Weighting Non-Uniform Duct Flows. NACA Technical Note 3400, 1955.Google Scholar