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Show Acknowledgments This collaborative program was made possible by a travel grant by the Australian government's Department of Industry, Technology and Commerce. The authors would also like to acknowledge the partial support of the Gas Research Institute under Contract No. 5092-260-2596, with R. V. Serauskas serving as project monitor. The contribution of Adelaide Brighton Management Ltd. for the position of the first author is also gratefully acknowledged. The concepts expressed in this paper have been influenced and refined by discussions with colleagues at Adelaide University, who include Professor R. E. Luxton, Dr. D. K. Zhang and Messrs. S. J. Hill, G. J. R. Newbold, G. M. Schneider and N. L Smith. Finally, the cooperation and skill of the workshop staff, Messrs. R. Jager, A. Sherry and C. Price, is acknowledged in the crafting of the mechanically-rotated nozzles, as well as the contributions of L L Schaaf in the laboratory. REFERENCES Chen, R.-H. and Driscoll, 1. F. (1990). Nitric oxide levels of jet diffusion flames: effects of coaxial air and other mixing parameters. Twenty-Third Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 281-288. Claypole, T. C. and Syred, N. (1982). The stabilization of flames in swirl combustors. Journal of the Institute of Energy, 55, 14-19. Driscoll, I. F., Chen, R.-H. and Yoon, Y. (1992). Nitric oxide levels of turbulent diffusion flames: effects of residence time and Damkohler number. Combustion and Flame, 88, 37-49. Hill, S. I., Nathan, G. I. and Luxton, R. E. (1992). Precessing and axial flows following a sudden expansion in an axisymmetric nozzle. Eleventh Australasian Fluid Mechanics Conference, December 14-18, Hobart, Australia. Hori, M., Matsunaga, N., Malte, P. C., and Marinov, N. M. (1992). The effect of lowconcentration fuels on the conversion of nitric oxide to nitrogen dioxide. Twenty-Fourth Symposium (International) on Combustion, The Combustion Institu~ Pittsburgh, 909-916. Lovett, I. A. and Turns, S. R. (1993). The structure of pulsed turbulent nonpremixed jet flames. Combust. Sci. and Tech., 94, 193-217. Manias, C. G. and Nathan, G. I. (1993). The precessing jet gas burner - a low NOx burner providing process efficiency and product quality improvements. World Cement, March, 4-11. Manias, C. G. and Nathan, G. 1. (1994). Low NOx clinker production. World Cement, May. Mungal, M. G., Karasso, P. S. and Lozano, A., (1991). The visible structure of turbulent jet diffusion flames: large-scale organization and flame tip oscillation. Combust. Sci. and Tech., 76, 165-185. . Nathan, G. I. (1988). The enhanced mixing burner. PhD Thesis, Dept. Mech. Eng., The University of Adelaide. Nathan, G. I. and Luxton, R. E. (1992). Mixing enhancement by a self-exciting, asymmetric precessing flow-field. Transport Phenomena in Heat and Mass Transfer Vol. 2 (Reizes, I. 15 |