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http://dx.doi.org/10.3795/KSME-B.2005.29.8.963

A Experimental Study on the Instability of Combustion in a Dump Combustor with Respect to Fuel and Air Mixing and Flow Conditions  

Hong, Jung-Goo (한국과학기술원 대학원 기계공학과)
Lee, Min-Chul (한전 전력연구원)
Lee, Uen-Do (한국과학기술원 대학원 기계공학과)
Oh, Kwang-Chul (자동차부품연구원)
Shin, Hyun-Dong (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.8, 2005 , pp. 963-970 More about this Journal
Abstract
The combustion instability of turbulent flames is the most important problem of the gas turbine combustor. Thus improved understanding of mechanisms of combustion instability is necessary for the design and operation of gas turbine combustors. In this study, the cause of the combustion instability in a rearward-step dump combustor was investigated with respect to the fuel flow modulation; choked fuel flow, unchoked fuel flow and fully premixed mixture flow. We observed various types of combustion instabilities with respect to the change of equivalence ratio, fuel flow conditions and fuel injection location. Particularly in the unchoked fuel flow condition, it was found that the oscillation time of combustion instability is strongly related to the convection time of the fuel and that the pressure fluctuation in a lab-scale combustor is highly related to the vortex and the equivalence ratio fluctuations due to fuel flow modulation and unmixedness of the fuel and air.
Keywords
Combustion Instability; Heat Release Rate Fluctuation; Equivalence Ratio Fluctuation; Unmixedness; Vortex;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Kinsler, L. E., Frey, A. R., Coppens, A. B. and Sanders, J. V., 2000, 'Fundamentals of Acoustics,' John Wiley & Sons, Inc., 4th edition, pp. 130-133
2 Lieuwen, T. and Zinn, B. T., 1998, 'The Role of Equivalence Ratio Oscillations in Driving Combustion Instabilities in Low NOx Gas Turbines,' 27th Symposium on Combustion, pp. 1809-1816
3 Hong, J. G., Lee, M. C. and Shin, H. D., 2004, 'An Experimental Study on the Instability of Lean Premixed Turbulent Combustion Induced by Thermo-Acoustics,' Proceedings of the KSME 2004 Autumn Annual Meeting, pp. 1166-1171
4 Lee, M. C., Hong, J. G. and Shin, H. D., 2004, 'An Experimental Study in the Self-Excited Instabilities in Model Gas Turbine Combustor,' 29th Symposium KOSCO (The Korean Society of Combustion), pp. 197-205
5 Schadow, K. C., Gutmark, E., Parr, T. P., Parr, D. M., Wilson, K. J. and Crump, J. E., 1989, 'Large-Scale Coherent Structures as Drivers of Combustion Instability,' Combustion Science and Tech., Vol. 64, pp. 167-186   DOI
6 Mathur, M. L. and Maccallum, N. R. L., 1967, 'Swirling Air Jets Issuing from Vane Swirlers Part-1; Free Jets,' Journal inst. Fuel, May, 39, p. 214
7 Rayleigh, J.S.W., 1945, 'The Theory of Sound,' Vol. 2, p. 226
8 Seo, S. H., 2003, 'Combustion Instability Mechanism of a Lean Premixed Gas Turbine Combustor,' KSME International Journal, Vol. 17, No. 6, pp. 906-913
9 Huang, Y., Sung, H. G, Hsieh, S. Y. and Yang, V., 2003, 'Large-Eddy Simulation of Combustion Dynamics of Lean-Premixed Swirl-Stabilized Combustor,' Journal of Propulsion and Power, Vol. 19, No. 5, pp. 782-794   DOI   ScienceOn
10 Kulsheimer, C. and Buchner, H., 2002, 'Combustion Dynamics of Turbulent Swirling Flames,' Combustion and Flame, Vol. 131, pp. 70-84   DOI   ScienceOn
11 Lieuwen, T., Torres, H., Johnson, C. and Zinn, B. T., 2001, 'A Mechanism of Combustion Instability in Lean Premixed Gas Turbine Combustors,' ASME Vol. 123, pp. 182-189   DOI   ScienceOn
12 Venkataraman, K. K., Preston, L. H., Simons, D. W., Lee, B. J., Lee, J. G. and Santavicca, D. A., 1999, 'Mechanism of Combustion Instability in a Lean Premixed Dump Combustor,' Journal of Propulsion and Power, Vol. 15, No. 6, pp. 909-918   DOI   ScienceOn