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http://dx.doi.org/10.6108/KSPE.2012.16.1.001

A Numerical Analysis of Acoustic-Pressure Response of H2-Air Diffusion Flames with Application of Time-Lag Model  

Sohn, Chae-Hoon (세종대학교 기계항공우주공학부)
Lim, Jun-Seok (세종대학교 대학원 기계공학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.16, no.1, 2012 , pp. 1-8 More about this Journal
Abstract
Acoustic-pressure response of diluted hydrogen-air diffusion flames is investigated numerically by adopting a fully unsteady analysis of flame structures in low and high pressure regimes. As acoustic frequency increases, finite-rate chemistry is enhanced through a nonlinear accumulation of heat release rate for any pressure regime, leading to a high amplification index. Same numerical results are analyzed with application of a pressure-sensitive time lag model, and thereby, interaction index and time lag are calculated for each pressure regime. The interaction index has the largest value in each pressure regime at an acoustic frequency near 1000 Hz. In a high-pressure regime, flames are more unstable than in a low-pressure regime. The interaction index shows a good agreement with the amplification index.
Keywords
Acoustic-pressure Response; Hydrogen/Air Diffusion Flame; Time Lag Model; Interaction Index;
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  • Reference
1 Rayleigh, J. W. S., The Theory of Sound, Vol. II, Dover, 1945, p.226
2 Sohn, C. H., Chung, S. H., Kim, J. S., and Willams, F. A., "Acoustic Response of Droplet Flames to Pressrue Oscillations," AIAA Journal, Vol. 34, 1996, pp.1847-1854   DOI   ScienceOn
3 Sohn, C. H., Chung, S. H., Lee, S. R., and Kim, J. S., "Structure and Acoustic-Pressure Response of Hydrogen-Oxygen Diffusion Flames at High Pressure," Combustion and Flame, Vol. 115, 1998, pp.299-312   DOI   ScienceOn
4 Sohn, C. H., Chung, S. H., Kim, "Effect of Pressure on the Extinction, Acoustic Pressure Reponse, and NO Formation in Diluted Hydrogen-Air Diffusion Flames," Combustion and Flame, Vol. 121, 2000, pp.288-300   DOI   ScienceOn
5 Sohn, C. H., "Unsteady Analysis of Acoustic Pressure Response in N2 Diluted Flames," Combustion and Flame, Vol. 128, 2002, pp.111-120   DOI   ScienceOn
6 Pierringger, J., Sattelmayer, T., and Fassl. F., "Simulation of Combustion Instabilities in Liquid Rocket Engines with Acoustic Perturbation Equations," Journal of Propulsion and Power, Vol. 25, No. 5, 2009, pp.426-441
7 Linan, A. and Williams, F. A., "Ignition in an Unsteady Mixing Layer Subject to Strain and Variable Pressure," Combustion and Flame, Vol. 95, 1993, pp.31-46   DOI   ScienceOn
8 Smooke, M. D., 1982, "Solution of Burner Stabilized Premixed Laminar Flames by Boundary Value Method," Journal of Computational Physics, Vol. 48, pp.72-105   DOI   ScienceOn
9 Kee, R. J., Rupley, F. M., and Miller, J. A., CHEMKIN-II: A Fortran Chemical Kinetics Package for the Analysis of Gas-Phase Chemical Kinetics, Sandia National Laboratories Report, 1989, SAND89-8009
10 Kee, R. J., Warnatz, J., and Miller, J. A., A Fortran Computer Code Package for the Eveluation of Gas-Phase Viscosities, Conductivities, and Diffustion Coefficients, Sandia National Laboratories Report, 1983, SAND83-8209
11 Maas, U. and Warnatz, J., "Ignition Processes in Hydrogen-Oxygen Mixtures," Combustion and Flame, Vol. 74, 1988, pp.53-69   DOI   ScienceOn
12 Culick, F. E. C. and Yang, V., Liquid Propellant Rocket Combustion Instability, AIAA, Washinton DC, 1995, p.3