Investigation of Self-Excited Combustion Instabilities in Two Different Combustion Systems

다국어 초록 (Multilingual Abstract)

The objective of this paper is to characterize dynamic pressure traces measured at self-excited combustion instabilities occurring in two combustion systems of different hardware. One system is a model lean premixed gas turbine combustor and the other a fullscale bipropellant liquid rocket thrust chamber. It is commonly observed in both systems that low frequency waves at around 300Hz are first excited at the onset of combustion instabilities and after a short duration, the instability mode becomes coupled to the resonant acoustic modes of the combustion chamber, the first longitudinal mode for the lean premixed combustor and the first tangential mode for the rocket thrust chamber. Low frequency waves seem to get excited at first since flame shows the higher heat release response on the lower frequency perturbations with the smaller phase differences between heat release and pressure fluctuations. Nonlinear time series analysis of pressure traces reveals that even stable combustion might have chaotic behavior with the positive maximum Lyapunov exponent. Also, pressure fluctuations under combustion instabilities reach a limit cycle or quasi-periodic oscillations at the very similar run conditions, which manifests that a selfexcited high frequency instability has strong nonlinear characteristics.

참고문헌 (Reference)

1 "Use of Chaos in a Lyapunov Dynamic Game" 17 (17): 1714-1724, 2003

2 "The Effect of Ambient Pressure Oscillations on the Disintegration and Dispersion of a Liquid Jet" October.1955

3 "Some Recent Results for Nonlinear Acoustics in Combustion Chambers" 32 (32): 146-169, 1994

4 "Response of a Laminar Premixed Flame to Flow Oscillations: A Kinematic Model and Thermoacoustic Instability Results" 106 : 487-510, 1996

5 "Parametric Study of Lean Premixed Combustion Instability in a Pressurized Model Gas Turbine Combustor" 1999

6 "Nonlinear Time Series Analysis" the University Press Chap. 3, Sec. 1-2 29-34, 1997

7 "Measurement and Analysis of Thermoacoustic Oscillations in a Simple Dump Combustor" 230 (230): 649-660, 2000

8 "Final Report on the Development of KSR-III Thrust Chamber Assembly, Korea Aerospace Research Institute" 2002

9 "Experimental Investigation of Limit-Cycle Oscillations in an Unstable Gas Turbine Combustor" 18 (18): 61-67, 2002

10 "Experimental Analysis of Thermo-Acoustic Combustion Instability" 70 : 179-191, 2001

11 "Effects of Periodic Atomization on Combustion Instability in Liquid-Fueled Propulsion Systems" 14 (14): 818-825, 1998

12 "Comprehensive Review of Liquid-Propellant Combustion Instabilities in F-1 Engines" 9 (9): 657-677, 1993

13 "Combustion Instability Phenomena of Importance to Liquid Bi-Propellant Rocket Engines" ii : 99-112, 1991

14 "Combustion Instability Mechanism of a Lean Premixed Gas Turbine Combustor" 17 (17): 906-913, 2003

15 "Characterization of Oscillations During Premix Gas Turbine Combustion" 120 : 294-302, 1998

16 "Characteristics of Self-excited Combustion Oscillation and Combustion Control by Forced Pulsating Mixture Supply" 17 (17): 1820-1831, 2003

17 "Chaos and Nonlinear Dynamics" Oxford University Press, Chap. 4 chaos and 4 (chaos and 4): 117-156, 2000

18 "Analysis of Observed Chaotic Data" Institute for Nonlinear Science, Springer-Verlag Chap. 1-3 1-3 : 1-37, 1996

19 "A Shock Wave Model of Unstable Rocket Combustors" 2 : 1285-1296, 1964

20 "A Mechanism of Combustion Instability in Lean Premixed Gas Turbine Combustors" 123 : 182-189, 2001