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Combustion instability additive investigation
35th Joint Propulsion Conference and Exhibit, 1999Combustion stability additives like zirconium carbide (ZrC), aluminum oxide (AO o is the angular frequency, ro is the particle relaxation time:
Fred Blomshield +2 more
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Wave instability in combustion
Computer Methods in Applied Mechanics and Engineering, 1991Abstract This paper presents formulations and calculations involved in combustion instability analysis using finite element methods. Emphasized in the present study is the effect of chemical reactions upon unstable waves of all variables. It is also shown how nonlinear, nonisentropic, and flowfields influence the stability of combustion waves.
T.J. Chung, W.S. Yoon
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Mechanisms of combustion instability
Symposium (International) on Combustion, 1965This paper presents results of a study aimed at understanding mechanisms involved in triggering, amplification, and suppression of acoustic waves, due to presence of flames. Experiments performed demonstrate that strong interactions between acoustic and flame oscillations can exist through flow oscillations, and that these interactions are due to ...
Tau-Yi Toong +3 more
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AIAA Journal, 1974
THE following equations governing the phenomenon of intrinsic instability of combustion, leading to low frequency oscillations in a rocket motor using a single liquid propellant, were derived and investigated by L. Crocco.
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THE following equations governing the phenomenon of intrinsic instability of combustion, leading to low frequency oscillations in a rocket motor using a single liquid propellant, were derived and investigated by L. Crocco.
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Asymptotic approach to combustion instability
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2005This paper presents an asymptotic approach to combustion instability in premixed flames under the assumptions of large activation energy and small Mach number. The entire flow consists of four distinct yet fully interactive sub-regions, which accommodate the chemical reaction, heat transport, hydrodynamics and acoustics, respectively.
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Incomplete combustion - A possible cause of combustion instability
AIAA Journal, 1983The performance of and the combustion in solid-propellant rocket motors may be affected by characteristic length \((L^*)\). For small characteristic lengths, the chamber pressure and characteristic velocity may be lower than in similar motors with larger \(L^*\). Oscillatory combustion may take place if the \(L^*\) is small enough. In the past, \(L^*\)
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Model-based control of combustion instabilities
Journal of Sound and Vibration, 2005Model-based control has been successfully implemented on an atmospheric pressure lean premixed combustion rig. The rig incorporated a pressure transducer in the combustor to provide a sensor measurement, with actuation provided by a fuel valve. Controller design was based on experimental measurement of the open loop transfer function. This was achieved
Aimee S. Morgans, Ann P. Dowling
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Computational Modeling of Self-Excited Combustion Instabilities
Journal of Engineering for Gas Turbines and Power, 2000It is well known that lean premixed combustion systems potentially offer better emissions performance than conventional non-premixed designs. However, premixed combustion systems are more susceptible to combustion instabilities than non-premixed systems. Combustion instabilities (large-scale oscillations in heat release and pressure) have a deleterious
Brookes, S. J. +3 more
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Propellant Combustion Instability as Measured by Combustion Recoil
AIAA Journal, 197211 Moore, C. B., "Vibration-Rotation Energy Transfer," Journal of Chemical Physics, Vol. 43, No. 9, Nov. 1965, p. 2979. 12 Shin, H. K., "Deexcitation of Molecular Vibration on Collisions: Vibration-tp-Rotation Energy "transfer in Hydrogen Halides," Journal of Physical Chemistry, Vol. 75, No. 8, Aug. 1971, p. 1079. 12 Shin, H.
C.M. MIHLFEITH, A.D. BAER, N.W. RYAN
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1968
Temporal variations in a combustion system are always present and take varieties of forms and intensity under different environments. A system is stable if a disturbance introduced into the system decreases in amplitude with time and eventually becomes lost in the random fluctuations prevailing in the system.
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Temporal variations in a combustion system are always present and take varieties of forms and intensity under different environments. A system is stable if a disturbance introduced into the system decreases in amplitude with time and eventually becomes lost in the random fluctuations prevailing in the system.
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