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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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Neural prediction of combustion instability
Applied Energy, 2002Abstract Combustion instabilities consist in self–exited oscillations in combustion chambers and can cause structure degradations. When combustion instabilities occur, the combustion process is characterised by the coupling of various non-linear phenomena, which can lead to the formation of either a limit cycle or chaos.
CAMMARATA, Luigi +2 more
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IMC control of combustion instability
2008 27th Chinese Control Conference, 2008Combustion instability is a phenomenon that happens in a gas turbine when the lean premixed combustion mode is used to reduce the NOx emissions. The process is unstable and thus difficult to control. This paper applies the internal model control (IMC) method in the control of the combustion instability, with the aim of finding effective control ...
null Fu Caifen +2 more
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Instabilities in Gaseous Combustion
2015By means of high-speed color cinematography, it was shown that the flames in lean Н2–air mixtures at an initial stage propagate symmetrically and the flame radius can be estimated from the frames of speed filming. It is shown that sufficiently strict calculation of cellular structure of the flame front of lean hydrogen mixtures requires consideration ...
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Combustion instability studies with plastic propellent
5th Propulsion Joint Specialist, 1969The eifect of compositional changes on the stability of combustion of plastic propellent, based upon ammonium perchlorate and polyisobutene, is investigated using a 2-in.-diam T burner for the frequencies 0.7-4.0 kHz at 1000 psig. Oxidizer particle size can have a pronounced effect both on the acoustic response and on the maximum pressure amplitude ...
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Pulsating instability in stagnation combustion
Symposium (International) on Combustion, 1985A pulsating thermal-diffusive instability is predicted at all non-unity Lewis numbers for a diffusion flame in stagnation-point flow over a pool of vaporizing fuel. The mechanism driving the instability is similar to that recently analyzed for a one-dimensional flow configuration, namely the coupling of the heat source at the flame to the vapor source ...
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