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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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Driving Mechanisms for Combustion Instability
Combustion Science and Technology, 2014The processes affecting the nonlinear acoustic stability of a combustor are examined in an overview fashion. Emphasis is placed on liquid-propellant rocket motors but other systems are briefly mentioned and some broadly applied principles and observations are discussed.
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Combustion instabilities in propulsion systems
The Journal of the Acoustical Society of America, 2000Periodic acoustic motions in combustion chambers, a phenomenon commonly known as combustion instability, were discovered in air-breathing and rocket engines at about the same time in the late 1930s. Since then, unstable oscillations have occurred in most, if not practically all, new development programs.
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L*-Combustion Instability in Solid Propellant Rocket Combustion
1985An analysis of the L*-combustion instability in solid propellant rockets is formulated to include (1) secondary or residual combustion in the rocket chamber and (2) the change of the mean chamber pressure. The aim was to explore if these factors might remedy the failure of the many transient heat-transfer theories with quasi-steady gaseous-phase ...
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