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Control of combustion oscillations
Combustion Science and Technology, 2003Combinations of small quantities of fuel and imposed oscillations are shown to ameliorate combustion oscillations in ducted flows of premixed methane and air with equivalence ratios from the lean limit to stoichiometry. A sudden expansion from 51 to 80 mm stabilized the flames and the control arrangements were evaluated with an unconstricted exit and ...
I. Emiris, J. H. Whitelaw
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Oscillations in fuel combustion
Combustion, Explosion and Shock Waves, 1983Some well-known experimental facts about the combustion of solid homogenous dibasic fuels at a constant are considered in this paper on the basis of the theoretical possibility that the combustion is self-oscillatory in character. The fact that a burning fuel may be extinguished if the external pressure is reduced sufficiently rapidly is interpreted ...
A. G. Istratov, V. N. Marshakov
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Oscillations and chaos in CO+O2 combustion
Chaos: An Interdisciplinary Journal of Nonlinear Science, 1991The gas-phase reaction between carbon monoxide and oxygen (in the presence of small amounts of hydrogen) shows bistability and oscillatory behavior. Typically, the oscillatory ignition has a period-1 relaxation waveform. The limit cycle is born at a saddle-node loop and terminates via a supercritical Hopf bifurcation.
Johnson, B. R. +2 more
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Feedback control of combustion oscillations in combustion chambers
Communications in Nonlinear Science and Numerical Simulation, 2010Abstract Model-based algorithms are generally employed in active control of combustion oscillations. Since practical combustion processes consist of complex thermal and acoustic couplings, their accurate models and parameters may not be obtained in advance economically, a model free controller is necessary for the control of thermoacoustic ...
Wei Wei +4 more
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Thermokinetic Oscillations in Acetaldehyde CSTR Combustion
Combustion Science and Technology, 1993Abstract Acetaldehyde combustion process in CSTR has been simulated by means of a model capable of describing the complex dynamic behavior experimentally observed, including periodic cool flames, single and complex waveform periodic ignitions and jumps.
DI MAIO, Francesco Paolo +2 more
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Spontaneous oscillations inlean premixed combustion
Combustion Science and Technology, 2002The combustion reaction taking place under the typical operating conditions of lean premixed combustors was studied by mans of the bifurcation theory. The combustion zone was modeled as perfectly mixed and without coupling with acoustic. Theoretical stability amps were built as a function of the most important operating parameters (heat transfer ...
Di Benedetto, A., Marra, F.S., Russo, G.
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Control of Combustion Oscillations Close to Stoichiometry
Flow, Turbulence and Combustion, 2000The oscillations that occur in ducted plane and round sudden-expansions with combustion of premixed air and methane have been examined for flow conditions which gave rise to large amplitudes corresponding to half-waves. They were present above a minimum flow rate and in a range of equivalence ratios that increased slightly with flow rate and centred ...
de Zilwa, S. R. N. +2 more
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Adaptive control of combustion oscillations
4th AIAA/CEAS Aeroacoustics Conference, 1998© 1997 by S. Evesque and A.P. Dowling. Self-excited oscillations of a ducted flame, burning in the wake of a bluff-body flame-holder, are considered. The non-linear kinematic model used here to describe these oscillations calculates the influence of the velocity fluctuations on the shape of the flame surface, and hence on the heat release rate.
S. Evesque, A. Dowling
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Combustion Stabilization by Forced Oscillations in a Duct
SIAM Journal on Applied Mathematics, 2005The author develops a model and mathematical technique in order to simulate an active control input-output mechanism. The developed model describes the interaction of an existing oscillation in the combustor with a control input and with a flame. Such a model and mathematical technique significantly differ from that used by previous authors for single ...
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Combustion oscillations in industrial combustion chambers
Symposium (International) on Combustion, 1969Combustion roar is a “white” noise radiated from small regions in the flame which suddenly burn. Single frequency oscillations of the simple acoustic type in the combustion chamber (“screaming”) have a frequency 500 cps upwards; Helmholtz resonator oscillations have a frequency of the order of 10 times lower and occur fairly frequently in oil- and gas ...
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