Results 251 to 260 of about 4,115 (308)

Computational Modeling of Self-Excited Combustion Instabilities

Journal of Engineering for Gas Turbines and Power, 2000
It 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., Cant, R. S., Dupere, I. D J, Dowling, A. P.   +3 more
openaire   +3 more sources

Analysis of the dynamic characteristics of combustion instabilities in a pre-mixed lean-burn natural gas engine

Applied Energy, 2016
Highlights\ud \ud - Combustion instabilities in a pre-mixed lean-burn natural gas engine were studied.\ud \ud - Effect of gas injection timing on the complexity of combustion system was analysed.\ud \ud - Analysis is based on return map, recurrence ...
En-Zhe Song, Shun-Liang Ding, Richard J Brown   +2 more
exaly   +2 more sources

Feedback Control of Combustion Instabilities Using a Helmholtz Resonator with an Oscillating Volume

Combustion Science and Technology, 2012
A feedback control strategy is developed for mitigating combustion instabilities using a Helmholtz resonator with an oscillating volume. This is based on the fact that the frequency at which the resonator provides maximum damping can be controlled by ...
Dan Zhao, Junwei Li
exaly   +2 more sources

Damping combustion instabilities with perforates at the premixer inlet of a swirled burner

Proceedings of the Combustion Institute, 2009
International audienceDespite extensive efforts, controlling combustion instabilities in modern gas turbines remains a challenge at the design stage.
Sébastien Ducruix, Thierry Schuller
exaly   +2 more sources

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Mechanisms of combustion instability

Symposium (International) on Combustion, 1965
This 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, Salant Richard F., Stopford John M., Anderson Griffin Y.   +3 more
openaire   +1 more source

On nonlinear combustion instability

33rd Joint Propulsion Conference and Exhibit, 1997
A crucial need in rocket motor development programs is a valid analytical/computational model of nonlinear combustion instability. The motor designer frequently must attempt to estimate not only the probability that a particular acoustic mode may "tend to grow," but what will be the amplitude of the oscillations if they are triggered in some way.
S. Malhotra, G. Flandro, S. Malhotra, G. Flandro   +3 more
openaire   +1 more source

Wave instability in combustion

Computer Methods in Applied Mechanics and Engineering, 1991
Abstract 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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On the Hybrid Combustion Instability

Applied Mechanics and Materials, 2014
In the present paper, a combined method of large eddy simulations for non-premixed combustion in a turbulent flow coupled with proper orthogonal decomposition of instantaneous velocity, pressure and temperature fields is developed in order to identify the effect of coherent structure and to obtain a reduced order model for control model.
Sterian Danaila, Constantin Leventiu
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Instability of Combustion

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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Incomplete combustion - A possible cause of combustion instability

AIAA Journal, 1983
The 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, \(L^*\)
openaire   +1 more source