Results 271 to 280 of about 4,115 (308)
Some of the next articles are maybe not open access.
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 ...
openaire +1 more source
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.
openaire +1 more source
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.
openaire +1 more source
Parametric control of combustion thermo-acoustic instabilities
IEEE Transactions on Control Systems Technology, 2003In this paper, a theoretical analysis and syntheses of a parametric controller for thermo-acoustic combustion instabilities in a liquid-fueled propulsion system is developed. A generalized wave equation describes the dynamic behavior of second order nonlinear oscillations.
Nidal Al-Masoud, Tarunraj Singh
openaire +1 more source
NONLINEAR/CHAOTIC MODELING AND CONTROL OF COMBUSTION INSTABILITIES
International Journal of Bifurcation and Chaos, 2010A discrete dynamic model accounting for both combustion and vaporization processes is proposed. In terms of different bifurcation parameters relevant to either combustion or evaporation, various bifurcation diagrams are presented. Furthermore, the corresponding Lyapunov exponent is calculated and employed to analyze the stability of the particular ...
Shenghui Lei, Ali Turan
openaire +1 more source
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 ...
openaire +1 more source
Surrogates for Combustion Instabilities in Annular Combustors
2018While the computational power is still increasing, thus arousing theinterest for high-fidelity simulations, the need of low-order models is also feltto both predict and understand combustion instabilities at low costs. Historicallyapplied to simple systems like longitudinal Rijke tubes to unveil the driven mechanismsleading to instability, they have ...
Bauerheim, Michael +2 more
openaire +3 more sources
Combustion instability: a distributed-parameter model
Proceedings of the 2003 American Control Conference, 2003., 2004Two distributed parameter models are suggested as models for thermo-acoustic combustion instability. A standing-wave model exhibits the expected qualitative behavior and is of interest for future stabilization studies.
openaire +1 more source
Effect of flame motion on longitudinal combustion instabilities
Aerospace Science and Technology, 2022Yan Song, Jingxuan Li, Lijun Yang
exaly