Results 91 to 100 of about 539 (136)

Experimental evaluation of Markstein-number influence on thermoacoustic instability

Combustion and Flame, 2004
Laminar, premixed methane–air flames propagating through the annulus of a Taylor–Couette burner were studied experimentally. Such flames ignited at the top, open end of the burner and propagating downward toward the closed end are susceptible to the Darrieus–Landau hydrodynamic instability as well as to thermoacoustic instabilities that develop.
R.C Aldredge, N.J Killingsworth
openaire   +1 more source

Markstein numbers in counterflow, methane- and propane- air flames: a computational study

Combustion and Flame, 2002
The concept of Markstein numbers with respect to unburned and burned gases is first reviewed. We next present numerical simulations of methane–air and propane–air flames in the counterflow configuration using a detailed chemical kinetic model consisting of 469 reactions and 71 species.
Davis, Scott, Quinard, Joël, Searby, Geoffrey   +2 more
openaire   +2 more sources

Laminar burning velocities and Markstein numbers of syngas–air mixtures

Fuel, 2010
Abstract In the currently reported work, three typical mixtures of H 2 , CO, CH 4 , CO 2 and N 2 have been considered as representative of the producer gas coming from wood gasification. Laminar burning velocities have been determined from schlieren flame images at normal temperature and pressure, over a range of equivalence ratios within the ...
Eliseu Monteiro, Marc Bellenoue, Julien Sotton, Nuno Afonso Moreira, Salvador Malheiro   +4 more
openaire   +1 more source

Approximations for burning velocities and markstein numbers for lean hydrocarbon and methanol flames

Combustion and Flame, 1997
Burning velocities of lean-to-stoichiometric n-heptane-, iso-octane-, and methanol-air mixtures have been numerically calculated over a wide range of pressure and preheat temperatures. The numerical calculations are based on elementary reaction mechanisms comprising a few hundred reactions.
U.C. Müller, M. Bollig, N. Peters
openaire   +1 more source

Compressibility Effect on Markstein Number for a Flame Front in Long-Wavelength Approximation

2021
The effect of compressibility on the Markstein number for a planar front of a premixed flame is examined, at small Mach numbers, in the form of M2-expansions. The method of matched asymptotic expansions is used to analyze the solution in the preheat zone in a power series in two small parameters, the relative thickness of the preheat zone and the Mach ...
Keigo Wada, Yasuhide Fukumoto
openaire   +1 more source

Influence of Pressure on Markstein Number Effect in Turbulent Flame Front Propagation

Volume 1A: Combustion, Fuels and Emissions, 2013
In gas turbine operation a turbulent flame is employed. Thus, better understanding of the turbulent flame propagation is the key for further optimisation of turbine combustors and reduction of the environmental footprint. As turbulent flames are exposed to stretch, the effect of flame-stretch interaction must be better understood especially at higher ...
Vukadinovic, V., Zarzalis, N., Habisreuther, P., Suntz, R.   +3 more
openaire   +1 more source

The development and structure of flame instabilities and cellularity at low Markstein numbers in explosions

Combustion and Flame, 2000
Abstract Flame instabilities and the formation of cellular structures during spherical gaseous explosions have been studied experimentally using natural light and schlieren high-speed cine photography, as well as single-shot planar laser-induced fluorescence (PLIF) from the OH radical.
D. Bradley, C.G.W. Sheppart, R. Woolley, D.A. Greenhalgh, R.D. Lockett   +4 more
openaire   +1 more source

A Model for Predicting Turbulent Burning Velocity by using Karlovitz Number and Markstein Number under EGR Conditions

SAE Technical Paper Series, 2021
<div class="section abstract"><div class="htmlview paragraph">The purpose of this paper is to build up a model for predicting turbulent burning velocity which can be used for One-Dimensional (1D) engine simulation. This paper presents the relationship between turbulent burning velocity, the Karlovitz number, and the Markstein number for ...
Kei Yoshimura, Kohei Ozawa, Kyohei Yamaguchi, Ratnak Sok, Jin Kusaka, Masaaki Togawa, Satoshi Tokuhara   +6 more
openaire   +1 more source

Finding the markstein number using the measurements of expanding spherical laminar flames

Combustion and Flame, 1997
Abstract Depedencies of the radii of expanding spherical flames on time elapsed after spark ignition have been measured using a high-speed Schlieren technique in a constant volume bomb. These dependencies are analyzed in order to find the Markstein numbers. Various methods of finding different Markstein numbers are considered.
Vladimir P. Karpov, Andrei N. Lipatnikov, Piotr Wolanski   +2 more
openaire   +1 more source

Measurements of flamelet orientations in premixed flames with positive and negative Markstein numbers

Proceedings of the Combustion Institute, 2000
Measurements of instantaneous flamelet surface orientation of preferential diffusion stable, ethylene/air and unstable, methane/air flames are presented for three different values of normalized turbulence intensity, u′/S L o , where S L o is the unstretched laminar flame speed.
D.A. Knaus, F.C. Gouldin
openaire   +1 more source