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Tuesday, July 21, 2020 | History

2 edition of Laminar burning velocities of methane-air flames. found in the catalog.

Laminar burning velocities of methane-air flames.

Robert Pritchard

Laminar burning velocities of methane-air flames.

by Robert Pritchard

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  • 36 Currently reading

Published by University of Salford in Salford .
Written in English


Edition Notes

PhD thesis, Chemical Engineering.

SeriesND3290/73
ID Numbers
Open LibraryOL19687545M

@article{osti_, title = {Laminar burning velocities and Markstein numbers of hydrocarbon/air flames}, author = {Tseng, L K and Ismail, M A and Faeth, G M}, abstractNote = {Effects of positive flame stretch on the laminar burning velocities of hydrocarbon/air mixtures were studied experimentally using outwardly propagating spherical flames. concentration on laminar burning velocities and NO formation of methane-air mixtures. Journal of Mechanical Science and Technology, , 28 (1), pp ￿/s￿. ￿hal-.

The hybrid results showed turbulent burning velocities that are typically higher than both dust and gas flames alone. For the smaller range of particle sizes, the hybrid burning velocities are to times larger than the laminar burning velocities of the dust alone (reported in Xie et al., ) and % higher than the gas alone.   The flame propagation during the deflagration of the propane–air mixtures with variable initial concentration, pressure, and temperature ([C3H8] = – vol %, p0 = 30– kPa, and T0 = – K) in a spherical closed vessel with central ignition was monitored by means of pressure measurements. Using an improved relationship for the burnt mass fraction, the burning velocities .

Laminar flame characteristics of natural gas-hydrogen-air flames were studied in a constant-volume bomb at normal temperature and pressure. Laminar burning velocities and Markstein lengths were obtained at various ratios of hydrogen to natural gas (volume fraction from 0 to %) and equivalence ratios (f from to ). methane-air flames by various inert gases and to provide better validity of the current C/H/O reaction mechanism for laminar flame propagation, especially in the near-limit region where flame temperature and burning velocity are low. We first present measurements of burning velocities of stoichiometric CH 4/Air/Diluent mixtures at NTP at.


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Laminar burning velocities of methane-air flames by Robert Pritchard Download PDF EPUB FB2

Combust Flame ; () [3] Tabatabaei AF and Soroudi MA, The Seventh Mediterranean Combustion Symposium, September, Sardinia, Italy, [4] Zahedi P and Yousefi K.

Effects of Pressure and Carbon Dioxide, Hydrogen and Nitrogen Concentration on Laminar Burning Velocities and NO Formation of Methane-Air by: Laminar burning velocities and flame instabilities of methane–n-heptane–air flames seem to be less sensitive to the methane content when the methane content is below The change in the initial temperature tends to diminish the difference in the laminar burning velocity between methane–air and n-heptane–air flames and only has weak Cited by: For this work, the effect of CO 2 dilution on laminar burning velocities of premixed methane/air flames was investigated at elevated temperature through both experiments and numerical simulations.

Validation of the experimental setup and methodology was completed through experimental testing of methane/air mixtures at 1 bar and by: 2. The aim of this study is to calculate the laminar burning velocity of a premixed methane-air flame using two different experimental methods -- the slot burner, and the Bunsen burner technique.

In both experiments flame angle and flame area are estimated by using a digital camera. The gas flow rates are measured using a flow Size: 1MB. Introduction. The adiabatic laminar burning velocity, S L, being a fundamental characteristic of a fuel + oxidizer mixture, which depends only on its composition, initial temperature and pressure, is of paramount significance in combustion defines the rate of a combustible mixture consumption and thus the heat release crucial in real applications; on the other hand, it is one of Author: Xinlu Han, Zhihua Wang, Yong He, Shixing Wang, Yingzu Liu, Alexander A.

Konnov. The laminar burning velocity can be considered as dependent on many independent variables as: V u = f x 1, x 2, x 3 ⋯ x n where these variables are measurement uncertainties (in temperature, flow rates, and Laminar burning velocities of methane-air flames. book position, etc), heat interaction between flame and wall, thermal feedback to the upstream mixture, flame stretch, and dead spaces.

burning velocities of both laminar and turbulent flames ; abnormal combustion such as detonation and knock ; and the like. This review will be primarily concerned with the experimental determination of one of the basic pro- perties of any combustible mixture--its laminar burn- ing velocity.

importanceof this burning velocity relatedto the safetyand stabilityof burning devices is addressed briefly. The last part of this section shows that the laminar burning velocity is also relevant for turbulent combustion modelling.

The laminar adiabatic burning velocity is only unambiguously defined in a one-dimensional (1D) situation. The flame propagation during the deflagration of the propane–air mixtures with variable initial concentration, pressure, and temperature ([C 3 H 8] = – vol %, p 0 = 30– kPa, and T 0 = – K) in a spherical closed vessel with central ignition was monitored by means of pressure measurements.

Using an improved relationship for the burnt mass fraction, the burning velocities. oblique flames • Laminar burning velocity • Field equation for the flame Calculations of the burning velocity of premixed methane-air flames • Mechanism that contains only C 1-hydrocarbons s L • Example: Burning velocities of propane flames taken from Kennel ().

T1 - Stretch and the adiabatic burning velocity of methane- and propane-air flames. AU - Maaren, van, A. AU - Goey, de, L.P.H. PY - Y1 - N2 - Results of measured adiabatic burning velocities of methane- and propane-air premixed laminar flames are presented, as.

Laminar Burning Velocities and Markstein Numbers of Hydrocarbon/Air Flames L.-K. TSENG, M. ISMAIL, and G. FAETH* Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI Effects of positive flame stretch on the laminar burning velocities of hydrocarbon/air mixtures were studied.

Besides the laminar flame, there were also a lot of researches conducted in fundamental premixed turbulent combustion on this mixed fuel, including the turbulent burning velocity and the statistical analysis of the flame front [, ].

Due to the government regulations on the emissions, fuel-lean combustion attracted more intentions. In the present work, the combustion characteristics like adiabatic flame temperature (AFT) and laminar burning velocity (LBV) of methane (CH 4) diluted with carbon dioxide (CO 2), representing biogas, is investigated in laboratory prepared biogas samples containing CH 4 and CO 2 were also enriched with hydrogen (H 2) to realize the change in their combustion behaviour.

Laminar burning velocities increase with increasing hydrogen fraction due to the high reactivity of leading to high production rate of H and OH radicals Measurements of laminar burning velocities of iso-octane and n-heptane have previously been performed by [van Lipzig et al.,] using a.

Laminar burning velocities of dimethyl carbonate (DMC) + air flames at initial gas mixture temperatures of,and K are reported. Nonstretched flames were stabilized on a perforated plate burner at atmospheric pressure, and the laminar burning velocities were determined using the heat flux method.

The overall accuracy of the burning velocities was evaluated to be. Effects of water vapor addition on the laminar burning velocity of oxygen-enriched methane flames A.N.

Mazasa,b,c,⇑, B. Fiorinaa,b, D.A. Lacostea,b, T. Schullera,b a CNRS, UPR Laboratoire d’Energétique Moléculaire et Macroscopique Combustion (EM2C), Grande Voie des Vignes, Châtenay-Malabry, France bEcole Centrale Paris, Grande Voie des Vignes, Châtenay.

Using this method, the laminar burning velocities of methane–air–diluent mixtures have been measured. A correlation has been developed for the range of pressures from to 70 atm, unburned gas temperatures from to K, fuel/air equivalence ratios from toand diluent addition from 0 to 15 percent by volume.

An uncommon non-monotonic behavior of the temperature dependence of adiabatic laminar burning velocity has been found in over-rich methane+air flames at equivalence ratio, ϕ =   Konnov et al.

measured the laminar flame speeds of CH 4 /O 2 /N 2 flames doped with NH 3 (% of the fuel) through a heat flux method: flame burning velocities were not influenced by the NH 3 admixture, probably due to its ultra-low concentration. In this study, measurements of laminar flame speeds obtained by several workers are collected, compared and critically analyzed with the aim to develop more accurate empirical correlations for laminar flame speeds as a function of equivalence ratio and unburned mixture temperature and pressure over a wide range of operating conditions, namely.The results show that both the turbulent burning velocity bending and the vitality of turbulent premixed flames are certain and surprising.

Logarithmic plots of turbulent burning velocities S T /S L – 1 against the turbulent intensities u'/S L reveal a transition, where S L is the laminar burning velocity.In addition to CH 4 /NH 3 /air flames, the Okafor reduced kinetics [46] was also shown to predict the laminar burning velocities of NH 3 /air and CH 4 /air flames satisfactorily at various high.