Laminar burning velocities of hydrogen-air and hydrogen-airsteam flames

Liu, D.D.S.; Macfarlane, Ronald

doi:10.1016/0010-2180(83)90151-7

Cited by 174 publications

(53 citation statements)

References 11 publications

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“…Experimental data on SL were collected from [9][10][11][12][13][14][15][16][17][18][19][20]. For each type of mixture an appropriate analytical function was chosen to describe dependencies of SL on hydrogen concentration ( or diluent concentration).…”

Section: Mixture Propertiesmentioning

confidence: 99%

Evaluation of limits for effective flame acceleration in hydrogen mixtures

Dorofeev

Кузнецов

Алексеев

et al. 2001

Journal of Loss Prevention in the Process Industries

105

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Results of experimental data analysis on turbulent flame propagation in obstructed channels is presented. The data cover a wide range of mixtures: H 2 /air and H2/air/steam mixtures (from lean to rich) at normal and elevated initial temperatures (from 298 to 650K) and pressures (from 1 to 3 bars); and stoichiometric H 2 /02 mixtures diluted with N2, Ar, He, and C02 at normal initial conditions. The data set chosen covers, also, a wide range of scales exceeding two orders of magnitude. It is shown that basic flame parameters, such as mixture expansion ratio 0', Zeldovich number ß, and Lewis number Le, can be used to estimate a priori a potential for effective flame acceleration for a given mixture. The critical conditions for effective flame acceleration are suggested in the form f3 > l3*(Le, ß) on the basis of experimental correlations. Critical l3*-values are found tobe in the range from 3.5 to 4.0, for stable flames (ß(Le-I)> -2). For unstable flames (ß(Le-I)< -2), f3* is given by a function of Zeldovich number ß. The requirement of large enough mixture expansion ratio (J > l3*(Le, ß) can be used in practical applications as the necessary condition or criterion for possible development of fast combustion regimes. On this basis, limits for effective flame acceleration can be defined for hydrogen combustibles. Uncertainties in determination ofcritical f3*-values, which should be taken into account in practical applications, are discussed. 5. ZUSAMMENFASSUNG Bestimmung der Bedingungen für Flammenbeschleunigung in Wasserstoffhaitigen BrenngasenPractical applications and uncertainties 10Summary and conclusions 12References 13 NOMENCLATURE LatinA -elementary area of the flame surface;Csr -sound speed in reactants;Csp -sound speed in combustion products;d -size of orifice;Ea -effective activation energy;h -height of obstacles;L-characteristic geometrical size (e.g., obstacle spacing);Lr-integrallength scale of turbulence;Le -Lewis number;Le1-Lewis number defined by fuel diffusion coefficient in stoichiometric mixture;Leo -Lewis number defined by oxidizer diffusion coefficient in stoichiometric mixture;Mab -Markstein number defined relative to burned mixture; n1-reaction order for fuel;no -reaction order for oxidizer; R -gas constant;SL -laminar burning velocityrelative to unburned mixture;Tb -maximum flame temperature;Tu -initial mixture temperature;Un -normal burning velocity of stretched flames relative to burned mixture; UL -laminar burning velocity relative to burned mixture; a-ratio of densities of reactants and products ( expansion ratio);X-temperature diffusivity.

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Section: Mixture Propertiesmentioning

confidence: 99%

Evaluation of limits for effective flame acceleration in hydrogen mixtures

Dorofeev

Кузнецов

Алексеев

et al. 2001

Journal of Loss Prevention in the Process Industries

105

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“…8 yield Figure 1 shows the laminar burning velocities for hydrogen-air mixtures (Günther and Janisch, 1972;Andrews and Bradley, 1973;Liu and MacFarlane, 1983;Berman, 1984;Koroll et al, 1993;Aung et al, 1997). These experimental data have been validated by several researchers and considered to be the accurate laminar burning velocities which can be used to get kinetic parameters.…”

Section: Global Mechanismmentioning

confidence: 90%

Numerical Simulation of Hydrogen Combustion: Global Reaction Model and Validation

Zhang

Liu

2017

Front. Energy Res.

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Due to the complexity of modeling the combustion process in nuclear power plants, the global mechanisms are preferred for numerical simulation. To quickly perform the highly resolved simulations with limited processing resources of large-scale hydrogen combustion, a method based on thermal theory was developed to obtain kinetic parameters of global reaction mechanism of hydrogen-air combustion in a wide range. The calculated kinetic parameters at lower hydrogen concentration (C hydrogen < 20%) were validated against the results obtained from experimental measurements in a container and combustion test facility. In addition, the numerical data by the global mechanism (C hydrogen > 20%) were compared with the results by detailed mechanism. Good agreement between the model prediction and the experimental data was achieved, and the comparison between simulation results by the detailed mechanism and the global reaction mechanism show that the present calculated global mechanism has excellent predictable capabilities for a wide range of hydrogen-air mixtures.

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“…Discussion respective temperatures. For example, for a 10 percent hydrogen mixture at 300K and 650K, the laminar burning velocity is 0.4 m/s and 1.5 m/s, respectively (Liu and MacFarlane, 1983). Therefore, the flow ahead of the flame is turbulent for all steady flame velocities.…”

Section: Discussionmentioning

confidence: 99%