Measurement of Temperature and Concentration of OH Radicals in Combustion of Hydrogen and Ethanol by the Laser-Induced Fluorescence Technique

Boyarshinov, B. F.; Fedorov, S. Yu.

doi:10.1023/b:cesw.0000041402.12524.07

Cited by 6 publications

(10 citation statements)

References 3 publications

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“…Data on the absolute hydroxyl concentrations were obtained by the method of laser-induced fluorescence (LIF). Similar measurements were performed in boundary layers during ethanol combustion [11,12]. It was demonstrated that the coordinates of the OH and temperature maximums do not coincide, and the CH radical distribution has two maximums.…”

Section: Introductionmentioning

confidence: 60%

“…The present activities continue the research described in [11,12]. The goal is to find the boundaries of the heat-release region and heat-release intensity on the basis of experiments performed and to study the dependence of these factors on different transport mechanisms.…”

Section: Introductionmentioning

confidence: 88%

“…4. Shift of the coordinates of the maximums of temperature and OH concentration during combustion of a hydrogen jet in air: (a) experiment [12]; curve 1 shows the temperature, curve 2 is the polynomial approximation, and curve 3 is the profile of the OH radical; (b) corresponding calculations: maximum concentration of the OH radical on the boundary of the heat-release region where Q d = 0.…”

Section: Boundary Layer On a Flat Horizontal Wallmentioning

confidence: 99%

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Effect of heat transfer on the distributions of OH and CH radicals in the boundary layer with ethanol combustion

Boyarshinov

2008

Combust Explos Shock Waves

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The reasons for formation of superequilibrium concentrations of radicals are studied by means of joint consideration of experimental data on the distributions of CH and OH molecules formed during diffusion combustion of ethanol and data on heat transfer in the chemical reaction region. The air flow velocity near the stagnation point in experiments with combustion is 0.7 m/sec, and the flow velocity along a flat plate is 10 m/sec (the turbulence levels are 1 and 18%). Mutual locations of specific features in the distributions of the heat-release rate and temperature are analyzed and compared with the distributions of OH and CH radicals. For all turbulence levels and flow velocities considered, the maximum concentration of radicals is reached on the boundaries of the heat-release region, whose locations are determined by molecular transport mechanisms. It is demonstrated that this conclusion is applicable to experimental data on diffusion combustion of a submerged hydrogen jet in air.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 88%

Section: Boundary Layer On a Flat Horizontal Wallmentioning

confidence: 99%

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Effect of heat transfer on the distributions of OH and CH radicals in the boundary layer with ethanol combustion

Boyarshinov

2008

Combust Explos Shock Waves

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“…LIF-thermometry has been broadly employed to combustion research for accurate temperature determination. [22][23][24][25] The laser diagnostic ensures high spatial resolution without gas-dynamic disturbances into the flame. Furthermore, temperature is also a significant parameter to build reaction mechanisms to combustion modeling.…”

Section: Introductionmentioning

confidence: 99%

Temperature measurements by oh lif and chemiluminescence kinetic modeling for ethanol flames

Marques¹,

Santos²,

Sbampato³

et al. 2009

Quím. Nova

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Rod. dos Tamoios, km 5,5, 12228-001 São José dos Campos -SP, BrasilRecebido em 21/10/08; aceito em 4/5/09; publicado na web em 1/10/09 TEMPERATURE MEASUREMENTS BY OH LIF AND CHEMILUMINESCENCE KINETIC MODELING FOR ETHANOL FLAMES. OH LIF-thermometry was applied to premixed ethanol flames at atmospheric pressure in a burner for three flame conditions. Flame temperatures were simulated from energy equation with PREMIX code of CHEMKIN software package for comparison. A kinetic modeling based on a model validated through chemiluminescence measurements and on a set of reactions for nitrogen chemistry was evaluated. Marinov's mechanism was also tested. Sensitivity analysis was performed for fuel-rich flame condition with F = 1.34. Simulated temperatures from both reaction mechanisms evaluated were higher than experimental values. However, the proposed kinetic modeling resulted in temperature profiles qualitatively very close to the experimental.

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“…Appropriate laser equipment and methods for nonintrusive optical measurements of the concentration of OH radicals and the temperature of reaction products are now under development at the Institute of Thermophysics of the Siberian Division of the Russian Academy of Sciences [1]. Concerning the remaining species in combustion products, there are almost insuperable difficulties in obtaining reliable information necessary for determining the enthalpy and molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Method of reconstruction of the chemical composition and combustion efficiency of hydrogen-air mixtures from incomplete experimental data

Topchiyan

2008

Combust Explos Shock Waves

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A principal possibility of approximate reconstruction of the chemical composition in combustion of a hydrogen-air mixture at the end of the scramjet duct from incomplete experimental data (measured concentration of OH radicals and temperature) under the assumption of detailed chemical equilibrium of exchange reactions is analyzed. A closed algebraic system of equations including the concentration of OH radicals and the temperature as parameters is derived in this approximation. A code for solving this system numerically is developed for approximate determination of reaction completeness from the measured temperature and concentration of OH radicals. The model was tested by results of exact thermodynamic calculations of the Jouguet state and overdriven waves in a stoichiometric hydrogen-air mixture and various hydrogen-oxygen mixtures. In the range of pressures of 0.2 to 500 atm and temperatures of 2500 to 3500 K, this method allows the molecular weight and heat release to be reconstructed with accuracy sufficient for gas-dynamic calculations.

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Measurement of Temperature and Concentration of OH Radicals in Combustion of Hydrogen and Ethanol by the Laser-Induced Fluorescence Technique

Cited by 6 publications

References 3 publications

Effect of heat transfer on the distributions of OH and CH radicals in the boundary layer with ethanol combustion

Effect of heat transfer on the distributions of OH and CH radicals in the boundary layer with ethanol combustion

Temperature measurements by oh lif and chemiluminescence kinetic modeling for ethanol flames

Method of reconstruction of the chemical composition and combustion efficiency of hydrogen-air mixtures from incomplete experimental data

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