The investigation of CO2 effect on the characteristics of a methane diffusion flame

Mortazavi, H.; Ma, Zhewen; Zhang, Yang

doi:10.1016/j.expthermflusci.2017.11.005

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…The first influencing factor is the reaction rate. Most of the CO 2 -diluted fuel studies attributed the increase in flame length to the decrease in the reaction rate. ,, The addition of diluent reduces the fuel concentration and the flame temperature, resulting in the reduction in the reaction rate. Compared with inert gases such as N 2 , CO 2 will not only dilute the fuel but also further participate in and hinder the decomposition reaction of CH 4 and O 2 , , so that the flame length of CO 2 -diluted flame is longer than that of N 2 -diluted flame.…”

Section: Resultsmentioning

confidence: 99%

“…41 The quantitative relationship can be obtained. For instance, when λ = 0.83, the linear relationship can be fitted by eq 6: a 0.344 3.410 0.83 = + = (6) where δ is the thickness of the OH* reaction zone and a is the strain rate. The thickness of the OH* reaction zone with an oxygen/fuel equivalence ratio of 1.25 is not completely linear with the square root of the strain rate.…”

Section: Effect Of Strain Ratementioning

confidence: 99%

“…Compared to 2012, biogas generation will double in 2022 . The increase of a large amount of CO 2 in the methane can significantly change the flame temperature, − burn intensity, soot concentration, height, − lift-off height, ignition time, and laminar flame speeds . It is necessary to study the CO 2 dilution effect of methane flames to ensure the efficient and safe combustion of alternative fuels such as biogas and biomass synthesis gas.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

et al. 2022

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OH* and CH* chemiluminescence in hydrocarbon flames are often applied to characterize flame structure, equivalence ratio, strain rate, heat release rate, etc. In this study, chemiluminescence images of OH*, CH*, and CO 2 * in the CH 4 / O 2 diffusion flame were obtained using a CCD camera imaging system. The effect of CO 2 dilution on the flame structure, strain rate, and other flame characteristics of CH 4 /O 2 diffusion flame was discussed. The results show that CO 2 dilution greatly affects flame morphology and chemiluminescence intensity. There are quantitative functions between the chemiluminescence peak intensity of OH* and CH* and the CO 2 dilution level. The CO 2 * average intensity in the flame zone is better suited to characterize the dilution level than the CO 2 * peak intensity. Moreover, the strain rate of CO 2 -diluted laminar flame is defined. It is found that there is a linear relationship between the thickness of the OH* reaction zone and the square root of the strain rate.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Strain Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

et al. 2022

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“…The soot radiation concentration analysis method introduced by Huang and Zhang was successfully applied to various combustion performance evaluations. , The sooty flame region and blue chemiluminescence included regions that can be identified and separated based on the post-processing image method introduced by Wang et al; hence, the blue flame of the captured images was filtered within the hue-value band ranging from 180° to 252°, while the sooty flame was filtered within the range from 10° to 70°, as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

Effects of Alternative Fuel Properties on Particulate Matter Produced in a Gas Turbine Combustor

et al. 2018

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Diversified fuel supplies and stringent environmental pollution regulations in the aviation sector have promoted the development of the alternative fuels industry. The chemical and physical properties of some of these diverse fuel substitutes lie outside of historical experience. Therefore, their combustion behavior cannot be judged via research of petroleum-derived jet fuel. Particulate matter (PM) emissions are important for future alternative fuels, although extensive results in relations to combustors are not available in the literature. Hence, large-scale experimental testing is essential for improving our understanding of alternative fuel effects on combustion performance and environmental impact. The aim of this study is to evaluate the impact of fuel properties and composition on the PM emission characteristics and flame sooty tendency profile on a Rolls-Royce Tay gas turbine combustor. Extractive sampling and in situ measurement methods have been used in this study. A total of 16 types of alternative fuels have been tested under two different operating conditions. PM emissions were measured via a differential mobility spectrometer (DMS 500 fast particulate spectrometer), and the soot propensity profile was analyzed via an innovative visual method based on flame luminosity high-speed imaging. The results indicate that a higher aromatic can be found as the main factor for insufficient burning and greater soot formation. In addition, for fuel properties, the density and surface tension were supposed to be key factors for soot formation. For chemical compositions, fuels with higher cycloparaffin content have the potential to induce soot promotion. In contrast, a fuel with a high hydrogen content can perform in a much more environmentally friendly way. Furthermore, it was observed that the results of PM emission measured by DMS 500 and sooting tendency computed via an imaging method (in situ) correlated particularly well for all of the tested fuels and conditions in this study. The in situ soot emission monitoring method presented in this study can be used for detailed, instantaneous investigation of PM emissions within the combustor. Thus, this method can be considered an alternative evaluation method for measuring qualitative soot emissions.

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Experimental investigation on a diffusion jet flame performance using a developed flame holder supplied with air from a concentric pipe

Mesallam¹,

Attia²,

El-Nagar³

et al. 2023

Alexandria Engineering Journal

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The investigation of CO2 effect on the characteristics of a methane diffusion flame

Abstract: Investigating the effect of mixing carbon dioxide with CH 4

Cited by 12 publications

References 28 publications

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Effects of Alternative Fuel Properties on Particulate Matter Produced in a Gas Turbine Combustor

Experimental investigation on a diffusion jet flame performance using a developed flame holder supplied with air from a concentric pipe

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The investigation of CO2 effect on the characteristics of a methane diffusion flame

Abstract: Investigating the effect of mixing carbon dioxide with CH 4

Cited by 12 publications

References 28 publications

Experimental Study on OH*, CH*, and CO2* Chemiluminescence Diagnosis of CH4/O2 Diffusion Flame with CO2-Diluted Fuel

Experimental Study on OH*, CH*, and CO2* Chemiluminescence Diagnosis of CH4/O2 Diffusion Flame with CO2-Diluted Fuel

Effects of Alternative Fuel Properties on Particulate Matter Produced in a Gas Turbine Combustor

Experimental investigation on a diffusion jet flame performance using a developed flame holder supplied with air from a concentric pipe

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Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel

Experimental Study on OH, CH, and CO₂* Chemiluminescence Diagnosis of CH₄/O₂ Diffusion Flame with CO₂-Diluted Fuel