The adiabatic flame temperature and laminar flame speed of methane premixed flames at varying pressures

Sakhrieh, Ahmad

doi:10.2298/apt1950220s

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The investigation conducted by Movileanu et al [11] focused on analyzing the adiabatic flame temperature (AFT) of different fuel-air mixtures in combustion processes that were either isobaric or isochoric. The examination carried out by Sakhrieh [12] delved into the impact of the equivalence ratio, pressure, and initial temperature parameters on the AFT and laminar flame speed. The results of the study indicated that the optimal values for the AFT and laminar flame speed were attained when the equivalence ratio was maintained at ϕ = 1.…”

Section: Introductionmentioning

confidence: 99%

A Graphical User Interface for Calculating Exergy Destruction for Combustion Reactions

Korukҫu

2024

Processes

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The combustion of fuels has been studied by many researchers as it is used in a wide range of engineering applications. The chemical equilibrium approach served as the foundation for the investigation of combustion reactions. This article presents a software application designed to facilitate the calculation of combustion processes by calculating the combustion of 16 fuels among the common alkanes (CnH2n+2) and alcohols (CnH2n+1OH). The Ozan Combustion Calculator (OCC) offers a user-friendly and efficient graphical user interface (GUI) that allows users to easily input data and obtain results. The program was developed using MATLAB 2021a and LaTeX software, ensuring its reliability and accuracy. To perform these calculations, the program utilizes calculations of the thermophysical properties of fuels and water obtained from tables. The program consists of five modules, each serving a specific purpose. These modules calculate various parameters, such as the Adiabatic Flame Temperature, Exergy of Combustion with Dry Air, Exergy of Combustion with Moist Air, Energy of Combustion with Dry Air, and Energy of Combustion with Moist Air. Additionally, the program can be used to investigate the impact of relative humidity on the adiabatic flame temperature and exergy destruction. The results obtained from the calculations reveal that the adiabatic flame temperature exhibits a linear decrease as the relative humidity increases. On the other hand, exergy destruction demonstrates a quadratic increase with higher relative humidity values. The program derives mathematical relationships for the adiabatic flame temperature and exergy destruction with respect to relative humidity values, with a high regression coefficient (r2=0.999). The versatility of OCC makes it suitable for various applications. It can be utilized in university settings for both undergraduate- and graduate-level courses, providing students with a practical tool for studying combustion processes. Additionally, it finds applications in industrial settings for the design and optimization of combustors, gas turbines, and burners. The user-friendly interface and accurate calculations make OCC a valuable resource in the field of combustion engineering.

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Section: Introductionmentioning

confidence: 99%

A Graphical User Interface for Calculating Exergy Destruction for Combustion Reactions

Korukҫu

2024

Processes

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“…Whilst these studies were performed under relatively low pressure conditions, the influence of high pressure on the flame behaviour cannot be neglected. Sakhrieh et al [4] showed that as the pressure was increased, the laminar flame speed of methane flame decreased. Additionally, Brower et al [5] showed that the ignition delay time of a hydrogen-methane flame was affected by a variation in both pressure and hydrogen content.…”

Section: Introductionmentioning

confidence: 99%

Co-Firing of Hydrogen and Natural Gas in a Practical DLN Combustor Model

Zhao,

Igie,

Abbott

et al. 2023

Volume 3B: Combustion, Fuels, and Emissions

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To reduce carbon dioxide emissions, the combustion of natural gas-hydrogen blends in a lean premix gas turbine combustor has been investigated. Previous studies have mostly investigated the fuel blends at relatively low pressure (up to 5 bar) with relatively low hydrogen concentrations (up to 50vol%) on lab-scale or generic burner configurations. However, the influence of higher pressure and higher hydrogen content (over 50vol%) has not been widely studied, particularly on a practical industry-scale lean premixed burner as presented in this study. Such an operation is more challenging as it increases the turbulent flame speed gradient, which is an important factor in determining the likelihood of boundary layer flashback. A preliminary RANS-based Computational Fluid Dynamics (CFD) study has been conducted using ANSYS Fluent 2021R1, employing the Realizable K-Epsilon turbulence model and the Flamelet-Generated Manifold (FGM) combustion model. The combustor consists of a diffusion pilot and premixed main fuel nozzles. Methane-hydrogen blends of up to 90vol% hydrogen were investigated at a fixed fuel energy input. 100vol% methane at 15 bar pressure was taken as the baseline reference case. To investigate the flame characteristics, contour plots of OH mass fraction, equivalence ratios and temperatures (at different planes) are presented. This study shows that the expected reduction in the flame length with increasing hydrogen concentration occurs up to 40vol%. Significantly different flame shapes (as indicated by OH contours) were seen at higher hydrogen content. For this model, the flashback occurred at 90vol% H2 as indicated by a premature development of the flame within the nozzle of the main fuel burner. NOx emissions are shown to progressively rise with increasing hydrogen content up to 60vol% but reduce as the hydrogen content increases to 70vol%. The decrease appears to be related to an improvement in the quality of fuel-air mixing. It is important to note that the apparent rate of increase in NOx with increasing hydrogen is dependent on the reporting approach used. When reporting conventionally (parts per million by volume corrected to 15% O2 on a dry basis) the increase is significantly greater than when reporting on a mass per fuel energy input basis (gram per Joule). Reporting in the conventional manner disadvantages hydrogen because of the impact of oxygen consumption and water production on the corrections.

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Modification of the Wiebe function for methane-air and oxy-methane- based spark-ignition engines

Alam

Rosa

Depcik

et al. 2021

Fuel

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The adiabatic flame temperature and laminar flame speed of methane premixed flames at varying pressures

Cited by 5 publications

References 12 publications

A Graphical User Interface for Calculating Exergy Destruction for Combustion Reactions

A Graphical User Interface for Calculating Exergy Destruction for Combustion Reactions

Co-Firing of Hydrogen and Natural Gas in a Practical DLN Combustor Model

Modification of the Wiebe function for methane-air and oxy-methane- based spark-ignition engines

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