“…Figure 3 shows that by increasing the number of grids more than 875(35×25), the difference between the centerline temperature distribution will decrease significantly. The maximum temperatures of the flame for the three grid cases are, respectively, equal to 1911, 1916, and 1917 K, which also shows that by increasing the number of meshes to more than 875, the maximum flame temperature will not change considerably.Figure 3.Grid independency graph of temperature at stoichiometric combustion for (25×20), (35×25), and (45×30) points (13). …”
Section: Resultsmentioning
confidence: 84%
“…Grid independency graph of temperature at stoichiometric combustion for (25×20), (35×25), and (45×30) points (13). …”
Section: Resultsmentioning
confidence: 99%
“…It is worth noting that the counterflow flame structure and pollutant emissions affected by palladium catalyst were investigated in the previous work of the authors. 13 This article is the second in a series on assessing the impact of catalyst-coated wall combustion chambers on flame structures, fuel consumption, and pollutant emission. The key aim is to analyze the influence of platinum catalytic–coated walls near the counterflow premixed flame on (a) the quality of combustion process, (b) fuel usage, and (c) pollutant emission; the idea of designing a newly proposed plus-shaped channel has been investigated in this study.…”
Analysis of unsteady CH4/Air counterflow premixed flame into a newly designed plus-shaped channel is investigated in this study. The main objective is to explore the impact of platinum catalytic–coated walls of the combustion chamber on the flame characteristics and pollutant emissions. The OpenFOAM platform is used as a numerical simulation tool to investigate the effects of various equivalence ratios, from the range of lean to rich flames, and passing the reaction time on the counterflow flame characteristics and pollutant emissions of a plus-shaped chamber with the platinum catalyst–coated wall. Results show that the integrated temperature over the proposed geometry with platinum surfaces increases by 18% compared to the non-catalytic case. The numerical simulation revealed that presence of the platinum catalyst on the wall of the chamber has significant impact on reducing the pollutant emissions. This is evident as a 99.5% decrease on NO2 emission and a 58% reduction on CO2 formation are found.
“…Figure 3 shows that by increasing the number of grids more than 875(35×25), the difference between the centerline temperature distribution will decrease significantly. The maximum temperatures of the flame for the three grid cases are, respectively, equal to 1911, 1916, and 1917 K, which also shows that by increasing the number of meshes to more than 875, the maximum flame temperature will not change considerably.Figure 3.Grid independency graph of temperature at stoichiometric combustion for (25×20), (35×25), and (45×30) points (13). …”
Section: Resultsmentioning
confidence: 84%
“…Grid independency graph of temperature at stoichiometric combustion for (25×20), (35×25), and (45×30) points (13). …”
Section: Resultsmentioning
confidence: 99%
“…It is worth noting that the counterflow flame structure and pollutant emissions affected by palladium catalyst were investigated in the previous work of the authors. 13 This article is the second in a series on assessing the impact of catalyst-coated wall combustion chambers on flame structures, fuel consumption, and pollutant emission. The key aim is to analyze the influence of platinum catalytic–coated walls near the counterflow premixed flame on (a) the quality of combustion process, (b) fuel usage, and (c) pollutant emission; the idea of designing a newly proposed plus-shaped channel has been investigated in this study.…”
Analysis of unsteady CH4/Air counterflow premixed flame into a newly designed plus-shaped channel is investigated in this study. The main objective is to explore the impact of platinum catalytic–coated walls of the combustion chamber on the flame characteristics and pollutant emissions. The OpenFOAM platform is used as a numerical simulation tool to investigate the effects of various equivalence ratios, from the range of lean to rich flames, and passing the reaction time on the counterflow flame characteristics and pollutant emissions of a plus-shaped chamber with the platinum catalyst–coated wall. Results show that the integrated temperature over the proposed geometry with platinum surfaces increases by 18% compared to the non-catalytic case. The numerical simulation revealed that presence of the platinum catalyst on the wall of the chamber has significant impact on reducing the pollutant emissions. This is evident as a 99.5% decrease on NO2 emission and a 58% reduction on CO2 formation are found.
“…The methane/air counterflow premixed mixture is entered into the plus-shaped chamber, which proposed by Edalati-nejad and his co-authors [6], to find the effects of Rhodium catalytic walls on the characteristics of counterflow flame. The methane/air mixture is entered from two sides of the plusshaped chamber with same initial temperature equal to 300K.…”
Section: Case Set-upmentioning
confidence: 99%
“…The experimental results illustrated that PPFs have different behaviour rather than those of TFs (tween flames), so that PPFs could exist for significantly higher strain rate values than TFs. In order to improve the counterflow methane/ air flames' characteristics, Edalati-nejad et al [6] used a proposed plusshaped channel to locate the palladium catalytic walls near the counterflow premixed flame. Their investigation was conducted at both non-catalytic and catalytic conditions.…”
In this paper, the presence of Rhodium catalyst walls near the premixed counterflow methane-air flame into a plus-shaped channel is investigated. To simulate the flame structure, a time dependent numerical analysis is carried out. The impact of reaction time and equivalence-ratio, from lean to rich combustion, on the flame characteristics are analysed and compared in catalytic and non-catalytic conditions. It is shown that the average value of CH4 mass fraction over the whole volume of the proposed geometry at the presence of Rhodium catalyst is decreased for about 26% relative to non-catalytic case. The results also showed that at different values of equivalence ratio, the maximum temperature of catalytic combustion is about 6% more than non-catalytic scenario. It is also shown that by passing the time, between 0.003s to 0.006s, average CH4 mass fraction for both catalytic and non-catalytic cases grow rapidly rather than that of after 0.006s; and also after 0.012s the flames would be steady.
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