Ignition characteristics of methane-air mixture at low initial temperature
In this paper, FLUENT software coupled with the chemical reaction mechanism is used to study the ignition characteristics of methane-air mixtures at low temperature. Variations of the main free radical concentrations, the critical conditions for a successful ignition and the chemical reaction rate o...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.1003470/full |
| _version_ | 1828071518761910272 |
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| author | Chao Yang Qing Han Haibo Liu Yuanyuan Wang Ran Cheng |
| author_facet | Chao Yang Qing Han Haibo Liu Yuanyuan Wang Ran Cheng |
| author_sort | Chao Yang |
| collection | DOAJ |
| description | In this paper, FLUENT software coupled with the chemical reaction mechanism is used to study the ignition characteristics of methane-air mixtures at low temperature. Variations of the main free radical concentrations, the critical conditions for a successful ignition and the chemical reaction rate of each elementary reaction for a failure ignition are obtained, respectively. Results indicate that the consumption of methane immediately affects the concentration distribution of carbon monoxide, which presents the opposite relationship with that of methane. Mass fractions of the intermediate products and H, O free radicals are low in the burnt zone and unburnt zone, whereas reach the maximum on the flame front. OH is not only the intermediate free radical, but also the combustion product remained by the intermediate reactions. At a low temperature of 150 K, the critical radius and temperature of methane ignition are 4.6 mm and 1180 K, respectively. When ignition radius is smaller than the critical value, the failed ignition of methane is caused by the termination of the elementary reactions: R8: H + O2 = OH + O, R9: OH + O = O2 + H, R12: O + H2O = 2OH and R13: 2OH = O + H2O. However, when ignition temperature is lower than the critical value, because of the failed initiation of elementary reaction R1: CH4 = CH3 + H, the combustion of methane is not occurred. |
| first_indexed | 2024-04-11T00:55:27Z |
| format | Article |
| id | doaj.art-6bc31d910f794fc79c4cf4576ebfdbad |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-04-11T00:55:27Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-6bc31d910f794fc79c4cf4576ebfdbad2023-01-05T06:18:24ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2023-01-011010.3389/fenrg.2022.10034701003470Ignition characteristics of methane-air mixture at low initial temperatureChao YangQing HanHaibo LiuYuanyuan WangRan ChengIn this paper, FLUENT software coupled with the chemical reaction mechanism is used to study the ignition characteristics of methane-air mixtures at low temperature. Variations of the main free radical concentrations, the critical conditions for a successful ignition and the chemical reaction rate of each elementary reaction for a failure ignition are obtained, respectively. Results indicate that the consumption of methane immediately affects the concentration distribution of carbon monoxide, which presents the opposite relationship with that of methane. Mass fractions of the intermediate products and H, O free radicals are low in the burnt zone and unburnt zone, whereas reach the maximum on the flame front. OH is not only the intermediate free radical, but also the combustion product remained by the intermediate reactions. At a low temperature of 150 K, the critical radius and temperature of methane ignition are 4.6 mm and 1180 K, respectively. When ignition radius is smaller than the critical value, the failed ignition of methane is caused by the termination of the elementary reactions: R8: H + O2 = OH + O, R9: OH + O = O2 + H, R12: O + H2O = 2OH and R13: 2OH = O + H2O. However, when ignition temperature is lower than the critical value, because of the failed initiation of elementary reaction R1: CH4 = CH3 + H, the combustion of methane is not occurred.https://www.frontiersin.org/articles/10.3389/fenrg.2022.1003470/fullmethaneignitionfree radicalscritical conditionselementary reactionslow temperature |
| spellingShingle | Chao Yang Qing Han Haibo Liu Yuanyuan Wang Ran Cheng Ignition characteristics of methane-air mixture at low initial temperature Frontiers in Energy Research methane ignition free radicals critical conditions elementary reactions low temperature |
| title | Ignition characteristics of methane-air mixture at low initial temperature |
| title_full | Ignition characteristics of methane-air mixture at low initial temperature |
| title_fullStr | Ignition characteristics of methane-air mixture at low initial temperature |
| title_full_unstemmed | Ignition characteristics of methane-air mixture at low initial temperature |
| title_short | Ignition characteristics of methane-air mixture at low initial temperature |
| title_sort | ignition characteristics of methane air mixture at low initial temperature |
| topic | methane ignition free radicals critical conditions elementary reactions low temperature |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2022.1003470/full |
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