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Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels

It has been discovered that there is a dynamic coupling between cycloalkanes and aromatics, which affects the number and types of radicals, thereby controlling the ignition and combustion of fuels. Therefore, it is necessary to analyze the effects of cyclohexane production in multicomponent gasoline...

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Autores principales: Rao, Shunlu, Zheng, Zhaolei, Yang, Chao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10254882/
https://www.ncbi.nlm.nih.gov/pubmed/37298749
http://dx.doi.org/10.3390/molecules28114273
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author Rao, Shunlu
Zheng, Zhaolei
Yang, Chao
author_facet Rao, Shunlu
Zheng, Zhaolei
Yang, Chao
author_sort Rao, Shunlu
collection PubMed
description It has been discovered that there is a dynamic coupling between cycloalkanes and aromatics, which affects the number and types of radicals, thereby controlling the ignition and combustion of fuels. Therefore, it is necessary to analyze the effects of cyclohexane production in multicomponent gasoline surrogate fuels containing cyclohexane. In this study, a five-component gasoline surrogate fuel kinetic model containing cyclohexane was first verified. Then, the effect of cyclohexane addition on the ignition and combustion performance of the surrogate fuel was analyzed. This study shows that the five-component model exhibits good predictive performance for some real gasoline. Meanwhile, the addition of cyclohexane decreases the ignition-delay time of the fuel in the low and high temperature bands, which is caused by the early oxidation and decomposition of cyclohexane molecules, generating more OH radicals; in the medium temperature band, the isomerization and decomposition reactions of cyclohexane oxide cC(6)H(12)O(2) dominate the temperature sensitivity of the ignition delay, affecting the small molecule reactions that promote the generation of reactive radicals such as OH, thus inhibiting the negative temperature coefficient behavior of the surrogate fuel. The laminar flame speed of the surrogate fuels increased with the increase in the proportion of cyclohexane. This is due to the fact that the laminar flame speed of cyclohexane is higher than that of chain and aromatic hydrocarbons, and the addition of cyclohexane dilutes the ratio of chain and aromatic hydrocarbons in the mixture. In addition, engine simulation studies have shown that at higher engine speeds, the five-component surrogate fuel containing cyclohexane requires lower intake-gas temperatures to achieve positive ignition and are closer to the in-cylinder ignition of real gasoline.
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spelling pubmed-102548822023-06-10 Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels Rao, Shunlu Zheng, Zhaolei Yang, Chao Molecules Article It has been discovered that there is a dynamic coupling between cycloalkanes and aromatics, which affects the number and types of radicals, thereby controlling the ignition and combustion of fuels. Therefore, it is necessary to analyze the effects of cyclohexane production in multicomponent gasoline surrogate fuels containing cyclohexane. In this study, a five-component gasoline surrogate fuel kinetic model containing cyclohexane was first verified. Then, the effect of cyclohexane addition on the ignition and combustion performance of the surrogate fuel was analyzed. This study shows that the five-component model exhibits good predictive performance for some real gasoline. Meanwhile, the addition of cyclohexane decreases the ignition-delay time of the fuel in the low and high temperature bands, which is caused by the early oxidation and decomposition of cyclohexane molecules, generating more OH radicals; in the medium temperature band, the isomerization and decomposition reactions of cyclohexane oxide cC(6)H(12)O(2) dominate the temperature sensitivity of the ignition delay, affecting the small molecule reactions that promote the generation of reactive radicals such as OH, thus inhibiting the negative temperature coefficient behavior of the surrogate fuel. The laminar flame speed of the surrogate fuels increased with the increase in the proportion of cyclohexane. This is due to the fact that the laminar flame speed of cyclohexane is higher than that of chain and aromatic hydrocarbons, and the addition of cyclohexane dilutes the ratio of chain and aromatic hydrocarbons in the mixture. In addition, engine simulation studies have shown that at higher engine speeds, the five-component surrogate fuel containing cyclohexane requires lower intake-gas temperatures to achieve positive ignition and are closer to the in-cylinder ignition of real gasoline. MDPI 2023-05-23 /pmc/articles/PMC10254882/ /pubmed/37298749 http://dx.doi.org/10.3390/molecules28114273 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rao, Shunlu
Zheng, Zhaolei
Yang, Chao
Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title_full Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title_fullStr Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title_full_unstemmed Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title_short Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels
title_sort effect of cyclohexane on the combustion characteristics of multi-component gasoline surrogate fuels
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10254882/
https://www.ncbi.nlm.nih.gov/pubmed/37298749
http://dx.doi.org/10.3390/molecules28114273
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