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Abstract <p>This work is dedicated to a numerical study of the chemistry and mechanism of combustion for binary fuels consisting of hydrogen and C<sub>2</sub> hydrocarbons. These fuels are considered very promising because they allow effective control over combustion characteristics by adjusting the ratio of the fuel components. It was found that replacing part of the hydrogen with acetylene in a stoichiometric premixed H<sub>2</sub>/air flame at a constant equivalence ratio results in a noticeable increase in the flame temperature, with a slight decrease in the flame speed. In the case of ethylene, the decrease in flame velocity is more significant. The flame temperature initially drops by 3 K and then slightly increases as the ethylene concentration rises. When part of the hydrogen is replaced by ethane, both the temperature and flame velocity decrease. According to the modeling results, partial replacement of hydrogen with acetylene, ethylene, or ethane in flames reduces the concentration of chain carriers (H, O, and OH), with the most significant effect on the concentration of the H atom. This indicates the determining influence of H on the speed of these flames, which is confirmed by the correlation between the normalized H concentrations and flame velocities. It was found that the higher concentration of H in the H<sub>2</sub>/C<sub>2</sub>H<sub>2</sub>/air flame is due to the significant contribution of the C<sub>2</sub>H<sub>2</sub> + O <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10975_2025_8546_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\( \rightleftarrows \)</EquationSource> <!--KinCat2560013Shvartsberg-m1--> </InlineEquation> HCCO + H step to H atom formation. The rate of this step in flames with added ethylene and ethane is significantly lower due to the much lower concentration of C<sub>2</sub>H<sub>2</sub>. On the one hand, the consumption of chain carriers during interactions with carbon-containing compounds negatively affects the H<sub>2</sub>/C<sub>2</sub>H<sub>2</sub>/air flame speed, while on the other hand, the increase in flame temperature has a positive effect due to the high endothermicity of acetylene.</p>

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Regularities of Combustion of Stoichiometric Mixtures of Hydrogen and C2 Hydrocarbons with Air

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • V. M. Shvartsberg,
  • A. G. Shmakov

摘要

Abstract

This work is dedicated to a numerical study of the chemistry and mechanism of combustion for binary fuels consisting of hydrogen and C2 hydrocarbons. These fuels are considered very promising because they allow effective control over combustion characteristics by adjusting the ratio of the fuel components. It was found that replacing part of the hydrogen with acetylene in a stoichiometric premixed H2/air flame at a constant equivalence ratio results in a noticeable increase in the flame temperature, with a slight decrease in the flame speed. In the case of ethylene, the decrease in flame velocity is more significant. The flame temperature initially drops by 3 K and then slightly increases as the ethylene concentration rises. When part of the hydrogen is replaced by ethane, both the temperature and flame velocity decrease. According to the modeling results, partial replacement of hydrogen with acetylene, ethylene, or ethane in flames reduces the concentration of chain carriers (H, O, and OH), with the most significant effect on the concentration of the H atom. This indicates the determining influence of H on the speed of these flames, which is confirmed by the correlation between the normalized H concentrations and flame velocities. It was found that the higher concentration of H in the H2/C2H2/air flame is due to the significant contribution of the C2H2 + O \( \rightleftarrows \) HCCO + H step to H atom formation. The rate of this step in flames with added ethylene and ethane is significantly lower due to the much lower concentration of C2H2. On the one hand, the consumption of chain carriers during interactions with carbon-containing compounds negatively affects the H2/C2H2/air flame speed, while on the other hand, the increase in flame temperature has a positive effect due to the high endothermicity of acetylene.