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<p>A series of C<sub>2</sub>H<sub>2</sub> jet flames were investigated with respect to the soot formation, species distribution, and velocity fields from both experimental and numerical point of view. The flame flow velocities were measured by a particle image velocity (PIV) with a newly-designed continuous laser of 18 W. The experimental results show a significant difference in flame velocity between lean and rich conditions. The lean condition exhibits higher flame velocity, while the rich condition leads to more intense reactions and the formation of vortices at the flame base. A 2-dimensional computational model was employed to investigate the influence of equivalence ratio <i>Φ</i> on combustion characteristics. As <i>Φ</i> increases from 0.8 to 1.5, the distributions of key free radicals such as OH, H, and O are affected. A further increase in <i>Φ</i> results in the generation of soot. Moreover, the increased <i>Φ</i> also affects the processes of axis soot nucleation, oxidation and surface growth rate. The continuous laser PIV system constructed in this paper can provide C<sub>2</sub>H<sub>2</sub> jet flame velocity, which can be also used in other flow field to measure the flow field velocity.</p>

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Experimental and Numerical Study of the C2H2 Jet Flames Flow Field

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Junkai Wu,
  • Du Wang,
  • Wen Lu,
  • Huakang Li,
  • Fengming Chu,
  • Zhenyu Tian

摘要

A series of C2H2 jet flames were investigated with respect to the soot formation, species distribution, and velocity fields from both experimental and numerical point of view. The flame flow velocities were measured by a particle image velocity (PIV) with a newly-designed continuous laser of 18 W. The experimental results show a significant difference in flame velocity between lean and rich conditions. The lean condition exhibits higher flame velocity, while the rich condition leads to more intense reactions and the formation of vortices at the flame base. A 2-dimensional computational model was employed to investigate the influence of equivalence ratio Φ on combustion characteristics. As Φ increases from 0.8 to 1.5, the distributions of key free radicals such as OH, H, and O are affected. A further increase in Φ results in the generation of soot. Moreover, the increased Φ also affects the processes of axis soot nucleation, oxidation and surface growth rate. The continuous laser PIV system constructed in this paper can provide C2H2 jet flame velocity, which can be also used in other flow field to measure the flow field velocity.