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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 3: 1231 - 1241

DOI: https://doi.org/10.1007/s11630-024-1939-7

Influence of Mixture Gas Conditions on the Laminar Combustion Characteristics of Natural Gas

  • LOU Diming ,
  • ZHU Kan ,
  • ZHANG Yunhua ,
  • REN Yedi ,
  • TAN Piqiang ,
  • FANG Liang ,
  • FAN Lanlan
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  • 1. School of Automotive Studies, Tongji University, Shanghai 201804, China
    2. Ji’nan Power Co. Ltd, Sinotruk Group, Ji’nan 250200, China

网络出版日期: 2024-04-30

基金资助

The financial support is provided by the National Key R&D Program of China (2022YFE0100100).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Influence of Mixture Gas Conditions on the Laminar Combustion Characteristics of Natural Gas

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  • 1. School of Automotive Studies, Tongji University, Shanghai 201804, China
    2. Ji’nan Power Co. Ltd, Sinotruk Group, Ji’nan 250200, China

Online published: 2024-04-30

Supported by

The financial support is provided by the National Key R&D Program of China (2022YFE0100100).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

天然气是一种极具前景的内燃机替代燃料，天然气发动机成为了一种应对能源短缺与气候变化的高效可行的措施。由于层流火焰特性是湍流火焰的基础，天然气的层流火焰特性对发动机缸内燃烧状况和效率产生重要影响。采用可视化定容燃烧弹开展了天然气层流燃烧特性研究，开展了不同混合气配比、过量空气系数和初始条件的天然气预混层流燃烧测试。试验结果表明，与丙烷相比，乙烷对层流燃烧速度的影响更为显著，每增加2.5 %乙烷占比，平均提升约5.1 %的层流燃烧速度。不同过量空气系数下的天然气层流燃烧速度在λ=1.0附近有极大值，火焰的马克斯坦长度随λ的升高而减小。混合气初始压力的升高使得火焰层流燃烧速度降低，马克斯坦长度显著降低。混合气初始温度的升高会使得天然气层流燃烧速度快速增大，但对火焰的马克斯坦长度影响并不显著。

关键词： constant volume bomb; natural gas engine; combustion characteristics; laminar combustion velocity; Markstein length

本文引用格式

LOU Diming , ZHU Kan , ZHANG Yunhua , REN Yedi , TAN Piqiang , FANG Liang , FAN Lanlan . Influence of Mixture Gas Conditions on the Laminar Combustion Characteristics of Natural Gas[J]. 热科学学报, 2024 , 33(3) : 1231 -1241 . DOI: 10.1007/s11630-024-1939-7

Abstract

Natural gas is a promising alternative fuel for the internal combustion engine, and natural gas engine has become an efficient and feasible measure to deal with the energy shortage and climate change. Since the laminar flame characteristics are the foundation of the turbulent flame, the laminar flame characteristics of natural gas have a significant impact on the combustion status and efficiency of the engine. A visual constant volume bomb was used to study the influence of the gas components, different excess air coefficient (λ), and initial conditions on the laminar combustion characteristics of natural gas. The experimental results showed that when the initial pressure and temperature were 0.1 MPa and 300 K respectively, compared to propane, ethane had a remarkable influence on the equivalent-combustion laminar-combustion-speed, with an average increase of approximately 5.1% for every 2.5% increase in the ethane proportion. The laminar combustion velocity of the natural gas under different excess air coefficients had a maximum value at about λ=1.0, and the Markstein length of the flame decreased with the increase of the λ. The increase in the initial pressure of the mixture resulted in a decrease in the equivalent-combustion laminar-combustion-speed of the flame, a significant decrease in the Markstein length. The increase of the initial temperature of the mixture led to a rapid increase of the equivalent-combustion laminar-combustion-speed, but the effect on the flame Markstein length was not dominant.

Key words： constant volume bomb; natural gas engine; combustion characteristics; laminar combustion velocity; Markstein length

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