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CO2-diluted CH4-air premixed spherical flames with microwave-assisted spark ignition

CO2稀释条件下微波辅助点火对早期甲烷空气球形火焰的影响

  • The 2nd World Congress on Internal Combustion Engines
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Abstract

The performance of microwave-assisted spark ignition (MAI) under exhaust gas recirculation conditions was explored with CO2-diluted CH4-air premixed spherical flames in a constant volume combustion chamber. The flame kernel radius at 5 ms after spark started was selected to evaluate the property of MAI for CO2 dilution ratio of 0–20% and equivalence ratio of 0.6–1.4 with 1 kHz microwave pulse repetition frequency under 0.2 MPa ambient pressure. The results showed that the addition of microwave induced some wrinkles on the flame surface and strongly deformed the flame. MAI expanded the limit of CO2 dilution ratio to 16% with an equivalence ratio of 0.75, in which case the spark only (SI) failed to ignite the mixture. With the CO2 dilution ratio increasing, the wrinkles induced by microwave pulses decreased apparently, and the enhancement value of MAI peaked at 4% CO2 dilution ratio. The effect of microwave was considered in two aspects, namely, reaction kinetics and thermal effect, which shows a “trade-off” as CO2 dilution ratio rose. With 8% volume of CO2 added, the flammable interval (equivalence ratio 0.6–1.2) of mixture in SI mode shrunk, and MAI can maintain a flammable interval consistency with the case that no CO2 was added.

摘要

在定容燃烧弹中利用甲烷空气球形火焰探索了微波辅助点火(MAI)技术在CO2稀释条件下的点火性能。通过对比环境压力0.2 MPa下点火后火焰核心半径以及形貌等特征,评估了MAI在CO2稀释比0∼20%以及当量比0.6∼1.4 范围内较火花点火(SI)模式的增强效果。试验结果表明,脉冲重复频率为1 kHz 的微波可以在火焰表面诱发褶皱并使火焰明显变形。在当量比0.75 的条件下,采用MAI模式将CO2稀释比极限拓展到了16%,而在此条件下SI 模式无法点燃混合气。随着CO2稀释比由0 增大到16%时,微波诱发的火褶皱愈发不明显,而微波对火焰半径的增量在CO2稀释比为4%时达到峰值。这被认为是随着CO2稀释比的增加,微波引起的反应动力学增强与热效应之间此消彼长共同作用的结果。8%的CO2稀释比明显缩小了SI 点火的可燃当量比范围,而MAI可以维持相同的点火当量比范围。

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Authors and Affiliations

  1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xin-hua Zhang  (张新华), Zhao-wen Wang  (王兆文), Hui-min Wu  (吴慧珉), Chao-hui Liu  (刘超辉), Zhi-hao Wang  (王志豪), Xiao-jie Li  (李晓捷) & Xiao-bei Cheng  (成晓北)

  2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Xin-hua Zhang  (张新华), Zhao-wen Wang  (王兆文), Hui-min Wu  (吴慧珉), Chao-hui Liu  (刘超辉), Zhi-hao Wang  (王志豪), Xiao-jie Li  (李晓捷) & Xiao-bei Cheng  (成晓北)

  3. Department of Mechanical Engineering, University of California-Berkeley, Berkeley, CA, 94720, USA

    Jyh-Yuan Chen

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  1. Xin-hua Zhang  (张新华)
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Contributions

WANG Zhao-wen, CHENG Xiao-bei and CHEN Jyh-Yuan provided the concept and edited the draft of manuscript. ZHANG Xin-hua conducted the literature review and wrote the first draft of the manuscript. WU Hui-min and LIU Chao-hui conducted the ignition tests and recorded the flame developing data. WANG Zhi-hao and LI Xiao-jie analyzed the recorded data. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Zhao-wen Wang  (王兆文).

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Foundation item: Project(KF2028) supported by the State key Laboratory of Automotive Safety and Energy, China; Project(KF2028) supported by the State Key Laboratory of Automotive Safety and Energy, China

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Zhang, Xh., Wang, Zw., Wu, Hm. et al. CO2-diluted CH4-air premixed spherical flames with microwave-assisted spark ignition. J. Cent. South Univ. 29, 2157–2164 (2022). https://doi.org/10.1007/s11771-022-5043-4

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  • DOI: https://doi.org/10.1007/s11771-022-5043-4

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