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Journal of Thermal Science

, Volume 29, Issue 1, pp 90–97 | Cite as

Numerical Study on the Morphology of a Re-Ignited Laminar Partially Premixed Flame with a Co-Axial Pilot Flame

  • Zejun WuEmail author
  • Yinhu KangEmail author
  • Xiaomin He
Article
  • 21 Downloads

Abstract

Re-ignited partially premixed flame (PPF) is a quite extensive flame type in real applications, which is directly relevant to the local and global extinction and re-ignition phenomenon. The authors designed a model burner to establish laminar re-ignited PPFs. Numerical simulations were carried out to reveal the morphology of laminar re-ignited PPF. Based on the distributions of temperature, heat release and radicals, the morphologies of re-ignited flames were explored. W-shaped flames were formed under pilot-lean conditions. Line-shaped and y-shaped flames were formed under pilot-rich conditions. Both w-shaped and y-shaped flames had a triple-flame structure. The re-ignited flames can stand beyond the rich flammability limit. Additionally, OH distributions indicated both pilot flame and re-ignited flame well as it rapidly increased near the flame front. OH concentration did not increase visibly while CH2O concentration mildly increased during the mild re-ignition process in the pre-zone of the re-ignited PPF. According to the results of 0-D simulations using closed homogeneous reactor, both OH and CH2O reduced ignition time significantly. The results of this work are helpful for understanding re-ignited PPF more closely.

Keywords

re-ignited flame partially premixed flame flame morphology numerical simulation 

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Notes

Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (No. 106112017CDJXY320001), the open funds of Jiangsu Province Key Laboratory of Aerospace Power System (No. CEPE2018009) and National Natural Science Foundation of China (No. 51706027).

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Aerospace EngineeringChongqing UniversityChongqingChina
  2. 2.School of Energy and Power EngineeringChongqing UniversityChongqingChina
  3. 3.Jiangsu Province Key Laboratory of Aerospace Power SystemNanjingChina
  4. 4.College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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