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.
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References
Law C.K., Combustion physics. Cambridge University Press, New York, 2006.
Aggarwal S.K., Extinction of laminar partially premixed flames. Progress in Energy and Combustion Science, 2009, 35: 528–570.
Neumeier Y., Weksler Y., Zinn B., Seitzman J., Jagoda J., Kenny J., Ultra low emissions combustor with non-premixed reactants injection. 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Tucson, Arizona, 2005. DOI: https://doi.org/10.2514/6.2005-3775.
Gopalakrishnan P., Effects of the reacting flowfield on combustion processes in a stagnation point reverse flow combustor. Georgia Institute of Technology, Ann Arbor, 2008.
Undapalli S., Srinivasan S., Menon S., LES of premixed and non-premixed combustion in a stagnation point reverse flow combustor. Proceedings of the Combustion Institute, 2009, 32: 1539–1544.
Gan Y., Song J., Zeliang Y., Minglun J., Zheng H., Experimental investigation into small-scale jet diffusion flame structure. Journal of South China University of Technology, 2011, 39(3): 73–77.
Wu Y., Ye T., Lin Q., Mult-dimensional flamelet generated manifolds for combustion simulation with multi-regime flame structure. Journal of Propulsion Technology, 2015, 36(6): 816–823.
Hewson J.C., Kestein A.R., Local extinction and reignition in nonpremixed turbulent CO/H2/N2 jet flames. Combustion Science and Technology, 2002, 174: 35–66.
Lignell D.O., Chen J.H., Schmutz H.A., Effects of Damköhler number on flame extinction and reignition in turbulent non-premixed flames using DNS. Combustion and Flame, 2011, 158: 949–963.
Santoro V.S., Gomez A., Extinction and reignition in counterflow spray diffusion flames interacting with laminar vortices. Proceedings of the Combustion Institute, 2002, 29: 585–592.
Amantini G., Frank J.H., Bennett B.A.V., Smooke M.D., Gomez A., Comprehensive study of the evolution of an annular edge flame during extinction and reignition of a counterflow diffusion flame perturbed by vortices. Combustion and Flame, 2007, 150: 292–319.
Venugopal R., Abraham J., A 2-D DNS investigation of extinction and reignition dynamics in nonpremixed flame-vortex interactions. Combustion and Flame, 2008, 153(3): 442–464.
Weigand P., Meier W., Duan X.R., Stricker W., Aigner M., Investigations of swirl flames in a gas turbine model combustor I. Flow field, structures, temperature, and species distributions. Combustion and Flame, 2006, 144(2006): 205–224.
Meier W., Duan X.R., Weigand P., Investigations of swirl flames in a gas turbine model combustor II. Turbulence-chemistry interactions. Combustion and Flame, 2006, 144(2006): 225–236.
Bennett B.A.V., Mcenally C.S., Pfefferle L.D., Smooke M.D., Computational and experimental study of axisymmetric coflow partially premixed methane/air flames. Combustion and Flame, 2000, 123: 522–546.
Zhou R., Hochgreb S., The behaviour of laminar stratified methane/air flames in counterflow. Combustion and Flame, 2013, 160: 1070–1082.
Won S.H., Windom B., Jiang B., Ju Y., The role of low temperature fuel chemistry on turbulent flame propagation. Combustion and Flame, 2014, 161: 475–483.
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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Wu, Z., Kang, Y. & He, X. Numerical Study on the Morphology of a Re-Ignited Laminar Partially Premixed Flame with a Co-Axial Pilot Flame. J. Therm. Sci. 29, 90–97 (2020). https://doi.org/10.1007/s11630-019-1249-7
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DOI: https://doi.org/10.1007/s11630-019-1249-7