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An Experimental Study of the Effect of Partial Premixing Level on the Interaction between the Flame Kernel and Flow Field
Ayman Moustafa Elbaz, Mohy Mansour, Khaled A. Elsayed, Diaaeldin Mohamed
Pages - 9 - 22     |    Revised - 15-05-2013     |    Published - 30-06-2013
Volume - 4   Issue - 1    |    Publication Date - June 2013  Table of Contents
Flame Kernel, Partial Premixed Flame, PIV, Flow Field
Flame kernels in spark-ignited combustion systems dominate the flame propagation and combustion stability, performance and emissions. The aim of the present work is to investigate the flow field associated with flame kernel propagation history in partial premixing natural gas turbulent flames. The main parameters under investigation are the degree of partial premixing and jet velocity. Three different degrees of partial premixing and five values of jet velocity between10 and 20 m/s have been selected for the present work at an equivalence ratio of 2. The mean flow field and turbulence intensity are measured using two-dimensional Planar Imaging Velocimetry (PIV). A pulsed Nd: YAG laser is used for flame ignition. The turbulent flow field is captured after the ignition at several time intervals between, 150, and 2500 ?s after ignition. The results show that the flame kernel does not show any significant effect on the scale of mean flow field. On the other hand, the flame kernel increases the global turbulence intensity in flames in comparison with the isothermal cases. The flame kernel propagation is associated with a steep increase in the centerline turbulence intensity of the jet flow. An increase in the degree of partial premixing and/or the jet velocity increases the centerline turbulence intensity accompanying the flame kernel propagation. This leads to break-up of the degree of partial premixing of the flame structure, and hence, decreased flame stability. Also, the higher the degree of partial premixing or the higher the jet velocity leads to more rapid flame kernel extinction. The results show that the rate of flame kernel propagation is very fast at the early stage of the kernel propagation up to the first 300 ?s and then it slows down afterwards.
CITED BY (2)  
1 Mansour, M. S., Elbaz, A. M., & Zayed, M. F. (2014). Flame Kernel Generation and Propagation in Turbulent Partially Premixed Hydrocarbon Jet. Combustion Science and Technology, 186(4-5), 698-711.
2 Barré, D. (2014). Numerical simulation of ignition in aeronautical combustion chambers (Doctoral dissertation).
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Dr. Ayman Moustafa Elbaz
University of Helwan - Saudi Arabia
Professor Mohy Mansour
Faculty of Engineering/Mechanical Power Engineering Department, Cairo University Cairo - Egypt
Mr. Khaled A. Elsayed
Faculty of Science/Physics Department, Cairo University Cairo, Egypt - Egypt
Mr. Diaaeldin Mohamed
Faculty of Engineering/Mechanical Power Engineering Department, Cairo University Cairo, Egypt - Egypt

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