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oai:www.ideals.illinois.edu:2142/70625 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Malik, Sarmad 2014-12-15T23:55:53Z 2014-12-15T23:55:53Z 1984 1984 In the present study the flame holding mechanism for lean methane- and lean propane-air flames is examined under conditions where the recirculation zone is absent. The main objective of this work is to study the holding process in detail in an attempt to determine the mechanism of flame holding and also the conditions where this mechanism is viable and when it fails and blow-off occurs. Inverted flames held in the wake of a flat strip were studied. Experiments with different sizes of flame holders have been performed. The velocity flow field was determined using a Laser Doppler Velocimetry technique. Equation of continuity was used to calculate the flame temperature from the change in area of flow streamlines before and after the flame. Observations of the inverted flame itself were obtained using schlieren and direct photography. Results show that there are different mechanisms operative at the time of blow-off for lean propane and methane flames. Blow-off or extinction occurs for lean propane-air flame in spite of the reaction going to completion and the disparity between the heat loss and the gain in mass diffusion in the reaction zone i.e. Le < 1.0 causes the flame to blow-off. For methane-air flame the controlling factor for blow-off in incomplete reaction due to higher blowing rate leading to reduced resistance time in the reaction zone. Made available in DSpace on 2014-12-15T23:55:53Z (GMT). No. of bitstreams: 1 8422125.pdf: 4428606 bytes, checksum: edf9398aaf86418e00098f9262b3d2d4 (MD5) Previous issue date: 1984 Embargo set by: Seth Robbins for item 70791 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs UIUC only restriction lifted. Author's request and permission documented in archived Ticket # 2015102628000184. Also copied herein. Restriction lifted by kappleg2@illinois.edu 2015-11-12. Thank you for helping my son Sameer Malik in getting my Doctoral degree dissertation. It was a wonderful present for me and I thank you for your cooperation. I would like to make this document public for benefit of everybody. Therefore, please let me know what is the process that I need to follow. I do plan to visit my U of I at Urbana Champaign during next summer and reminiscence the time at the campus. Regards Sarmad Malik 4-365 Deerhurst Drive, Brampton ON L6T 5K3 ' (905) 488-6000 6 (905) 488-6002 www.weldflowmetal.com Open 200 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984. http://hdl.handle.net/2142/70625 (UMI)AAI8422125 Engineering, Aerospace An Experimental Study of Flame Holding text Aeronautical and Astronautical Engineering Aeronautical and Astronautical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.