Abstract
Standardized burning velocity and blowoff measurements for methane-air, ethane-air, propane-air, butane-air, and ethylene-air flames are reported. The experimental data relate to inverted flames stabilized on thin plates and to flames stabilized on cylindrical burner rims. The equation Kb = kgbpcSu2 is used to interpret these data in terms of the flame stretch concept.Blowoff of inverted flames from a very thin (0.030-cm) stabilization plate occurs at an approximately constant value of Kb = 0.95 ± 0.15q irrespective of mixture composition. It thus seems probable that blowoff of these inverted flames occurs as a result of excessive flame stretch in the stabilization zone.Blowoff of cylindrical burner flames does not apparently occur at a constant value of Kb, even when secondary combustion is eliminated. However, with these flames there are systematic errors in the determination of Su and gh, in the stabilization zone. The local burning velocity will tend to be increased by secondary combustion and decreased by dilution with the atmosphere. Thus Su may be overestimated or underestimated by intdeterminate amounts, and gh is overestimated because flattening of the velocity gradient downstream of the burner rim is neglected. These systematic errors prevent a satisfactory test of the flame stretch theory of blowoff.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
