Abstract
Many studies on the stability of Bunsen flame have so far been done by many investigators. However there are little studies on the flame stability accompanied with forced secondary air flow around the burner tube. Nomaguchi and coworkers related the blow-off limits of such flames with the critical boundary velocity gradient theory at the flame base and explained the mechanism of blow-off limits. The blow-off mechanism is, however, considered to be different according to the range of secondary air flow velocity. There-fore, analyzing the data of our experiments with the Maezawa's momentum theory, the following results were obtained:(1) In the case of small secondary air flow, Gi/Go=1-kGp0.5 (1)(2) In the case of large secondary air flow, Gi/Go=1-k'Gp0.1 (2)In Eqs.(1), (2), G is the momentum of gaseous fluid and subscripts i, 0 and p show with secondary air flow, without secondary air flow and secondary air flow, respectively.
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