A STUDY ON OPPOSED GASEOUS JET FLAMES STABILIZED IN A UNIFORM AIRSTREAM : 1ST REPORT : DEVELOPMENT OF ISOTHERMAL OPPOSED JETS

概要

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As the first step to elucidate the mechanism of combustion and stabilization of an opposed gaseous jet flame in a uniform airstream, this paper describes theoretical and experimental results of the development of the jet issued into the same fluid flow without combustion. The part of the jet can be divided into three regions termed the initial region, the fully developed mixing region and the U-turn region. The theoretical analysis shows that the results for the spread of the jets with different excess-velocity ratio can be collapsed into a single universal curve by introducing the excess-momentum radius. In the fully developed mixing region good agreement between such a theory and experimental results is obtained provided a virtual origin of jet is placed at an appropriate distance upstream of the nozzle exit. Thus the excess-momentum radius is confirmed to be a characteristic length of the opposed jet.
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