同軸二重円管噴流に関する研究 : 第1報,外側ノズル長さの影響について

概要

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The double coaxial pipe jets which consist of a contral round air jet (an inner jet) and an annular air jet (an outer jet) have been experimentally investigated. The outer jet has a potential core and a constant velocity. The inner jet from an inner long pipe is induced by the subatmospheric pressure near the inner nozzle edge, and its jet velocity is always lower than the outer. Five different configurations of the outer nozzle are tested in order to examine their effects on the development of the jet flow. Detailed measurements of the mean-velocity, turbulent intensity and Reynolds stress distributions have been made. For various nozzle lengths, the mean-velocity profiles show similarity in both the outer and the inner mixing regions, and the turbulent intensity profiles also show similarity in the outer mixing region. Turbulence is found to be produced form three different edges with the individual characteristics. For all nozzles, the velocity distributions become almost the same, i. e. a distance of fifteen times the outer nozzle diameter from the inner edge.
一般社団法人日本機械学会の論文
1989-12-25