二次元噴流の垂直衝突領域における乱れ特性

概要

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A Turbulent air jet is used widly in the industrial fields, particularly its turbulence plays an important role in the heat transfer or torch combustion. In the impingement region of such a jet flow, however, it is very difficult to measure precisely the velocity components and turbulence intensity. In the paper, X and I type probes of Hot-Wire anemometer (H. W.) are used to measure the time-mean velocity of a fully developed air jet flow impinged vertically onto a flat wall. Such results are summarized as follows. (1) The turbulence energy on the jet axis is proportional to distance from the wall regardless of the impinging height. (2) The turbulence energy distributions along the wall and jet axis are similar independently of the impinging height. (3) The distributions of power spectrum in higher frequency range are in propotion to Kolmogorov -5/3 power law. (4) The integral scale of turbulence is small near the wall, but larger at the center of impingement region or far away from the jet axis.
東海大学の論文