710 円形噴流初期領域における二次フィルム流の影響 : 二次フィルム流による速度分布及びエントレンメントの変化(流体工学II)

概要

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Influences of adding thin annular flow to the main jet was studied experimentally in jet initial field. The thin annular flow defined the secondary film flow. The secondary film flow slit gap is 0.5mm. And the inside diameter of main jet is 8mm. The main jet was used Carbon dioxide. The secondary film flow was used Helium and Air. Velocity distributions were measured by the LDV. Jet velocity was set up so that the main jet might become Re=2000 (2.06m/s). The secondary film flow was set as velocity ratio was become from 0 to twice to the velocity of main jet. And entrainment change was calculated on jet velocity. As a result, Helium was more effective than Air in lengthening of potencial core. And the entrainment was controled at the secondary film flow.
一般社団法人日本機械学会の論文
2000-10-03