環状吸込流を付加した円形衝突噴流の流動特性に及ぼす吹出し管助走長さの影響  [in Japanese] EFFECTS OF LENGTH OF INJECTION PIPE ON FLOW CHARACTERISTICS OF CIRCULAR IMPINGING JET ACCOMPANYING ANNULAR SUCTION FLOW  [in Japanese]

The experiments were carried out to clarify the effects of various length of the injection pipe on the flow characteristic of a circular impinging jet accompanying an annular suction flow. As a result, it is found that there is seldom the effect on the power loss in spite of various inside diameter and excess length of the suction pipe. However, the fluctuating velocity measured using PIV increases a little in the exit edge vicinity of the injection pipe near the shear layer, when the length of the injection pipe shortens. And, though the mean pressure and the fluctuating pressure at the stagnation point decreases a little, the improvement of the Nusselt number does not change very much.

The experiments were carried out to clarify the effects of various length of the injection pipe on the flow characteristic of a circular impinging jet accompanying an annular suction flow. As a result, it is found that there is seldom the effect on the power loss in spite of various inside diameter and excess length of the suction pipe. However, the fluctuating velocity measured using PIV increases a little in the exit edge vicinity of the injection pipe near the shear layer, when the length of the injection pipe shortens. And, though the mean pressure and the fluctuating pressure at the stagnation point decreases a little, the improvement of the Nusselt number does not change very much.