ハーフトリップを用いた90°ベンド内流れの抵抗低減(流体工学,流体機械)

概要

論文の詳細を見る
In order to reduce pressure loss and asymmetry, a flow control device was applied to the complex flow field in a 90-degree bend pipe : a trip wire was attached on the inside wall of the curve at appropriate upstream position to the 90-degree bend. The trip device spans half circumferential length, that is, it is called as "half-trip" in the present experiment. To see ability of the device to control the complex flow, pressure loss, axial mean velocity profile and secondary current were measured for Reynolds number range Re=50000-82000. The experiment was made with relatively small rate of curvature to pipe radius 2R/D=1.43. Wall static pressure measurements certainly show that the half-trip is effective to reduce pressure loss as well as asymmetry of the axial mean velocity at exit of the bend pipe. The maximum reduction rates of pressure loss coefficient is 23% for trip device height k=3.0mm and 5.0mm. A possible mechanism is discussed with available experimental evidences of axial velocity, secondary velocity vectors and oil film pattern observations.
一般社団法人日本機械学会の論文
2003-03-25