G307 回転するヘリカルな流路内流れの実験的研究 : 二次流れと摩擦係数に及ぼす捩りの効果(GS3-2 回転を伴う流れ2,一般セッション)

Abstract

An experimental study is performed to examine the characteristics of fluid flow in a helical rectangular channel. Seven types of torsion of the channel are made to investigate the torsion effect on the flow characteristics. Three walls (rotor wall) of the channel rotate around the center of curvature. We measure the flux through the channel at a constant rotor speed by changing the pressures at the entrance and exit of the channel. We also observe the secondary flow at a cross-section of the channel. The friction factor along the channel to get the same flux is large for large channel torsion at a constant rotation, and becomes small when the favorable rotation of the rotor to the flow is applied. Several types of secondary flow are found. In case of the large torsion and rotation, the secondary flow becomes an unsteady flow patterns.