抄録
An experimental investigation was conducted of the pulsating turbulent flow through a 90-degree bend with a circular cross section. The experiments were carried out under the conditions of Womersley number α=20, mean Reynolds number Re_<ta>=20000 and oscillatory Reynolds number Re_<os>=10000 (the flow rate ratio η=0.5). Time-dependent wall static pressure and axial and secondary flow velocities were measured at several longitudinal stations and the distributions were illustrated for representative phases. The distributions of the phase-averaged velocity are very different from those for steady flow. Furthermore, they show complex changes along the tube axis.
