円すい広がり管内の脈動流れ(流体工学,流体機械)

概要

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An experimental investigation was made of the pulsating turbulent flow in conically divergent tubes with divergence angles of 12, 16 and 24°. The experiments were carried out under the conditions of the Womersley numbers of α=10〜40, the mean Reynolds numbers of Re_<ta>=15000〜30000 and the oscillatory Reynolds number of Re_<os>=10000 (the flow rate ratios of η=0.33〜0.67). Time-dependent wall static pressure and axial velocity were measured at several longitudinal stations and the distributions were illustrated for representative phases within one cycle. The experimental results of the rise between the pressure at the inlet and the outlet of the divergent tube almost agree with the approximate results, which are derived under the assumption of a quasi-steady flow. The profiles of the phase-averaged velocity and the turbulence intensity in the cross section are quite different from those of a steady flow and also they show complex changes along the tube axis in each of the accelerative and decelerative phases.
一般社団法人日本機械学会の論文
2004-06-25