0202 入口区間の非定常管内乱流(OS2-1 乱流の計測・解析・制御,オーガナイズドセッション)

概要

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The purpose of the study is experimentally investigating effects of the flow behavior and the flow resistance that the acceleration and the inlet shape exerted. The experiments were performed under ranges from rest to Reynolds number Re=4×10^4, with two kinds of acceleration and two kinds of inlet shape. The flow behavior and wall shear stress are measured by the three hot wire type probe and surface probe in test section. The unsteady flow maintains the laminar over the critical Reynolds number in steady state (Re=2300), and then the time of transition to turbulent delaying from the inlet to downstream. This is caused by flow rate increases without disturbance in the accelerating flow, turbulence generated at the inlet convection to downstream by the mainstream. Therefore, its transition time in inlet region is decided by time when turbulence is generated near an inlet.
一般社団法人日本機械学会の論文
2009-11-06