平行二円板流入部はく離泡の入口丸み半径による影響

概要

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An annular separation bubble that appears around the inlet corner of a radial diffuser flow between two parallel disks is investigated using flow visualization technique and numerical simulation of Navier-Stokes equations. The parameters of the flow are the radius of the inlet corner r_c, the clearance between parallel disks H, and the Reynolds number Re≡v_0d_p/ν, where v_0, d_p and ν are mean velocity at the inlet pipe, the diameter of the pipe and kinematic viscosity, respectively. The effects of the parameters on the separation bubble are considered. (1) The radius of the reattchment point r_R, and the height of the bubble h_s increase with Re in the laminar regime, but do not change in the turbulent regime. (2) r_R and h_s decrease with increasing r_c. The critical Reynolds number of the separation Re_<cs> increases with r_c. (3) Both r_R and h_s increase with H, to r_R has a larger increase than h_s.
1996-12-25