開口部がラッパ形の円管内入口付近における振動流れ(流体工学,流体機械)

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Numerical investigations have been made of the oscillatory entrance flow in a straight pipe connected perpendicularly to the wall of a large reservoir. The pipe opening forms a bell mouth, the roundish corner radius of which is the same as the pipe. Calculations are carried out under the conditions of the Womersley numbers of α=2〜20 and the Reynolds numbers of Re=100〜500. The velocity profiles, the streamlines and the distributions of the wall shear stress are illustrated. The influences of the Womersley number and of the configuration of the pipe opening on the entrance flow phenomena are made clear, as occasion calls, by referring to results for a pipe with a sharp edged opening. The flow near the inlet in the outflow as well as the inflow terms exhibits a complicated behavior depending on the Womersley number. The separation at the bell mouth in the outflow term comes to be suppressed with an increase of α. In place of that, for moderate and high α the vortex flow is formed just in front of the bell mouth at the phase that changes from the outflow to the inflow terms. In consequence of the developing of the axial velocity along the pipe axis, the one-directional or bi-directional steady steaming is induced in the entrance region. The inlet length determined from the amplitude of the axial velocity is appreciably shorter than that for a steady flow and it changes proportionately with Re/α^2, except for sufficiently high α.
一般社団法人日本機械学会の論文
2002-03-25

開口部がラッパ形の円管内入口付近における振動流れ(流体工学,流体機械)

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