気柱振動流場における円柱周りの流れの可視化

概要

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The experimental investigation of flow visualization around a circular cylinder in the oscillatory flow was carried out. The test cylinder was installed on the center of the passage in the closed pipe with the oscillatory air column. The oscillatory flow near the resonance of air column was produced by a pump which was composed of a crank and piston mechanism as an oscillator. The frequency of the oscillator was changed in the range of 10 to 22.5Hz, and the amplitude of the oscillator was 25mm. The velocity and pressure in the oscillatory flow were measured by the hot wire anemometer and the pressure transducer respectively. The flow visualization around the test cylinder in the oscillatory flow was carried out by using the laser light sheet method and the smoke wire method. The digital images for the flow visualization around the test cylinder were taken by a high speed camera. As a result, it was proved that the convective heat transfer characteristics around the test cylinder were influenced by the velocity of the main flow and the behavior of vortices, which were formed, moved and then broken down, near the test cylinder in the oscillatory flow.
福山大学の論文