円管内往復流動の研究 : 管内流速分布に関する実験

概要

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This paper describes experimental velocity distributions in a circular pipe for some periodically oscillating air flows produced by tow pistons with arbitrary phase differences including 180°. The following facts are found for experimental conditions having a Reynolds number R_e=1.32×10^4-5.94×10^4 and a reduced frequency √<ω'>=10.9-18.8. (1) The turbulence appears in velocity waves for all conditions independently of the piston phase difference. (2) The instantaneous velocity distributions become almost uniform in the centre region and look like those for the steady turbulent flow regardless of the piston phase difference. (3) The velocity near the pipe wall is comparatively large in the accelerating period and comparatively small in the decelerating period independently of the piston phase difference. (4) As the piston phase difference becomes smaller from 180°to 90°, the difference of the maximum velocity and the period becomes larger between the right running flow and the left running flow.
一般社団法人日本機械学会の論文
1986-11-25