円管内往復流動の研究 : 断面平均流速に関する実験と数値解析

概要

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This paper describes experimental and theoretical bulk speeds in a circular pipe for some periodically oscillating air flows produced by two pistons with arbitrary phase differences including 180°. The following facts are found for the 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 results of numerical simulation fairly well coincide with those of experiments. Therefore, the method of characteristics can predict, with good accuracy, the bulk speed of oscillating flows produced by two pistons. (2) The flows are almost axisymmetric. (3) When the piston phase difference is equal to 180°, the compressibility has no effect on the flow. But that effect becomes more remarkable as the phase difference becomes smaller from 180° to 90°. (4) If the effect of compressibility is comparatively small. the bulk speed is controlled by the time-averaged piston speed.
一般社団法人日本機械学会の論文
1987-01-25