円管内等加速度流れにおける乱流遷移と速度分布

概要

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A change in the distributions of the axial velocity component associated with transition to turbulence in a constant-acceleration pipe flow has been experimentally investigated. Air is used as the working fluid. The axial velocity component of air flow in the pipe is measured with a hot-wire anemometer. The amplification of disturbance and transition to turbulence are judged based on the velocity signal, the RMS value of velocity fluctuation, and the wavelet analysis of the velocity signal. The measurements are carried out for acceleration greater than the value indicating the boundary between the low and high acceleration regimes. The velocity distributions in the developing region of the pipe are found to be very sensitive to the acceleration and the axial position.
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