D104 光学測定法による水噴流自由界面特性の実験的評価(OS10 混相流動)

概要

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Free surface fluctuations at the neighboring two locations on a water jet have been measured using the non-intrusive optical technique. The instantaneous free-surface slope angle is evaluated by detecting the two dimensional trajectories of laser beams refracted at the jet free surface. The obtained time series data of slope angle is divided into each wave period according to zero-up-crossing method. The individual wave speed is evaluated from the dominant time lag of cross-correlation coefficient. Moreover, the spatial shape of each wave is reconstructed by integrating slope angle data. By comparing the statistical property of spatial wave shapes and the observation of jet free surface, it is found that the wave steepness reaches a maximum in the free surface region where a periodic wave pattern breaks down into less regular three dimensional pattern. And the probability density function of non-dimensional wave height also approximates to the Rayleigh distribution downstream this region.
一般社団法人日本機械学会の論文
2009-06-28