二次元噴流のコヒーレント構造発展に関する実験的研究 : 第1報,2点空間速度相関分布とKL展開による固有モードの解析(流体工学,流体機械)

概要

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To investigate the development of coherent structure in a turbulent plane jet, the simultaneous measurement of the velocities at two points with X-type hot wire probes has been preformed in three regions of the plane jet (i.e. the potential core region, the interaction region and the self-presserving region). The KL expansion (POD) was applied to the velocity data, and the development of coherent structure was investigated with respect to the eigenvalues and eigenfunctions as well as the spacial velocity correaltions. From the distributions of the eigenvalues, it is found that the first and second mode in the potential core region are dominant in the kinetic energy and they show almost the same magnitude. The profiles of the eigenfunctions downstream of the interaction region show that the first mode of main streamwise velocity u is asymmetrical about the jet centeline whereas the one of cross-streamwise velocity νis symmertical. These results are consistent with the feature of the correlation coefficient of the two velocity signals on opposite sides of the jet cenerline.
一般社団法人日本機械学会の論文
2004-09-25