【摘要】 应用平面激光诱导荧光 (PLIF)技术观测了水槽中半圆柱形及正弦形半岛后紊动尾流的瞬时浓度分布。对浓度等值线图形进行的分维测量表明紊动尾流具有分形特性 ,且在同一形状半岛后尾流各时刻的分维数不随尾流的周期性摆动而变。同时还研究了分维数与不同的浓度等值线、雷诺数和半岛形状的关系。更多还原

【Abstract】 The instantaneous concentration distribution of the turbulent wakes behind semicircular and sinusoidal peninsula in experimental flume are measured by applying planar laser induced fluorescence(PLIF) technique.The measurement results of fractal dimensions for the concentration isogram indicate that turbulent wakes have fractal nature,and the fractal dimensions of a same shaped peninsula in different time are not changed with the cyclical fluctuation of wakes.The relations between the fractal dimension and the different concentration isogram,the Reynolds number,the peninsular shape are also researched.更多还原