矩形明渠中矩形边墩周围紊动强度和雷诺应力分布特性试验

Experimental study on turbulence intensity and Reynolds stress around rectangular cross-section cylinders in rectangular open channels

利用声学多普勒流速仪(ADV)测量矩形断面明渠中矩形边墩周围不同垂线、不同测点的瞬时流速,计算出水质点的三维相对紊动强度和雷诺应力,分析其变化特征。试验表明,紊动强度和雷诺应力在边墩周围明显增大且具有相类似的分布特征。该研究可为水流的紊动结构、丁坝与桥梁矩形边墩的水流紊动特性和冲刷机理提供验证资料。

The acoustic Doppler velocimeter （ADV） was employed to measure the instantaneous velocities of different vertical lines and measuring points around a rectangular cross-section cylinder in a rectangular open channel. The three-dimensional relative turbulence intensity and Reynolds stress of water particles were calculated, and their variation characteristics were analyzed. The experimental results indicate that the turbulence intensity and Reynolds stress obviously increase near the cylinder and their distribution characteristics are similar. The present study may provide test data for the turbulent structure of flows and the turbulence characteristics and scour mechanism of rectangular cross-section cylinders such as bridges and spur dikes.