桥墩紊流宽度的试验研究

Experimental study of turbulent width at piers

通过概化水槽试验,采用M icroADV流速仪测量瞬时流速,得到桥墩周围纵向、横向和垂向时均流速和紊流强度的横向分布.比较了有、无桥墩的时均流速和紊流强度横向分布变化,得出桥墩对时均流速和紊流强度的影响幅度和范围,据此确定桥墩侧边缘的紊流宽度,并给出了桥墩最大紊流宽度随断面平均流速变化的关系.

By conceptual flume experiments, the longitudinal, lateral and vertical time-average velocity and lateral distribution of turbulent intensity around a pier are presented by using a Micro Acoustic-Doppler Velocimeter （MicroADV） to measure the instantaneous velocity. Comparison of time-average velocity and lateral distribution of turbulent intensity with and without piers is carried out, influences of the pier on time-average velocity and turbulent intensity are presented, turbulent width at the edge of a pier and the relationship between the maximum width of turbulent and mean velocity in section are also presented.