矩形水槽中梯形边墩周围流速分布的试验研究

Experimental study of velocity profile around trapezoid cross section cylinder in rectangular open water channel

该文利用声学多普勒流速仪ADV,对矩形水槽中梯形边墩周围三维流速进行测量,并对时均流速三个方向分量进行了研究。通过对柱体周围不同垂直面和水平面流速的分析,得出水流由于受到边墩的影响,在柱体上游,行近水流与壁面产生分离,并有涡旋产生。在柱体下游,纵向水流逆向运动,产生回流,横向流速和垂向流速非常小,可以忽略。

Using the Acoustic Doppler Velocity-meter （ADV）, the three-dimensional velocity in the rectangular open water channel was measured and the three components of the time-averaged velocity were studied. Through the analyses of the velocity around the cylinder at different vertical and horizontal plane, it was found that approaching flow separated from sidewall and brought vortex owing to trapezoid cross-section cylinder influence at the upstream of the cylinder. While at the downstream of the cylinder the stream-wise water flow moved conversely and in the meantime back-flow occurred. The transverse velocity and vertical velocity are feeble and can be ignored.