勾头丁坝下游流场初探

笔者的试验资料表明,勾头丁坝下游回流区及恢复区近段流速分布呈自相似性。根据相似原理,二维沿水深平均Reynolds方程可转化为常微分方程,这样就得到回流区及恢复区近段流速分布式。宽浅明槽中的试验表明,该流速分布值与实测值比较吻合。此外,本文还对紊动粘性系数沿水流方向的变化作了简要探讨。

Preliminary Study on Velocity Field Behind Hook Groyne

The velocity distribution near the region of redeveloping flow and the reeirculating region behined the hook groin structure is found to be self-preserving in character from test data. The two-dimensional Reynolds'equation is transformed into an-ordinary differential equation by similarity considerations, and the equation of velocity distribution near the region of rocireulating flow and the redeveloping region is Obtained. It's proved from test in wide and shallow open channal that the values by the derived equation are in close agreement with the measurements. In addition, this paper also briefly study the trubulent viscosity along the mean flow direction.