桩柱透水丁坝的局部水头损失试验

Experimental research on local head loss associated with permeable pile groins

作为一种新型河工建筑物,桩柱透水丁坝对局部水流的影响亟需可靠的定量研究.为此,结合理论分析和水槽试验对其局部水头损失进行探讨.首先,应用平面绕流与旋涡理论阐明其局部水头损失的机理,导出了桩柱透水丁坝局部水头损失系数与阻水流量的关系式.而后利用已有的桩柱透水丁坝阻水流量计算公式结合试验资料,得到了计算单个桩柱透水丁坝在非淹没状态下局部水头损失系数的经验公式,该公式计算值与实测值符合良好,可为透水丁坝水力特性的进一步研究提供参考依据.

As a new fashion river regulation building, it is necessary to research the effect of pile permeable groins to local flow quantitatively. Based on the combination of the theoretical analysis and flume experiment, the local head loss associated with pile permeable groins is discussed. First, the mechanism of local head loss is clarified from the theory of plane flow and vortex; and the relationship between local head loss coefficient and barrier-discharge of pile permeable groins is derived. Then through combining the experiment data with the existing calculation formula for barrier-discharge, an empirical formula that can be used to calculate local head loss coefficient of pile permeable groins in the non-submerged condition is obtained. The calculation results are consistent with the experiment data. The fomula can supply reference in further research.