U形渠道断面流速分布规律的初步研究

Discussion of Velocity Profile in Open Channel with U-shaped Cross-section

通过对U形渠道断面流速分布进行理论分析和试验研究,发现断面内最大流速发生在水面以下,综合国内外学者使用不同的流速仪对矩形明渠和复式断面明渠的试验资料,得出最大流速发生在水面以下是由于二次流的存在引起的。分析水槽实测流速,发现由于最大流速发生在水面以下,使得中垂线流速分布与对数律流速分布形式和抛物线形式拟合曲线都有一定的偏差。

Based on the theoretical analysis and experimental investigation in open channel with U-shaped crosssection, it is found that the position whereby the maximum velocity appears below the water surface because the secondary currents, and found the velocity distribution in vertical have deviation from log law and parabola function.