【作者】 张力方； 张建民；

【Author】 ZHANG Li-fang;ZHANG Jian-min;Sichuan University,State Key Laboratory of Hydraulics and Mountain River Engineering;

【机构】 四川大学水力学与山区河流开发保护国家重点实验室；

【摘要】 纵向拉伸型挑流非常适合作为峡谷河段水利工程泄水建筑物出口消能型式。窄缝挑坎能使水流沿纵向拉伸,并具有复杂三元水舌形态,在空中受掺气影响产生横向扩散。目前已有众多学者从窄缝挑坎的体型参数、出口流速,挑射角度等方面着手分析对挑距的影响,并给出经验公式;也有学者研究了空中水舌沿程横向扩散宽度的变化。文章结合挑距计算经验公式以及横向扩散宽度公式,可得出挑流水舌在下游的落点区域,并利用已建类似工程的试验数据进行了验算。结果表明,理论计算与试验值较为吻合,计算成果可供工程实践参考。更多还原

【Abstract】 Longitudinal stretched ski-jump is very suitable as the energy dissipation pattern of discharge structures of the canyon section hydraulic engineering.Slit-type bucket makes flow stretched in the longitudinal direction.The flow has complex three-dimensional nappe form.Affected by air entrainment,it is easy to diffuse in transverse.At present,many scholars have analyzed the influence of the shape parameter,outlet flow velocity,and the angle,and gived many empirical formulas.In addition,some scholars have studied the variation of the transverse diffusion width of the nappe in the air.Based on the empirical formula of ski-jump distance and transverse diffusion width,this paper can find the drop zone in the downstream area.The experimental data of similar projects have been used to verify the calculation.The results show that the theoretical calculation is consistent with the experimental value,and the results can be used for reference in engineering practice.更多还原