长江科学院院报Issue(8)：57-60,4.DOI:10.3969/j.issn.1001-5485.2015.08.010
台阶式溢洪道滑掠流时均压强影响因素分析
Factors Affecting Time-averaged Pressure of Skimming Flow in Stepped Spillways
杨吉健 1刘韩生 1张为法2
作者信息
- 1. 西北农林科技大学 水利与建筑工程学院，陕西 杨凌 712100
- 2. 中国电建西北勘测设计研究院有限公司，西安 710065
- 折叠
摘要
Abstract
As stepped spillway has special structure and complex flow patterns,researches on the pressure in stepped spillway are not consistent.In view of this,we investigate into the effects of flow discharge,air entrain-ment,step size and spillway’s slope gradient on the distribution of time-averaged pressure through analysing the pressure data of skimming flow in several stepped spillways.Results reveal that big discharge per unit width leads to big time-averaged pressure.Air entrainment could effectively reduce positive time-averaged pressure and increase negative pressure.Effect of the step size is complicated:when the step size is small with gentle slope,pressure is small in the middle but large on both ends in vertical plane of the step;when step size is small with steep slope, minimum pressure occurs on the bottom and top of step in vertical plane;while when the step size is large,pressure decreases from the bottom to the top,and pressure variation intensifies with the increase of slope gradient.关键词
台阶式溢洪道/空蚀破坏/滑掠流/时均压强/单宽流量/掺气Key words
stepped spillway/cavitation damage/skimming flow/time-averaged pressure/discharge per unit width/aeration分类
建筑与水利引用本文复制引用
杨吉健,刘韩生,张为法..台阶式溢洪道滑掠流时均压强影响因素分析[J].长江科学院院报,2015,(8):57-60,4.
