[关键词]
[摘要]
在跌坎型底流消能工消力池内水流流态分区的基础上, 根据自由紊动射流理论, 得出不同入射角度下冲击区时 均动水压强半经验公式。利用冲击区底板时均动水压强分布图, 在角度和流量不变的工况下, 跌坎的变化对底板时均 动水压强的影响, 以及角度跌坎不变的工况下, 流量的变化对底板时均动水压强的影响, 显示出冲击区最易遭受冲磨 与破坏的区域。以某水库工程为例, 由实测数据推求经验公式相关参数, 验证经验公式的可行性, 进一步结合临底 流速求出消力池底板混凝土抗冲磨强度分布图, 对底板分区, 为合理确定消力池底板混凝土强度等级提供参考。
[Key word]
[Abstract]
On the basis of creating water flow regime partitions in the impact zone of bottom2flow dissipation with step 2down floor and the theory of free turbulent jet flow, an empirical formula of time 2averaged dynamic water pressure in the impact zone was obtained under different incident angles. The distribution diagram of dynamic water pressure in the impact zone was ana 2 lyzed using matlab. The effects of step 2down floor on the dynamic water pressure under the same incident angle and flow rate, and the effects of incident flow rate on the dynamic water pressure under the same incident angle and step 2down floor were in2 vestigated, and the most vulnerable area to damage and abrasion in the impact zone was determined. A reservoir project was se 2 lected as the case study. The relevant parameters of the empirical formula were deduced based on the measured data to verify the feasibility of the empirical formula. With the knowledge of the bottom velocity, the abrasion resistance strength of concrete floor in the impact zone of bottom2flow dissipation was obtained. The research can provide reference for the strength classification of concrete floor of bottom2flow dissipation.
[中图分类号]
[基金项目]
国家自然科学基金项目/ 跌坎型底流消能工水流流动结构水力特性研究0( 51169088)