明流泄洪洞掺气减蚀设施优化试验研究

Tests and study on the optimization of aeration structure of free-flow spillway tunnel

通过水工常压模型试验,对高水头、大单宽流量、小底坡龙抬头式明流泄洪洞掺气坎进行了系统的试验研究及优化试验,提出了一种新型的V形掺气挑坎。该掺气坎的空腔长度沿水流的横断面方向是连续变化的,射流挑距两边长、中间短,尽管最小空腔的长度可能已小于临界值,但由于最大空腔长度仍远大于临界值,在其作用下,便可使回流退去,空腔恢复,保证一定的通气量。这对类似工程掺气设施的合理设计有十分重要的参考意义。

Base on the normal pressure of hydraulic model experiment,a systemic optimization experiment was carried out on aeration device of freeflow spillway tunnel with high water head, large unit discharge and small base slope. A new Vtype structure and conclusion was put forward,which is quite important to the design of the similar project.