基于消力井直径变化下竖井溢洪道压强特征试验研究  

Experimental study on pressure characteristics of shaft spillway with different diameter of stilling well

作　　者：张宗孝[1] 刘冲[1] 白欣[1] 陈小威[1] 

机构地区：[1]西安理工大学水利水电学院,西安710048

出　　处：《应用力学学报》2018年第3期510-516,共7页Chinese Journal of Applied Mechanics

摘　　要：为研究消力井直径变化下竖井溢洪道内部各个重要部位的压强特征,在满足泄洪能力的前提下,保持消力井井深不变,分别对直径D0=6.5m、D0=9.1m、D0=11.05m三种方案进行水工模型试验,研究分析了洞内环形堰面段、竖井段、底板段、压坡段的沿程时均压强特征、脉动压强参数。试验结果表明:环形堰面段在自由堰流时时均压强随堰上水头变化幅度不大,而在淹没堰流时各测点时均压强趋于静水压强沿程逐渐增大趋势;竖井段下部时均压强随堰上水头呈增大趋势;底板段和压坡段时均压强随直径的增大呈现减小趋势,但减小幅度不大;在不同直径下消力池底板的优势频率都出现在2Hz内,属于低频率范围,不会对底板产生共振破坏现象。In order to investigate the pressure characteristics of every component in shaft spillway with different diameter of stilling well, under the premise of meeting flood discharge capacity, three cases of diameter D0=6.5 m, D0=9.1 m, D0=11.05 m, of the stilling wells are tested, with the depth of stilling well remains the same, then the time-averaged pressure characteristics and pulsating pressure parameter on face of circular inlet, on the wall of stilling well, in the bottom of stilling well, pressure slope are analyzed. The results show that the tine-averaged pressure of each measuring point does not change too much as the weir head charges under the circumstance of free weir flow on face of circular inlet. However, the time-averaged pressure of each measuring point gradually increases as the hydrostatic pressure increases; the time-averaged pressure on the wall of stilling well gradually increases as the weir head increases; the time-averaged pressure in the bottom of stilling well and on top-plane of pressure slope have a decreasing tendency as the increase of diameter, but the decreasing amplitude is not so obvious; the advantage frequencies under different diameter at the bottom of stilling well focus on 2 Hz which belongs to the category of low frequency, thus it does not cause resonance phenomenon to the bottom of stilling well.

关 键 词：竖井溢洪道 消力井 时均压强 脉动压强 水工模型试验 

分 类 号：TV131[水利工程—水力学及河流动力学]