【作者】 柳海涛； 孙双科； 陈能平； 龙起煌；

【Author】 Liu Haitao~1 Sun Shuangke~1 Chen Nengping~2 Long Qihuang~2 (1,China Institute of Water Resources and Hydropower Research,Beijing,100038; 2,Guiyang Hydropower Investigation Design & Research Institute,CHECC,Guiyang Guizhou 550002)

【机构】 中国水利水电科学研究院水力学研究所； 中国水电顾问集团贵阳勘测设计研究院；

【摘要】 本文以光照水电站分层取水口为例,通过水工模型试验,对采用叠梁门型式的分层取水口进行了水力学特性研究。试验结果表明,上游水位与门项水头对进水室内流态与水头损失有显著的影响。通过对进水室内叠梁门中墩尾部采取收缩体型,可将最小门顶水头降低到15 m 左右。此时,进水室内保持良好的水流流态,且无有害漩涡出现。进水口的水头损失系数在0.49～0.67 之间,其变化与叠梁门的总高度和门顶水头呈反比关系。另外,叠梁门顶部的流速垂线分布均呈上小下大的形态,底部流速约为平均流速的1.3～1.5倍,这些在设计中应予以考虑。更多还原

【Abstract】 The hydraulic characteristics of a stratified intake with stop logs gates was studied in the model test of Guang-zhao project.The results showed that,the water level and head above the stop logs have great influence both on the flow field in the shaft inlet and the total entrance loss.The lowest head allowed above stop log can be down to 15m by design the middle piers with contractive trapezoid tail in the shaft inlet.As the result,the stable flow pattern has been maintained and no bad vortex formed in the intake.The entrance loss coefficient is within 0.49～0.67,which varies inversely with the head above stop log and its total height.In addition,the bottom velocity above the stop log is about 1.3～1.5 times of the mean velocity,which should be considered in the design of the stop log operating facilities.更多还原