摘要
银盘船闸水头高使得输水阀门及分流口区极易出现水流空化。虽然阀门段和分流口区空化问题在三峡多级船闸中进行过大量的研究,但是因单级船闸泄水时下游水位相对恒定,阀门工作条件极为恶劣;又因银盘船闸下游通航水位变幅大,不能采用阀门浅埋深加自然通气的方法解决空化问题;另受地质等因素限制,阀门埋深又不能太大,使解决阀门段空化问题难度进一步加大。为保证船闸建成后自身及通行船舶的安全,进行了1∶20模型试验,试验发现设计方案阀门段已出现真空负压,分流口压力脉动大。通过对输水阀门运行方式及输水系统布置等进行优化,使阀门段最低时均压力上升至2×9.8 kPa,基本解决了阀门段空化等关键技术问题,为设计提供了科学依据。
The maximum water head of Yinpan Lock is 36.46 m. Because of its high water head, the tainter valve and the diversion opening zone are easy to be cavitated. Although the cavitation problem of the tainter valve and the diversion opening zone have been studied in the Three Gorges Project Lock which has five steps, the working condition of tainter valve of this single lift lock is worse while emptying because of its relatively constant water level of downstream; besides, the Yinpan Lock has big navigation stage fluctuation in the downstream, so the cavitation problem can not be solved by embedding shallowly the tainter valve and natural ventilation, and in consideration of the geological factor, the embedded depth of the tainter valve can't be too big, so it is more difficult to solve the cavitations problem of the tainter valve zone. To ensure the safety of the lock itself and ships, the model scale 1 : 20 test was conducted. According to the model test results, we found there existed vacuum pressure in the tainter valve zone and big pressure pulsation in the diversion openings of the design scheme. By optimizing the working mode of the tainter valve and the arrangement of water delivery system, the minimum time-average pressure is to be rised to 2 × 9.8 kPa, some key problems of cavitation of the tainter valve zone have been solved, and it has offered scientific basis to the design.
出处
《长江科学院院报》
CSCD
北大核心
2008年第6期6-9,共4页
Journal of Changjiang River Scientific Research Institute
关键词
船闸
输水廊道
阀门段
分流口
泄水口
lock
water delivery gallery
valve section
diversion openings
discharging outlet