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船闸平面阀门底缘空化及改善措施研究(左卫广)

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船闸平面阀门底缘空化及改善措施研究

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#S7H I3FjAk0【作者】左卫广 【导师】胡亚安
z7X;X}*f ]0【作者基本信息】南京水利科学研究院,水力学及河流动力学,2005年,硕士

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h&?$ZY:z3W;}!YNkBD0【中文摘要】 平面阀门不仅存在底缘空化,而且还存在门槽空化,因此在高水头船闸应用中受到较大限制。为了扩大其适用范围,对阀门底缘空化特性及改善措施进行综合研究是很有十分重要的。 通过非恒定流常压水力学模型试验和恒定流减压模型试验,系统研究了三种常见的底缘型式和三种典型的阀门后廊道体型水力特性和空化特性,通过综合分析,得到了较优的底缘型式和廊道体型,并给出了相应的临界空化数。针对底部突扩廊道体型较易发生的跌坎和升坎空化问题,首次提出了跌坎和升坎自然通气措施,模型试验论证了其减免空化的良好效果,并给出了临界通气条件。论文还对门楣自然通气措施中的缝隙比和掺气坎长度进行了系统研究,总结了门楣通气特性及通气量的变化规律。水利论文)it_Yn3y5X-Az

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【英文摘要】 There are hemline cavitation and little-door groove cavitation in the plane gates, so plane gates are used in the navigation locks of high water level less. To widen the range of the plane gates,it is very much important for plane gates to study hemline cavitation and solving measure.Through varying valve hydraulics examination and unvarying decompression examination,we study hydraulics character and cavitation character of three hemlines and veranda bodily forms,so we can not only find more excellent hemline and veranda in them,but also obtain critical number of hemlines cavitation of them.Because there are dropping ridge cavitation and rising ridge cavitation of the enlarging veranda in the bottom,paper gives naturl aerating measure of dropping ridge and rising ridge.It is very well to avoid dropping ridge cavitation and rising ridge cavitation in the examination,and gain critical aerating condition.Thesis also studies gaps and aerifing banks of aerating measure in the lintel,sum up ...更多rules of aerating character and aerating capacity in the lintel.  还原水利论文aAG DW/z9N9T

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【中文关键词】 船闸; 底缘; 空化数; 廊道; 突扩; 台阶; 通气
/S Y4cC K vk0【英文关键词】 navigation lock; hemline ; number of hemline cavitation; veranda; abrupt enlarging verandas ; ladder veranda ; aerate
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TAG: 船闸 阀门 左卫广 平面 空化
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