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通航船闸输水阀门后复杂分离流试验研究(韩智明)

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"?0y2iV~9]nnb0【作者】韩智明 【导师】李云水利论文 EeE NZ%n:g3w)hR
【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,硕士水利论文KzMIsO1Z#af

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【中文摘要】 高水头船闸输水反弧阀门段空化与振动问题,是船闸工程成败的关键技术问题。输水反弧阀门在开启过程中,由负压、高速水流以及压力与流速的剧烈时空脉动导致空蚀破坏,产生阀门振动和声震现象。而这些有害现象都与输水阀门后的流态变化有着密切的关系。因此,分析研究阀门段水流急变分离流的流态及其变化规律,对理论研究和工程设计实践都具有重要意义。 本文建立了船闸反弧门段的局部物理模型以及明渠跌坎的物理模型,采用PIV测速系统,首先对明渠跌坎的水流流场和水流结构进行了试验研究,在此基础上,对不同的开度下门后水流流态、水流结构和流场进行了较为详细的研究。研究了阀门后时均情况下的回流区长度、收缩系数、涡量场以及主流的变化情况和回流区、收缩系数的变化特性。研究成果表明:首次采用高分辨率双CCD同步测量方法,获得了反弧门后精细的水流流场;反弧门后水流回流区长度在0.2开度达到最大值,然后随开度的增大回流区长度逐渐减少;直接测出了反弧门不同开度的收缩系数值;通过涡量场的分析,可以直观反映出在小开度情况下,再附着点具有较强的脉动现象;回流区变化幅度与收缩系数变化幅度随开度的增大不断缩小;明渠跌坎水流回流区长度Lr随雷诺...更多数Re的增大而增大。 论文对研究输水阀门空化机理,防止空蚀、阀门振动和声震,为通气、检修阀门的设置等提出理论支持。同时在国内外利用PIV直接测量通航船闸输水阀门后流场和水流结构等方面尚未见到相关资料,可为今后进行船闸反弧门后水流数值计算和理论研究提供参考。  还原水利论文Bq1g"@Q&_:c|

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【英文摘要】 Cavitation and vibration of the reversed tainter valve culvert of a high-lift shiplock is key technique problem of shiplock engineering success or failure. During the valve-opening, negative pressure and high velocity as well as their intense fluctuations in space and time could result in cavitation, valve vibration and sonic boom in the reversed tainter valve culvert. But these harmful phenomena are closely related to the variety of flow pattern behind the reversed tainter valve. Therefore, the analysis of flow pattern and variety regulations of unsteady separated flow behind the reversed tainter valve is of great importance to theoretical study and engineering design.The partial physical model of the reversed tainter valve culvert and open channel ridge has been established. By using particle image velocimetry(PIV) the flow pattern and flow frame of open channel ridge were measured. Based on this test, more detailed research of the flow pattern and flow frame and flow field in differ...更多ent valve opening were made. The recirculation zone length, contraction coefficient and vorticity as well as the variety of main flow and the intense fluctuation of recirculation zone and contraction coefficient were studied. The results indicated: Adopting the synchronous measure method of high distinguishing two-CCD for the very first time, the details of the flow field which is behind reversed tainter valve were acquired; the biggest value of the recirculation zone length of flow behind reversed tainter valve was attained, then with opening degree increases the recirculation zone length reduces gradually; the contraction coefficient of different valve opening were found out directly; by analysing measured field of vorticity, we knew to have the stronger pulsation phenomenon at adhesion point. With increasing of the valve opening the range of the recirculation zone length and the contraction coefficient was reduced continuously; With increasing of Re the open channel ridge recirculationzone length (Lr) was increased continuously.This paper puts forward the theories support to the research of cavitationmechanism, preventing cavitation, valve vibration and sonic boom, to venting and the setting of vale for examine and repair. At the same time the data, which use PIV to measure the flow field and flow frame directly at the domestic and international research, has not be found out. So the paper can also offer consults to numerical computing and theoretical research to the flow of the reversed tainter vale of navigation shiplock.  还原水利论文mu yxM ]

Ej3Rxw\O4S ^ q8s9r0【中文关键词】 复杂分离流; 水流流态; PIV; 船闸; 反弧门; 回流区长度; 收缩系数水利论文 {6VI2^)w(s&F8AKL
【英文关键词】 complicated separation flow; flow pattern; PIV; Shiplock; reversed tainter valve; recirculation zone length; contraction coefficient

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TAG: 船闸 通航 韩智明 阀门 输水
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