One-Dimensional Analysis of Full Load Draft Tube Surge
One-Dimensional Analysis of Full Load Draft Tube Surge
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DOI：
10.1115/fedsm2007-37304
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
C. Chen;C. Nicolet;K. Yonezawa;M. Farhat;F. Avellan;Y. Tsujimoto
中科院分区：
文献类型：
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作者：
C. Chen;C. Nicolet;K. Yonezawa;M. Farhat;F. Avellan;Y. Tsujimoto
对由压力钢管、转轮和尾水管组成的水力系统进行了一维稳定性分析，以确定满负荷尾水管喘振的原因。假定转轮出口处的空穴体积是涡核处压力的函数，该压力由转轮出口处的瞬时局部压力以及由于旋流上的离心力导致的额外压力降来评估。研究发现，尾水管的扩散器效应在所有流量下都具有不稳定作用，而旋流效应在大于/小于无旋流流量时使系统稳定/不稳定。对扩散器和旋流效应的不稳定机制进行了解释。还讨论了压力钢管中声速有限性的影响。
One-dimensional stability analysis of a hydraulic system composed of a penstock, a runner and a draft tube was carried out to determine the cause of the full load draft tube surge. It is assumed that the cavity volume at the runner exit is a function of the pressure at the vortex core evaluated from the instantaneous local pressure at the runner exit and an additional pressure decrease due to the centrifugal force on the swirling flow. It was found that the diffuser effect of the draft tube has a destabilizing effect over all flow rates while the swirl effects stabilize/destabilize the system at larger/smaller flow rates than the swirl free flow rate. Explanations of the destabilizing mechanism are given for the diffuser and swirl flow effects. The effect of finiteness of sound velocity in the penstock is also discussed