潜没式三角翼体对闸后突扩水跃的影响
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摘要
针对泄水闸少数孔开启时,下游渠道形成主流受压缩的三元突扩水跃问题,建立1∶100的水工试验模型,并采用潜没式三角翼体作为辅助消能工控导水流,分析多种工况条件下跃前断面的水流流态。试验结果表明,潜没式三角翼体通过减小主流的单宽流量,重新调整了跃前断面动量与水位的分布,提高了跃前断面水流的整体稳定性,并缩短了泄水口至跃首断面间急流段的长度,改善了下游水流的衔接消能,效果良好。研究成果可为实际工程应用提供技术支持。
When the multiple-outlet sluice is opened partly,the mainstream compression of 3Dabrupt expansion hydraulic jump is formed behind the sluice.Different situations were simulated with a 1∶100sluice model test.And a submerged triangle wing was introduced to analyze the regime of the cross-section before a hydraulic jump as auxiliary energy dissipation.The results show that the submerged triangle wing could adjust redistribution of momentum and depth on the cross-section before hydraulic jump,and strengthen the stability of the section by decreasing unit-width discharge of the mainstream,which made the energy dissipation of hydraulic jump more adequate.It also reduced the distance from the drain to cross-section before hydraulic jump.The results could provide technical support for engineering application.
When the multiple-outlet sluice is opened partly,the mainstream compression of 3Dabrupt expansion hydraulic jump is formed behind the sluice.Different situations were simulated with a 1∶100sluice model test.And a submerged triangle wing was introduced to analyze the regime of the cross-section before a hydraulic jump as auxiliary energy dissipation.The results show that the submerged triangle wing could adjust redistribution of momentum and depth on the cross-section before hydraulic jump,and strengthen the stability of the section by decreasing unit-width discharge of the mainstream,which made the energy dissipation of hydraulic jump more adequate.It also reduced the distance from the drain to cross-section before hydraulic jump.The results could provide technical support for engineering application.
引文
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[4]杨凡,王均星,陈帅,等.低弗劳德数水流辅助消能工空蚀问题研究[J].水力发电学报,2015,34(2):125-129,135.
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