天池抽水蓄能电站上、下水库整体动床泥沙模型的设计与验证

Design and Verification of Integral Movable-bed Sediment Model for Up-down Reservoirs of Tianchi Pumped Storage Power Station

抽水蓄能电站上、下水库联合运用时,库区及电站进、出水口附近的水流与泥沙淤积规律十分复杂,通常要进行泥沙模型试验研究。针对天池抽水蓄能电站,进行了上、下水库整体动床模型设计,分析确定了满足水流泥沙运动相似与河床变形相似的控制比尺;根据相应比尺确定了模型沙的种类和粒径,并进行了预备试验。利用专门设计的双向管、泵系统,实现了可以进行抽水蓄能和发电两种运行工况的上、下水库连接段的模拟;设计采用VDMS流场实时监测系统对库区与进出、水口的流速及流态进行精细观测。验证试验表明,整体模型的设计、制作满足模拟库区的水流泥沙运动相似与河床变形相似的要求,设计方法可为类似的整体泥沙模型设计提供参考和借鉴。

It is very necessary to do an experiment for sediment model on the flow and sediment deposition near the inlet and outlet of power station and the reservoir when the up and down reservoir of the pumped storage power station is jointly used. Taking Tianchi pumped storage power station as an example, we explored the design and verification of integral sediment model for up-down reservoir. The integral movable-bed model of up-down reservoir has been designed, the control scale which satisfied the similarity laws of flow and sediment motion and the similarity laws of riverbed deformation, was investigated, the types and particle diameters of model sediment were confirmed to correspond to the similar scale, and the preliminary experiment was carried on. The two operation conditions of pumped storage and generation power were realized to simulate the linkage section of up-down reservoir by using a specially designed positive and negative direction pipe-pump system. Adopting VDMS flow-field and real-time monitoring system in the design, the veloci- ty and flow pattern near inlet and outlet and reservoir were finely observed. Experiments have verified that the design and manufacture of integral model satisfy the similarity of flow and sediment motion and the similarity of riverbed deformation in the reservoir, and the design method gives a reference to the design for similar integral sediment model.