基于数值模拟的闸站结合布置优化设计

平原闸站枢纽工程采用水闸泵站结合布置方式,具有布置紧凑、占地少等优点,但同时亦存在局部回流和强横流等不利流态.选取新沟河延伸拓浚工程遥观北枢纽闸站结合布置方案为例,采用二维水流数模计算方法,对闸站结合布置进行优化设计,论证闸站工程总体布置的合理性以及船舶通航的安全性,并提出优化方案.研究结果表明：为了减轻偏流等不利流态及满足通航要求,闸、站上下游以导流墙（导航墙）相隔是合适的,导流墙的设置可使回流区上移,且导流墙长度的增加可降低横流区横向流速;闸站结合布置形式中,泵站进水侧布置清污机桥,一方面可清除污物,提高泵站效率和机组运行的稳定性,另一方面,清污机墩可改善站前水流流态.研究成果可为类似工程设计提供参考依据.

Layout design optimization of integrated pumping station and sluice with numerical stream simulation

In water conservancy hub projects located at plains, usually the pumping station and sluice are integrated together for a compact layout to save land and reduce costing. However, this combined layout can result in unwanted flow patterns, such as locally reverse flow, strong lateral current and so on. Thus, as a case study, the asymmetrical layout of integrated pumping station and sluice in North Yaoguang Water Conservancy Hub Project is optimized and finalized based on two-dimensional numeri- cal stream simulations and a detailed discussion about the layout rationality and safety of navigation. It is shown that it is proper to install a diversion pier between the pumping station and the sluice upstream and downstream in order to alleviate uneven flow patterns and satisfy the safety of navigation. Additionally, the diversion pier can drive the reverse flow zones to further upstream and an increased length of the piers can reduce the velocity of lateral current. A trash rack bridge is installed in the intake of the pumping station to collect debris and improve flow patterns, causing an increased pump efficiency and operational stability. The results have significance for layout design in similar conservancy projects.