单向流水域蘑菇头式排水口热扩散特性三维数值模拟  

Three-dimensional numerical simulation of the thermal diffusion characteristics of a unidirectional water area's mushroom head type outfall

作　　者：李宏鹏 陈文焕 吴修锋[1] 高昂 LI Hongpeng;CHEN Wenhuan;WU Xiufeng;GAO Ang(The National Key Laboratory of Water Disaster Prevention,Nanjing Hydraulic Research Institute,Nanjing 210029,China;China Nuclear Power Engineering Company Limited,Shenzhen 518172,China)

机构地区：[1]南京水利科学研究院水灾害防御全国重点实验室,江苏南京210029 [2]深圳中广核工程设计有限公司,广东深圳518172

出　　处：《水利水运工程学报》2024年第2期72-80,共9页Hydro-Science and Engineering

基　　金：国家自然科学基金专项资金项目(52209096)。

摘　　要：由于蘑菇头排水口近区温排水受排水射流、环境流和密度流多因素协同驱动,输移扩散规律较复杂,理清蘑菇头式排水口近区水力及热力特性对指导工程设计具有重要意义。采用三维数值模拟方法,研究单向流环境水域蘑菇头式排水口(四面开窗)近区三维水力和热力特性,结果表明:随着单向流流速的增大,各窗口排出的温排水向单向流下游方向的偏移程度逐渐增大;逆单向流方向窗口排出的水流受单向流顶冲影响显著,流量随着单向流流速的增大而减小,减小的流量主要通过垂直于单向流方向的两个窗口排出,顺单向流方向窗口的流量对单向流的响应并不敏感;随着单向流流速的增大,顺单向流方向窗口射流逐渐由向水面的“上喷射”流态转变为向海床的“下扫掠”流态;各窗口温排水的温升分布随着流速比增大,先汇合后逐渐呈“元宝”形;单向流流速增加能有效减小1.0℃温升水体积。The thermal diffusion characteristics of mushroom head type outfalls in unidirectional water areas are influenced by various factors,including discharge jet,environmental flow,and density flow.Understanding the hydraulic and thermal behavior of these outfalls is crucial for guiding engineering design.In this study,a threedimensional numerical simulation method was employed to investigate the hydraulic and thermal characteristics near a mushroom head type outfall(four-sided window)in a unidirectional flow environment.The results indicate that as the unidirectional flow velocity increases,the warm drainage from each window deviates further downstream.The reverse flow in the opposite window decreases with higher unidirectional flow velocity,while the flow in the direction window remains less sensitive to the unidirectional flow.Additionally,the direction of the window jet transitions from an upward flow on the surface to a downward flow toward the seabed as the unidirectional flow velocity increases.Moreover,as the velocity ratio increases,the temperature rise distribution in each window initially converges and then gradually assumes a“Yuanbao”shape.Furthermore,an increase in unidirectional flow velocity effectively reduces the volume of water with a temperature rise of 1.0℃.

关 键 词：电站 温排水 蘑菇头式排水口 流场 温度场 

分 类 号：TV131[水利工程—水力学及河流动力学]