抽水蓄能机组S特性区流动特性与能量损失机理研究OA
Study on flow behaviors and energy loss mechanisms in S-characteristic zone of pumped storage units
为了研究抽水蓄能机组在S特性区的流动特性与能量损失机理,本文以额定水头451米的抽水蓄能机组模型机为研究对象,选取水轮机工况、飞逸工况和制动工况,开展全流域非定常流动数值模拟,结合改进近壁面损失函数的熵产理论和内流场分析,揭示了S特性区水泵水轮机能量损失分布规律与主导机制.结果表明:近壁面熵产损失占总熵产损失的 21.7%～26.8%,这说明近壁面区的熵产对总熵产有一定贡献,但主流区熵产为总熵产的主要组成部分;转轮区域熵产占比较高,在三个典型工况内占比为45%～51%,是 S特性区的能量耗散和水力激励的核心区域;转轮进口回流、叶片通道涡与尾水管涡是导致流动失稳和能量损失加剧的关键流动结构.本文为抽水蓄能机组在"S"特性区的稳定运行与水力优化提供了理论依据.
To investigate the flow behaviors and energy loss mechanisms of a pumped storage unit operating in the S-characteristic zone,this study focuses on a model pump-turbine with a rated head of 451 m.Unsteady flows across the full flow passage are simulated numerically for the operating conditions in turbine,runaway,and braking modes;Distribution patterns and dominant mechanisms of energy losses are revealed by integrating an analysis of internal flow and the entropy production calculated using an improved near-wall loss function.The results indicate that near-wall entropy production accounts for 21.7%to 26.8%of the total,obviously a significant contribution;the major production,however,comes from the mainstream.The runner section contributes most of the total production,or in the 45%-51%range in the three typical modes,establishing it as the core region for energy dissipation and hydraulic excitation in S-zone operation.Key flow structures responsible for flow instability and increased energy loss include runner inlet backflows,blade channel vortices,and draft tube vortices.This study lays a basis for future studies of stable S-zone operation and hydraulic optimization of pumped storage units.
李春杰;周金鹏;符云衡;陈勇;付晓龙
哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001
能源科技
抽水蓄能机组"S"特性区流动特性能量损失数值模拟
pumped storage unitS-characteristic zoneflow characteristicsenergy lossnumerical simulation
《水力发电学报》 2026 (6)
12-22,11
国家自然科学基金面上项目(52579084)
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