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In response to the evident phenomena of flow separation and backflow, low efficiency, and increased cavitation in the tailrace conduit of the Deneng Xiangjiang Hydropower Station after expansion, computational fluid dynamics (CFD) analysis was employed. Two methods, namely, modifying the shape of the tailrace conduit or replacing the runner, were proposed to improve the flow pattern within the tailrace conduit. Research has demonstrated the effectiveness of both methods, which can provide reference for similar projects.

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针对德能湘江水电站扩容后尾水管内水流出现明显脱流与回流、效率低、空蚀加剧的状况，采用计算流体动力学CFD进行分析，提出对尾水管修形或更换转轮的方法，以改善尾水管内水流流态。研究表明此两种方法均有效，可为类似工程提供参考。

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唐仁琥（1968-），男，工程师，研究方向为水利工程设备，E-mail：hndnxj1112@163.com

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唐仁琥（1968-），男，工程师，研究方向为水利工程设备，E-mail：hndnxj1112@163.com

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