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尾水管是中、低水头轴流式水轮机中非常重要的部件,它对转轮出口动能的回收以及水轮机的整机效率有重要影响。而肘管段作为尾水管中的核心部件,其形状对尾水管的性能有决定性影响。该文提出了一种尾水管肘管的多工况优化设计方法。该方法采用Bézier曲线参数化技术将肘管断面中线形状以及肘管断面的高度、宽度分布规律曲线以10个形状参数进行表达,以最优工况和额定工况下的尾水管平均静压回复系数作为目标函数,以NSGA-II算法作为寻优工具开展了尾水管肘管段的多工况优化设计。将该方法应用于某轴流式电站模型机尾水管肘管的优化,结果显示,含有优化后尾水管的水轮机整机效率在最优工况点提高了0.3%,在额定工况点提高了0.21%。
The draft tube is a very important part of the low-head axial-flow turbine. It has an important influence on the recovery of kinetic energy at the outlet of the runner and on the overall efficiency of the turbine. The elbow section as a draft tube in the core components, the shape of the draft tube performance has a decisive influence. This paper presents a multi-working condition optimization design method of draft tube elbow. The method uses Bézier curve parameterization technique to express the shape of the middle section of the elbow section and the height and width distribution curve of the elbow section with 10 shape parameters. Under the optimal condition and the average static pressure of the draft tube under the rated condition, Coefficient as an objective function, NSGA-II algorithm as a tool to optimize the multi-working conditions of the draft tube elbow section. The method is applied to the optimization of draft tube elbow of an axial-flow power station model machine. The results show that the efficiency of the turbine with the optimized draft tube is increased by 0.3% at the optimum working condition and increased at the rated working condition 0.21%.