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大流量贯流式水轮机转轮叶片由轮毂至轮缘形状变化很大,流动特征变化亦非常明显,采用代表半径处能量平均的一元设计将不能满足要求。为了使转轮叶片设计达到更细致的优化设计目标,非常有必要进行二元的转轮叶片翼型优化设计。本文提出将一元能量概念及技术扩张至二元能量收支的新概念。研究中由CFD三维数值解析结果求得叶片进出口二元能量收支状况并对其进行评价及控制,为转轮叶片翼型优化设计提供依据。研究结果表明,二元能量收支方法对优化设计具有实际意义,用此方法设计的贯流式水轮机效率比一元设计提高了0.5%。
Large flow tubular turbine wheel blades vary greatly from the hub to the rim shape, flow characteristics change is also very obvious, using a representative of the radius of the energy at the average design will not be able to meet the requirements. In order to achieve a more detailed and optimized design of the rotor blade design, it is very necessary to carry out the dual-rotor blade airfoil optimization design. This paper proposes a new concept of expanding the concept and technology of unary energy to binary energy balance. In the study, the binary energy balance of the import and export of blades was calculated and analyzed by three-dimensional numerical analysis of CFD, which was evaluated and controlled, which provided the basis for the optimal design of rotor blade airfoils. The results show that the binary energy budget method is of practical significance to the optimal design. The efficiency of the cross-flow turbine designed by this method is 0.5% higher than that of the one-element design.