To investigate the aerodynamic loss mechanisms in supercritical carbon dioxide turbine (CT) and steam turbine (ST) stages, entropy generation and entropy generation rate are used to analyze various losses in stage passages. The results reveal that under sealing clearance at 2.5 % blade height, the leakage losses of CT and ST constitute over 7 % of total available energy. Rotor and stator losses of CT and ST decrease as the Mach number of stage outlet increases. The endwall losses of CT and ST rotor are both predominant, constituting over 1.78 % of total available energy, with lower endwall losses of CT rotor. Furthermore, the stator profile loss of CT represents the majority of stator loss and is notably higher than that of ST. The impact loss and separation loss are more pronounced in CT. The conclusions will provide direction, guidance, and data support for the design and optimization of CT and ST.

中文翻译：

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超临界二氧化碳和蒸汽涡轮机级空气动力损失的比较评估

为了研究超临界二氧化碳涡轮机（CT）和蒸汽涡轮机（ST）级的气动损失机制，使用熵产生和熵产生率来分析级通道中的各种损失。结果表明，在2.5%叶片高度的密封间隙下，CT和ST的泄漏损失占总可用能量的7%以上。 CT和ST的转子和定子损耗随着级出口马赫数的增加而减少。 CT 和 ST 转子的端壁损耗均占主导地位，占总可用能量的 1.78% 以上，其中 CT 转子的端壁损耗较低。此外，CT 的定子型线损耗占定子损耗的大部分，并且明显高于 ST。 CT 中的冲击损失和分离损失更为明显。结论将为CT和ST的设计和优化提供方向、指导和数据支持。