Supercritical CO${}_2$ thermal cycles provide low complexity and small size of equipment compared to the Rankine cycle. However, higher power units of hundreds of megawatts have not yet been implemented. This study focuses on sCO${}_2$turbines for high power cycles and presents an estimation of their dimensions, efficiency, and other parameters. For this purpose, a specialized calculation code named TACOS was built. The turbines are designed for inlet pressures of 25 MPa and 30 MPa and inlet temperatures from 300 $°$C to 600 $°$C. In total, more than 460 high-performance axial turbines were designed in this study. The turbines have been optimized with shaft power from 10 MW to 2,000 MW (one-flow configuration) for revolutions from 3,000 rpm to 12,000 rpm. The results show that supercritical CO${}_2$ turbines are about one-fifth the size of their steam alternatives with comparable efficiencies. Turbines with synchronous revolutions (50 Hz) achieve the highest efficiency for shaft power in one-flow configuration up to 500 MW and this correspond to an efficiency close to 90%. High-speed turbines are suitable for power levels up to 50 MW with efficiencies of around 87%. The vast majority of turbines come out as three-stage or four-stage.

超临界二氧化碳${}_{\mathrm{2个}}$与朗肯循环相比，热循环提供低复杂性和小尺寸的设备。然而，尚未实施数百兆瓦的更高功率单元。本研究主要针对 sCO${}_{\mathrm{2个}}$用于高功率循环的涡轮机，并提供了对其尺寸、效率和其他参数的估计。为此，构建了名为 TACOS 的专用计算代码。涡轮机的设计入口压力为 25  MPa 和 30  MPa，入口温度为 300 $°$摄氏度至 600 $°$C. 本研究总共设计了 460 多个高性能轴流式涡轮机。涡轮机经过优化，轴功率从 10  MW 到 2,000  MW（单流配置），转速从 3,000  rpm 到 12,000  rpm。结果表明，超临界 CO${}_{\mathrm{2个}}$涡轮机的尺寸约为其蒸汽替代品的五分之一，但效率相当。同步转速 (50  Hz) 的涡轮机在高达 500  MW 的单流配置中实现轴功率的最高效率，这相当于接近 90% 的效率。高速涡轮机适用于高达 50  MW 的功率水平，效率约为 87%。绝大多数涡轮机都是三级或四级的。