Irreversible losses, characteristic sizes and efficiencies of sCO2 axial turbines dependent on power capacities

Tianze Wang, Jinliang Xu, Zhaofu Wang, Haonan Zheng, Jianhui Qi and Guanglin Liu

Energy, 2023, vol. 275, issue C

Abstract: Supercritical carbon dioxide (sCO2) cycle can be driven by fossil energy and solar/nuclear energy. Available references maximize cycle efficiency by fixing turbine efficiencies ηtt in advance. Here, we provide turbine efficiencies dependent on power capacities WT which are in the range of (50–450) MW. After examination of working mechanism and special characteristic of sCO2 turbines, a comprehensive model was presented to predict characteristic sizes, irreversible losses and efficiencies of turbines. Characteristic size of turbines (lc) is found to obey the scale law of lc∼WT0.5. Profile loss Yp, secondary loss Ys, clearance loss Ycl and trailing edge loss Yte obey the scaling laws of Yp∼WT−0.075,Ys∼WT−0.075,Ycl∼WT−0.39,Yte∼WT−1. These scaling laws agree with the correlations based on numerical simulations. With continuous increase of WT, ηtt increases but the slope of the curves become gentle. Efficiency maps are provided based on inlet pressures Pin and temperatures Tin. By fixing WT, ηtt decreases with increase of Pin and Tin. The scaling laws regarding irreversible losses provide the guidance to optimize the turbine design. The efficiency maps can be integrated in the cycle analysis for accurate estimate of system performance, and help to select suitable power capacity.

Keywords: sCO2 cycle; Turbine efficiency; Irreversible loss; Scaling law (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:275:y:2023:i:c:s0360544223008319

DOI: 10.1016/j.energy.2023.127437

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