Performance and Loss Analysis of a Small-Scale Supercritical CO2 Turbine

The supercritical carbon dioxide (S-CO2) power cycle is widely applicable to the utilization of multigrade heat sources due to its high efficiency and compact structure, in which the turbine is critical to the performance of the system. In this study, the operation pattern and output performance of...

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Bibliographic Details
Published in:International journal of energy research 2023-06, Vol.2023, p.1-15
Main Authors: Tian, Hua, Lin, Xin, Li, Ligeng, Zeng, Xianyu, Wang, Yurong, Shi, Lingfeng, Wang, Xuan, Liang, Xingyu, Shu, Gequn
Format: Article
Language:English
Subjects:
Carbon cycle
Carbon dioxide
Cooling
Design
Distribution
Efficiency
Electric power
Flow separation
Heat exchangers
Heat sources
Investigations
Mathematical models
Nuclear power plants
Optimization
Pressure ratio
Reynolds number
Simulation
Temperature
Tip clearance
Turbine engines
Turbines
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Summary:The supercritical carbon dioxide (S-CO2) power cycle is widely applicable to the utilization of multigrade heat sources due to its high efficiency and compact structure, in which the turbine is critical to the performance of the system. In this study, the operation pattern and output performance of an S-CO2 axial turbine with a design power scale of 10 kW power are investigated by experiments and numerical simulations. The loss mechanisms and distributions are analyzed using numerical simulations and loss models. The results show that the turbine output power and efficiency are at 9.66 kW and 36.6% at the designed condition and the output performance depends on the pressure ratio and rational speed. In addition, the flow field distribution reveals that the flow separation phenomenon occurs leading to loss, with the tip clearance loss being the most significant. Furthermore, the loss model validated in this paper is proven to be competent enough to fulfill the prediction of the loss distribution under different operational conditions, which could be very promising in the design of an S-CO2 axial turbine.
ISSN:0363-907X
1099-114X
DOI:10.1155/2023/4835473