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Investigation into Off-Design Performance of a S-CO 2 Turbine Based on Concentrated Solar Power

Author

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  • Di Zhang

    (MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yuqi Wang

    (MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yonghui Xie

    (MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

Research on concentrated solar power (CSP) plants has been increasing in recent years. Supercritical carbon dioxide (S-CO 2 ) has been applied to solar power plants due to its promising physical properties. S-CO 2 has a relatively low critical temperature of 31.1 °C and owns high density in the supercritical region. Hence, it is a vital working fluid in the application of low temperature heat source and miniature power equipment. Due to the fact that solar power system has a constantly changing heat source according to season and weather, a satisfactory off-design performance is necessary for the turbine in a solar power system. In this work, a S-CO 2 radial-inflow turbine based on CSP is designed. A thorough numerical analysis of the turbine is then performed. To investigate the off-design performance of this turbine, three types of nozzle profiles with different leading edge diameters are adopted. Mach number, temperature and pressure distribution are covered to present the off-design effect with different nozzle profiles. Moreover, the relation of output power, mass flow rate and efficiency with different leading edge diameter (LED) are analyzed. Results show that different LED has a vital influence on the aerodynamic characteristics and off-design performance of the S-CO 2 turbine based on CSP. In addition, the designed turbine with LED = 4 mm can obtain the highest mass flow rate and output power. While the turbine with LED = 10 mm provides slightly better off-design efficiency for CSP plants.

Suggested Citation

  • Di Zhang & Yuqi Wang & Yonghui Xie, 2018. "Investigation into Off-Design Performance of a S-CO 2 Turbine Based on Concentrated Solar Power," Energies, MDPI, vol. 11(11), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3014-:d:180004
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    References listed on IDEAS

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    Cited by:

    1. Wang, Yuqi & Liu, Tianyuan & Meng, Yue & Zhang, Di & Xie, Yonghui, 2022. "Integrated optimization for design and operation of turbomachinery in a solar-based Brayton cycle based on deep learning techniques," Energy, Elsevier, vol. 252(C).
    2. Aofang Yu & Wen Su & Li Zhao & Xinxing Lin & Naijun Zhou, 2020. "New Knowledge on the Performance of Supercritical Brayton Cycle with CO 2 -Based Mixtures," Energies, MDPI, vol. 13(7), pages 1-23, April.
    3. Wang, Yuqi & Du, Qiuwan & Li, Yunzhu & Zhang, Di & Xie, Yonghui, 2022. "Field reconstruction and off-design performance prediction of turbomachinery in energy systems based on deep learning techniques," Energy, Elsevier, vol. 238(PB).

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