Effect of CO₂-based binary mixtures on the performance of radial-inflow turbines for the supercritical CO₂ cycles

Effect of CO₂-based binary mixtures on the performance of radial-inflow turbines for the supercritical CO₂ cycles

Yang, Yueming (Shandong University)
Wang, Xurong (Henan University of Urban Construction)
Hooman, K. (TU Delft Process and Energy)
Han, Kuihua (Shandong University)
Xu, Jinliang (North China Electric Power University)
He, Suoying (Shandong University)
Qi, Jianhui (Shandong University; North China Electric Power University)

Process and Energy

2023

Recently, the supercritical carbon dioxide (SCO₂) power cycle has become a hotspot in the field of energy-efficient utilization. The utilization of additives in the power cycle has been proven to be an effective way to improve the SCO₂ power cycle efficiency. As one of the core components of the system, the influence of CO₂-based mixtures on turbine performance needs to be further explored. In this study, the preliminary design and three-dimensional numerical simulation of a 500 kW radial-inflow turbine (RIT) for small-scale SCO₂ power systems were carried out. Furthermore, the design and off-design performance of high Reynolds number and small size turbine under the change of the CO₂-based binary mixture compositions and mixing ratios were studied. Increasing the amount of nitrogen, oxygen, or helium into CO₂ has a negative effect on the RIT performance, and the appropriate amount of xenon or krypton can improve the turbine efficiency. Moreover, mixtures with higher krypton additions adapt to higher heat source conditions. The loss of the turbine stage passage shows that a large amount of helium greatly reduces the working fluid density, and the high amount of xenon has a great influence on the dynamic viscosity, which all makes the RIT operation deviate from the steady state. Therefore, the CFD model simulation fails indicating that RIT designed based on pure CO₂ may not run smoothly and continuously. The losses in the stage with pure CO₂ and CO₂–Kr mixture were investigated. The results indicate that the losses originated from the stator cannot be ignored and that the improvement of efficiency is mainly owed to the reduction in clearance losses. There is no doubt that the viewpoints proposed in this paper have significant reference value for the practical application of the SCO₂ power cycle using mixtures.

CO-based binary mixture
Numerical simulation
Radial-inflow turbine
Supercritical carbon dioxide
Turbine stage losses

http://resolver.tudelft.nl/uuid:008210d5-61ec-4b11-8799-855609248ddc

https://doi.org/10.1016/j.energy.2022.126429

2023-06-19

0360-5442

Energy, 266

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2023 Yueming Yang, Xurong Wang, K. Hooman, Kuihua Han, Jinliang Xu, Suoying He, Jianhui Qi