Vortex Patterns Investigation and Enstrophy Analysis in a Small Scale S-CO2 Axial Turbine

Ying, Qiyu; Zhuge, Weilin; Zhang, Yangjun; Ma, Chongfang; Gou, Junli; Wang, Wei

doi:10.3390/en14196112

Cited by 4 publications

(4 citation statements)

References 44 publications

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“…The flow characteristics of logarithmic layer and viscous sublayer in high pressure guide vane cascades were studied using dimensionless vorticity analysis method [74]. Ying et al designed and investigated a 100 kW level S-CO2 axial turbine by using 3D transient viscous flow simulation method [75]. The vortex flow is influenced by the geometric parameters of the S-CO2 turbine rotor, such as the aspect ratio and tip-to-hub ratio.…”

Section: Flow Characteristics Of S-co2 Turbinesmentioning

confidence: 99%

A review of research on turbines for supercritical carbon dioxide power systems

Hu,

Jiang,

Zhuge

et al. 2024

J. Phys.: Conf. Ser.

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Supercritical carbon dioxide (S-CO2) Brayton cycle has been known as a potential power cycle technology because of its high efficiency, compact structure and suitability for different heat sources. As one of the key components in the cycle, the turbine has an important impact on the cycle efficiency. Compared with traditional steam and gas turbines, S-CO2 turbines have high working pressure and small size. The internal flow characteristics are significantly different. In this paper, the research progress of S-CO2 turbines in recent years is reviewed. The design and performance evaluation methods for S-CO2 turbines of different types and power levels are summarized, and research on loss correlations and optimization algorithms are introduced. The features of flow field in S-CO2 turbines are discussed. Current studies mainly evaluate the flow field and flow losses through Computational Fluid Dynamics (CFD), and some studies further analyze the influencing mechanism of turbine geometric parameters on flow characteristics. The applications of multi-physical field analysis on S-CO2 turbines are also reviewed. The construction and operation of S-CO2 test loops, and relevant turbine experimental study findings are introduced. Future research directions of S-CO2 turbines are proposed.

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Section: Flow Characteristics Of S-co2 Turbinesmentioning

confidence: 99%

A review of research on turbines for supercritical carbon dioxide power systems

Hu,

Jiang,

Zhuge

et al. 2024

J. Phys.: Conf. Ser.

Self Cite

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“…For similar conditions at the stage inlet the CO 2 density is twice higher than air density, at the average. As a result, height of the first boundary layer in grid near the blade wall of turbine operating on supercritical carbon dioxide is twice less than for conventional gas turbines with the same y + [16]. To achieve a low y + value, a grid model with a large number of elements is required.…”

Section: Geometrymentioning

confidence: 99%

“…Presently, there are few publicly available studies on carbon dioxide flow in the blade cooling baffles. Main CO 2 studies cover the application of various heat exchange intensifiers [15] or analysis of gas dynamic properties of the working fluid in inter-blade baffles of the carbon dioxide turbine [16]. There are many papers on the study of various topologies of convective blade cooling systems, but air [17,18]or steam is considered as a refrigerant [19,20].…”

Section: Introductionmentioning

confidence: 99%

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

Komarov¹

2022

Eurasian phys. tech. j.

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Currently, there is an increase in average annual temperature and climate change across the various continents. Carbon dioxide emissions from energy facilities contributed to this condition. Implementation of oxy-fuel cycles is a promising solution for reducing carbon dioxide emissions from the energy sector. To date, the most efficient oxy-fuel cycle is the Allam cycle. In this cycle supercritical carbon dioxide acts as a working fluid of the cycle, wherein СО2’s temperature upstream of the turbine is 1,150 °С and the pressure is 30 MPa. Due to the high temperature of the working fluid, it is necessary to cool first stages of the carbon dioxide turbine. The feature of considered cooling system in this turbine is that carbon dioxide being used as a refrigerant too. This paper investigated two topologies of convective cooling systems in the carbon dioxide turbine’s nozzle blade as well as considers an option for increasing the intensity of heatexchange through the use of helical ribbing in the cylindrical cooling baffle. Numerical simulation involving the ANSYS software package was performed for two topologies of the cooling baffles arrangement in the nozzle blade body: configuration 1 -with 17 baffles of 1 mm diameter, configuration 2 -with three baffles of the blade profile shape. Configuration 1 proved to be more efficient: the Nusselt number has a value of 117, and average value of the heat transfer coefficient on the refrigerant side is 6,413 W/m2∙K. The effect of using helical ribbing in the cooling cylindrical baffle of the blade under study was investigated, which enabled to reduce the metal temperature by 54 °С on average and doubled the heat transfer coefficient.

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“…According to the energy conservation equation, the specific enthalpy change of the working fluid in the surge tank is shown as below [36]:…”

Section: Turbine Modelmentioning

confidence: 99%

Research on Dynamic Modeling of the Supercritical Carbon Dioxide Power Cycle

et al. 2021

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The supercritical carbon dioxide (SCO2) Brayton cycle, as a substitute for the steam cycle, can be widely used in a variety of power generation scenarios. However, most of the existing SCO2 cycle studies are restricted to basic thermodynamics research, parameter optimizations, system design in different application fields, and even economic analysis. Considering the load variability and control flexibility of the power generation system, the dynamic performance research of the SCO2 cycle is also crucial, but the work done is still limited. Based on the previous studies, Simulink software is used in this paper to develop a dynamic model of the 20 MW-SCO2 recompression cycle, which specifically includes component models that can independently realize physical functions and an overall closed-loop cycle model. A series of comparative calculation are carried out to verify the models and the results are very positive. The SCO2 recompression power system is built with the developed models and the dynamic model runs stably with a maximum error of 0.56%. Finally, the simulation of the dynamic switching conditions of the 20 MW-SCO2 recompression cycle are performed and the analysis results supply instructive suggestions for the system operation and control.

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Vortex Patterns Investigation and Enstrophy Analysis in a Small Scale S-CO2 Axial Turbine

Cited by 4 publications

References 44 publications

A review of research on turbines for supercritical carbon dioxide power systems

A review of research on turbines for supercritical carbon dioxide power systems

Development and Research of the Topology of Cooling Baffles for Blades of the Axial Carbon Dioxide Turbines

Research on Dynamic Modeling of the Supercritical Carbon Dioxide Power Cycle

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