Effects of leading edge profiles on flow behavior and performance of supercritical CO2 centrifugal compressor

Pei, Jinze; Zhao, Yuanyang; Zhao, Mingran; Liu, Guangbin; Yang, Qichao; Li, Liansheng

doi:10.1016/j.ijmecsci.2022.107520

Cited by 14 publications

(3 citation statements)

References 54 publications

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“…Through numerical simulation, Pei et al analysed the causes of blade leading-edge condensation and its impact on compressor performance. They suggested a corrective approach to enhance the flow behaviour at the blade's leading edge, resulting in a 1.411% improvement in the compressor isentropic efficiency and a 0.0353 increase in the pressure ratio [68]. Additionally, they examined the effect of varying the compressor inlet temperatures on the performance under different operating conditions and thermal loads [69].…”

Section: Compressormentioning

confidence: 99%

Research Advances in the Application of the Supercritical CO2 Brayton Cycle to Reactor Systems: A Review

Xiao,

Zhou,

Yuan

et al. 2023

Energies

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Amid the global emphasis on efficient power conversion systems under the “dual carbon” policy framework, the supercritical CO2 (SCO2) Brayton cycle is a noteworthy subject, owing to its pronounced efficiency, compact design, economic viability, and remarkable potential to increase the thermal cycle efficiency of nuclear reactors. However, its application across various nuclear reactor loops presents divergent challenges, complicating system design and analytical processes. This paper offers a thorough insight into the latest research on the SCO2 Brayton cycle, particularly emphasising its integration within directly and indirectly cooled nuclear reactors. The evolution of the Brayton cycle in nuclear reactor systems has been meticulously explored, focusing on its structural dynamics, key components, and inherent pros and cons associated with distinct reactor loops. Based on the theoretical frameworks and empirical findings related to turbomachinery and heat exchangers within the cycle, we chart a course for future enquiries into its critical components, underscoring the indispensable role of experimental investigations. This paper conclusively assesses the feasibility of deploying the SCO2 Brayton cycle in direct and indirect cooling contexts, offering a forward-looking perspective on its developmental trajectory. The SCO2 Brayton cycle may become a focal point for research, potentially creating avenues for nuclear energy endeavours.

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Section: Compressormentioning

confidence: 99%

Research Advances in the Application of the Supercritical CO2 Brayton Cycle to Reactor Systems: A Review

Xiao,

Zhou,

Yuan

et al. 2023

Energies

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show abstract

“…The closer the inlet condition is to the critical point, the greater the system performance is [4][5][6]. However, when the compressor inlet condition approaches the critical point, the thermophysical properties of CO 2 will change dramatically, deviate significantly from the ideal gas and show a strong real-gas effect [7,8]. On the other hand, the critical point is the end of the saturation line.…”

Section: Introductionmentioning

confidence: 99%

Effects of Near-Critical Condensation and Cavitation on the Performance of S-CO2 Compressor

Xie,

Tian,

Jiang

et al. 2024

Energies

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The supercritical carbon dioxide (S-CO2) Brayton cycle efficiency increases as the compressor inlet condition approaches the critical point. However, the thermodynamic properties of CO2 vary dramatically near the critical point, and phase change is most likely to happen. Both cavitation and condensation bring about significant adverse effects on the performance of compressors. In this paper, the quantitative effects of nonequilibrium condensation and cavitation on the performance of an S-CO2 centrifugal compressor with different inlet-relative entropy values are investigated. The properties of CO2 were provided by the real-gas property table, and the nonequilibrium phase-change model was adopted. The numerical simulation method with the nonequilibrium phase-change model was validated in the Lettieri nozzle and Sandia compressor. Furthermore, simulations were carried out in a two-stage centrifugal compressor under conditions of various inlet-relative entropy values. The type of nonequilibrium phase change can be distinguished by inlet-relative entropy. Cavitation makes the choke mass flow rate decrease due to the drop in the speed of sound. Condensation mainly occurs on the leading edge of the main blade at a large mass flow rate, but cavitation occurs on the splitter. The condensation is more evenly distributed on the main blade, but the cavitation is mainly centered on the leading edge.

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“…Due to this advantage, sCO 2 has been used in many fields, including as a compressor, turbine and seal [13][14][15][16][17][18][19]. For example, Pei et al [20] proposed a numerical model to study the flow behavior and performance of a centrifugal compressor influenced by leading edge profiles. It was found that the suction peak at the leading edge was reduced with the growth of the long-short ration of the leading edge.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Flow Behavior and Energy Consumption of Supercritical CO2 Sealing Film Influenced by Different Surface Grooves

Yang,

Wang,

Bai

2023

Materials

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The Brayton cycle system, as a closed cycle working under high-temperature, high-pressure and high-speed conditions, presents significant prospects in many fields. However, the flow behavior and energy efficiency of supercritical CO2 is severely influenced by the structures of face seals and the sealing temperature, especially when the sealing gas experiment is the supercritical transformation process. Therefore, a numerical model was established to investigate the high-temperature flow behavior and energy consumption of face seals with different surface grooves. The effects of the operation parameters and groove structure on the temperature distribution and sealing performance are further studied. The obtained results show that the supercritical effect of the gas film has a more obvious influence on the flow velocity uθ than ur. Moreover, it can be found that the temperature distribution, heat dissipation and leakage rate of the gas face seals present a dramatic change when the working condition exceeds the supercritical point. For the spiral groove, the change rate of heat dissipation becomes larger, from 3.6% to 8.1%, with the increase in sealing pressure from 15 to 50 MPa, when the temperature grows from 300 to 320 K. Meanwhile, the open force maintains a stable state with the increasing temperature and pressure even at the supercritical point. The proposed model could provide a theoretical basis for seal design with different grooves on the supercritical change range in the future.

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Effects of leading edge profiles on flow behavior and performance of supercritical CO2 centrifugal compressor

Cited by 14 publications

References 54 publications

Research Advances in the Application of the Supercritical CO2 Brayton Cycle to Reactor Systems: A Review

Research Advances in the Application of the Supercritical CO2 Brayton Cycle to Reactor Systems: A Review

Effects of Near-Critical Condensation and Cavitation on the Performance of S-CO2 Compressor

High-Temperature Flow Behavior and Energy Consumption of Supercritical CO2 Sealing Film Influenced by Different Surface Grooves

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