CFD investigation of a centrifugal compressor derived from pump technology for supercritical carbon dioxide as a working fluid

Kim, Seong Gu; Lee, Jekyoung; Ahn, Yoonhan; Lee, Jeong Ik; Addad, Yacine; Ko, Bockseong

doi:10.1016/j.supflu.2013.12.017

Cited by 72 publications

(31 citation statements)

References 5 publications

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“…was observed. This preliminary experiment is consistent with the previous studies [14,21] which reported that the compressor operation is stable near the Further experiments to measure the compressor performance in the on-and off-design conditions will be conducted. Further experiments to measure the thrust loads, windage losses and compressor vibration are planned as well.…”

Section: Current Status Of S-co 2 Integral Experiments Loopsupporting

confidence: 88%

“…To validate the predicted performance, an integral test facility of the SeCO 2 cycle must be built. The first step to evaluate the SeCO 2 cycle performance is to construct and measure the actual performance of a main compressor, since the main compressor operates the closest to the critical point where fluid properties vary most significantly among all other cycle components [10,14]. The major technical challenge is the main compressor stable operation near the critical point which determines the overall performance of the Prior to describing the SeCO 2 integral test facilities, the closed gas Brayton cycle test in the SNL (Sandia National Lab) is briefly described.…”

Section: Introductionmentioning

confidence: 99%

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Design consideration of supercritical CO2 power cycle integral experiment loop

Ahn

Lee

Kim

et al. 2015

Energy

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Section: Current Status Of S-co 2 Integral Experiments Loopsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Design consideration of supercritical CO2 power cycle integral experiment loop

Ahn

Lee

Kim

et al. 2015

Energy

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“…It has been proven to be precise and effective by Kim S.G. et al [25]. In the database, "CO2RK" represents the working fluid carbon dioxide.…”

Section: Governing Equationsmentioning

confidence: 99%

“…[24] presented a novel modeling approach and the corresponding computer simulation of the SCO 2 flow inside a high-speed compact centrifugal compressor. Kim S.G. et al [25] conducted a 3D numerical study for the full SCO 2 compressor geometry including diffuser and volute. The predictions were compared with measurements obtained from the constructed SCO 2 compressor test facility.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Unsteady Flow Characteristics of a SCO2 Centrifugal Compressor

et al. 2017

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Supercritical carbon dioxide (SCO 2 ) is a vital working fluid in the application of power units and its high density helps to achieve a compact mechanical structure. Centrifugal compressors are of vital use in various kinds of equipment. In this paper, a SCO 2 centrifugal compressor of large input power and mass flow rate is designed and numerically investigated. A thorough numerical analysis of the unsteady flow field in the centrifugal compressor is performed in ANSYS-CFX. The computation adopts hexahedral mesh, finite volume method, and the RNG k-ε two-equation turbulence model. Streamlines, temperature, pressure, and Mach number distributions at different time steps in one revolution period are covered to present the unsteady effect of turbomachinery. Meanwhile, the force on a single rotor blade is monitored to investigate the frequency components of exciting force, thus providing the foundation for vibration analysis. Moreover, the torque, output power, pressure ratio, and isentropic efficiency in the steady and the unsteady time-averaged condition are calculated and compared with the design condition to measure the validity of the design. In summary, the unsteady computation result reveals that the unsteady flow characteristics are prominent in the designed compressor and the design of impeller and diffuser meet the requirement.

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“…In their calculation, the realizable k − ε turbulence model was employed. Kim (2014) carried out a comparison between CFD and experimental results [18]. It was found that when the inlet parameter was far away from the critical point, CFD calculation could get fairly good results.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Design and Model Assessment of a Supercritical CO2 Compressor

et al. 2018

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Abstract:The compressor is a key component in the supercritical carbon dioxide (SCO 2 ) Brayton cycle. In this paper, the authors designed a series of supercritical CO 2 compressors with different parameters. These compressors are designed for 100 MWe, 10 MWe and 1 MWe scale power systems, respectively. For the 100 MWe SCO 2 Brayton cycle, an axial compressor has been designed by the Smith chart to test whether an axial compressor is suitable for the SCO 2 Brayton cycle. Using a specific speed and a specific diameter, the remaining two compressors were designed as centrifugal compressors with different pressure ratios to examine whether models used for air in the past are applicable to SCO 2 . All compressors were generated and analyzed with internal MATLAB programs coupled with the NIST REFPROP database. Finally, the design results are all checked by numerical simulations due to the lack of reliable experimental data. Research has found that in order to meet the de Haller stall criterion, axial compressors require a considerable number of stages, which introduces many additional problems. Thus, a centrifugal compressor is more suitable for the SCO 2 Brayton cycle, even for a 100 MWe scale system. For the performance prediction model of a centrifugal compressor, the stall predictions are compared with steady numerical calculation, which indicates that past stall criteria may also be suitable for SCO 2 compressors, but more validations are needed. However, the accuracy of original loss models is found to be inadequate, particularly for lower flow and higher pressure ratio cases. Deviations may be attributed to the underestimation of clearance loss according to the result of steady simulation. A modified model is adopted which can improve the precision to a certain extent, but more general and reasonable loss models are needed to improve design accuracy in the future.

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CFD investigation of a centrifugal compressor derived from pump technology for supercritical carbon dioxide as a working fluid

Cited by 72 publications

References 5 publications

Design consideration of supercritical CO2 power cycle integral experiment loop

Design consideration of supercritical CO2 power cycle integral experiment loop

Investigation on Unsteady Flow Characteristics of a SCO2 Centrifugal Compressor

Preliminary Design and Model Assessment of a Supercritical CO2 Compressor

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