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Appl. Sci. 2020, 10, 6824 12 of 13 1. The results predicted using the hydrostatic bearing analysis program of this study were similar to those of previous research, and the reliability of the developed analysis model was confirmed; 2. Under the design conditions, a pressure ratio existed that maximized the stiffness of the radial bearing, in consideration of which the orifice diameter was determined; 3. Based on the rotordynamic analysis, it was predicted that no critical speed would be presented below the rated speed and no instability would occur, indicating a wide range of operating speeds; 4. Tests performed on the manufactured pump-drive turbine in the sCO2 test facility confirmed that successful operation is possible for the designed sCO2 cycle, and the measured rotor vibration was 2 μm at the rated speed; 5. The test results showed that hydrostatic bearing with liquid CO2 as the lubricant can be successfully applied to the sCO2 turbomachinery. Author Contributions: Conceptualization, D.L., M.P. and E.Y.; methodology, B.K. and M.P.; software, D.L. and H.L.; validation, M.P., H.L. and E.Y.; formal analysis, D.L. and B.K.; writing—original draft preparation, D.L.; writing—review and editing, M.P.; project administration, E.Y.; funding acquisition, E.Y. All authors have read and agreed to the published version of the manuscript. Funding: This work was supported by the Korea Ministry of Land, Infrastructure and Transportation. It was also supported by the Korean Agency for Infrastructure Technology Advancement (Project No.: 19IHTP-B151621-01-000000). The work was partially supported by National Research Council of Science and Technology (NST) grant funded by the Ministry of Science and ICT, Korea (Grant No. KIMM-SC1270). Conflicts of Interest: The authors declare no conflict of interest. Nomenclature Ao C [C] Cd D f h [K] L [M] p pa pe ps pr q R x, y, z μ ρ ω θ References orifice area radial clearance damping matrix orifice discharge coefficient bearing diameter force vector film thickness stiffness matrix bearing length mass matrix film pressure ambient pressure discharge pressure supply pressure recess pressure displacement vector bearing radius Cartesian coordinates viscosity of lubricant density of lubricant rotating speed circumferential coordinate 1. Conboy, T.; Wright, S.; Pasch, J.; Fleming, D.; Rochau, G.; Fuller, R. Performance characteristics of an operating supercritical CO2 brayton cycle. J. Eng. Gas Turbines Power 2012, 134, 111703. [CrossRef] 2. Conboy, T.; Pasch, J.; Fleming, D. Control of a Supercritical CO2 Recompression Brayton Cycle Demonstration Loop. J. Eng. Gas Turbines Power 2013, 135, 111710. [CrossRef]PDF Image | Development of Pump-Drive Turbine Module Super CO2 Application
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