Design Space of Foil Bearings for Closed Loop Supercritical CO2 Power Cycles Based on Three Dimensional Thermohydrodynamic AnalysesSource: Journal of Engineering for Gas Turbines and Power:;2016:;volume( 138 ):;issue: 003::page 32504Author:Kim, Daejong
DOI: 10.1115/1.4031433Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The closedloop Brayton cycle with supercritical CO2 (SCO2) as an operating fluid is an attractive alternative to conventional power cycles due to very high power density. Foil gas bearings using CO2 are the most promising for small SCO2 turbomachinery but there are many problems to address: large power loss due to high flow turbulence, lack of design/analysis tool due to nonideal gas behavior, and lack of load capacity when they are used for large systems. This paper presents highlevel design/analysis tool involving threedimensional (3D) thermohydrodynamic (THD) analyses of radial foil bearings considering real gas effect and flow turbulence inside the film. Simulations are performed for radial foil bearing with 34.9 mm in diameter and lubricated with CO2 and N2 under various ambient conditions up to above 40 bar gauge pressure. The simulation results using the turbulence model still underpredict the measured data in open literature. However, the error between the prediction and measurements decreases as either speed or ambient pressure increases. In addition, general behavior of substantial increase in power loss with ambient pressure agrees with the measured data. The simulation results indicate the importance of detailed THD analysis of the foil bearings for prediction of power loss under severe turbulent condition. A conceptual layout of rotor system for 10 MWe SCO2 loop is also presented along with realistic rotor weight and bearing load. A hybrid foil bearing with diameter of 102 mm is suggested for gas generator rotor, and its power losses and minimum film thicknesses at various operating conditions are presented.
|
Show full item record
contributor author | Kim, Daejong | |
date accessioned | 2017-05-09T01:28:15Z | |
date available | 2017-05-09T01:28:15Z | |
date issued | 2016 | |
identifier issn | 1528-8919 | |
identifier other | gtp_138_03_032504.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/161043 | |
description abstract | The closedloop Brayton cycle with supercritical CO2 (SCO2) as an operating fluid is an attractive alternative to conventional power cycles due to very high power density. Foil gas bearings using CO2 are the most promising for small SCO2 turbomachinery but there are many problems to address: large power loss due to high flow turbulence, lack of design/analysis tool due to nonideal gas behavior, and lack of load capacity when they are used for large systems. This paper presents highlevel design/analysis tool involving threedimensional (3D) thermohydrodynamic (THD) analyses of radial foil bearings considering real gas effect and flow turbulence inside the film. Simulations are performed for radial foil bearing with 34.9 mm in diameter and lubricated with CO2 and N2 under various ambient conditions up to above 40 bar gauge pressure. The simulation results using the turbulence model still underpredict the measured data in open literature. However, the error between the prediction and measurements decreases as either speed or ambient pressure increases. In addition, general behavior of substantial increase in power loss with ambient pressure agrees with the measured data. The simulation results indicate the importance of detailed THD analysis of the foil bearings for prediction of power loss under severe turbulent condition. A conceptual layout of rotor system for 10 MWe SCO2 loop is also presented along with realistic rotor weight and bearing load. A hybrid foil bearing with diameter of 102 mm is suggested for gas generator rotor, and its power losses and minimum film thicknesses at various operating conditions are presented. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Design Space of Foil Bearings for Closed Loop Supercritical CO2 Power Cycles Based on Three Dimensional Thermohydrodynamic Analyses | |
type | Journal Paper | |
journal volume | 138 | |
journal issue | 3 | |
journal title | Journal of Engineering for Gas Turbines and Power | |
identifier doi | 10.1115/1.4031433 | |
journal fristpage | 32504 | |
journal lastpage | 32504 | |
identifier eissn | 0742-4795 | |
tree | Journal of Engineering for Gas Turbines and Power:;2016:;volume( 138 ):;issue: 003 | |
contenttype | Fulltext |