Technical Development for SCO_{2} Advanced Energy Conversion
This report is divided into four parts. First part of the report describes the methods used to measure and model the flow of supercritical carbon dioxide (SCO_{2}) through annuli and straightthrough labyrinth seals. The effects of shaft eccentricity in small diameter annuli were observed for lengthtohydraulic diameter (L/D) ratios of 6, 12, 143, and 235. Flow rates through toothcavity labyrinth seals were measured for inlet pressures of 7.7, 10, and 11 MPa with corresponding inlet densities of 325, 475, and 630 kg/m^{3}. Various leakage models were compared to this result to describe their applicability in supercritical carbon dioxide applications. Flow rate measurements were made varying tooth number for labyrinth seals of same total length. Second part of the report describes the computational study performed to understand the leakage through the labyrinth seals using Open source CFD package OpenFOAM. Fluid Property Interpolation Tables (FIT) program was implemented in OpenFOAM to accurately model the properties of CO2 required to solve the governing equations. To predict the flow behavior in the two phase dome Homogeneous Equilibrium Model (HEM) is assumed to be valid. Experimental results for plain orifice (L/D ~ 5) were used to show the capabilities of the FIT model implemented inmore »
 Authors:

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 Univ. of Wisconsin, Madison, WI (United States)
 Texas A & M Univ., College Station, TX (United States)
 Publication Date:
 OSTI Identifier:
 1215518
 Report Number(s):
 DOE/NEUP113039
113039; TRN: US1600278
 DOE Contract Number:
 AC0705ID14517
 Resource Type:
 Technical Report
 Research Org:
 Univ. of Wisconsin, Madison, WI (United States); Texas A & M Univ., College Station, TX (United States)
 Sponsoring Org:
 USDOE Office of Nuclear Energy (NE)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 42 ENGINEERING; 36 MATERIALS SCIENCE; CARBON DIOXIDE; SUPERCRITICAL STATE; LENGTH; MECHANICAL SHAFTS; PRESSURE RANGE MEGA PA 0110; PRESSURE RANGE MEGA PA 10100; EXPERIMENTAL DATA; GEOMETRY; ORIFICES; SEALS; FLOW RATE; DENSITY; COMPARATIVE EVALUATIONS; ENERGY CONVERSION; DATA COVARIANCES; LEAKS; INTERPOLATION; TURBULENT FLOW; EQUILIBRIUM; VALIDATION; PARAMETRIC ANALYSIS; DESIGN; FLUID MECHANICS; COMPUTERIZED SIMULATION; MATHEMATICAL MODELS; HEAT EXCHANGERS; TEST FACILITIES; HEAT TRANSER; BUOYANCY; TEMPERATURE RANGE 02730400 K; OPENCYCLE COOLING SYSTEMS; COOLING TOWERS; FEASIBILITY STUDIES; BRAYTON CYCLE POWER SYSTEMS; SIZE; ECONOMIC ANALYSIS; ENERGY CONSUMPTION; WATER USE; OPTIMIZATION
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