NASA Technical Reports Server (NTRS) : Computer pdf

NASA Technical Reports Server (NTRS) : Computer

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The Space Shuttle main engine high-pressure oxygen turbopumps have not experienced the sevice life required of them. This insufficiency has been due in part to the shortened life of the bearings. To improve the life of the existing turbopump bearings, an effort is under way to investigate bearing modifications that could be retrofitted into the present bearing cavity. Several bearing parameters were optimized using the computer program SHABERTH, which performs a thermomechanical simulation of a load support system. The computer analysis showed that improved bearing performance is feasible if low friction coefficients can be attained. Bearing geometries were optimized considering heat generation, equilibrium temperatures, and relative life. Thermal gradients through the bearings were found to be lower with liquid lubrication than with solid film lubrication, and a liquid oxygen coolant flowrate of approximately 4.0 kg/s was found to be optimal. This paper describes the analytical modeling used to determine these feasible modifications to improve bearing performance

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 3/1/1988
• Year: 1988
• Book Topics/Themes: NASA Technical Reports Server (NTRS), BEARINGS, COMPUTER AIDED DESIGN, CRYOGENIC FLUIDS, RETROFITTING, REVISIONS, SERVICE LIFE, SPACE SHUTTLE MAIN ENGINE, TURBINE PUMPS, COMPUTER PROGRAMS, FRICTION, LIQUID OXYGEN, SIMULATION, SOLID LUBRICANTS, THERMODYNAMICS, THIN FILMS, Armstrong, Elizabeth S., Coe, Harold H

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