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Turbomachinery rotor forcesThe fluid-induced forces, both steady and unsteady, acting upon an impeller of a centrifugal pump, and impeller blade-diffuser vane interaction in centrifugal pumps with vaned radial diffusers were evaluated experimentally and theoretically. Knowledge of the steady and unsteady forces, and the associated rotordynamic coefficients are required to effectively model the rotor dynamics of the High Pressure Fuel Turbopump (HPFTP) of the Space Shuttle Main Engine (SSME). These forces and rotordynamic coefficients were investigated using different impellers in combination with volutes and vaned diffusers, and axial inducers. These rotor forces are global. Local forces and pressures are also important in impeller-diffuser interaction, for they may cause cavitation damage and even vane failures. Thus, in a separate investigation, impeller wake, and impeller blade and diffuser vane pressure measurements were made. The nature of the rotordynamic forces is discussed, the experimental facility is described, and the measurements of unsteady forces and pressure are reported together with a brief and incomplete attempt to calculate these flows.
Document ID
19900019536
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Arndt, Norbert
(California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1988
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-CR-183779
REPT-249.9
NAS 1.26:183779
Accession Number
90N28852
Funding Number(s)
CONTRACT_GRANT: NAS8-33108
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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