NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Inducer Hydrodynamic Load Measurement DevicesMarshall Space Flight Center (MSFC) has demonstrated two measurement devices for sensing and resolving the hydrodynamic loads on fluid machinery. The first - a derivative of the six component wind tunnel balance - senses the forces and moments on the rotating device through a weakened shaft section instrumented with a series of strain gauges. This "rotating balance" was designed to directly measure the steady and unsteady hydrodynamic loads on an inducer, thereby defining both the amplitude and frequency content associated with operating in various cavitation modes. The second device - a high frequency response pressure transducer surface mounted on a rotating component - was merely an extension of existing technology for application in water. MSFC has recently completed experimental evaluations of both the rotating balance and surface-mount transducers in a water test loop. The measurement bandwidth of the rotating balance was severely limited by the relative flexibility of the device itself, resulting in an unexpectedly low structural bending mode and invalidating the higher frequency response data. Despite these limitations, measurements confirmed that the integrated loads on the four-bladed inducer respond to both cavitation intensity and cavitation phenomena. Likewise, the surface-mount pressure transducers were subjected to a range of temperatures and flow conditions in a non-rotating environment to record bias shifts and transfer functions between the transducers and a reference device. The pressure transducer static performance was within manufacturer's specifications and dynamic response accurately followed that of the reference.
Document ID
20020075577
Document Type
Conference Paper
Authors
Skelley, Stephen E.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Zoladz, Thomas F.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 20, 2013
Publication Date
April 1, 2002
Publication Information
Publication: 38th JANNAF Combustion Subcommittee Meeting
Volume: 1
Subject Category
Instrumentation And Photography
Distribution Limits
Public
Copyright
Other

Related Records

IDRelationTitle20020075551Analytic Primary38th JANNAF Combustion Subcommittee Meeting
No Preview Available