Feed-pump hydraulic performance and design improvement, Phase I: research program design. Final report. Volume 1 Page: 24 of 155
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consequences of two additional fundamental conditions of the flow
of the working fluid. First, the forces arising from the pressure
distributions imposed upon both the rotor and the stator must be
predicted and/or measured; and second, the energy conversion process
must be assessed. It is now well established that the energy
conversion process is a function of time-varying or unsteady pressure
fluctuations. Thus, we may expect the resultant forces to be
unsteady as well. The forces imposed on a pump impeller, arising
both from flow within the impeller and from interaction with flow
outside the impeller in a volute or diffuser, are not well under-
stood. Therefore, the procedure is first to evaluate the time-
averaged conditions of radial and axial thrust. Ihen, in the area of
unsteady flow, the concept of rotating damping, forces due to
perturbations of the impeller channel flow, and the impeller/volute
or impeller/ diffuser interaction must be considered.
4.5 Flow Instability
Flow instability in a pump system is created by the interaction of an
unstable pump head-capacity curve with a system that has unstable
characteristics. Power plant feedwater systems have the requisite
unstable characteristics, and a stable pump head-capacity curve
is necessary for successful operation of the system. Pump designers
use empirical methods to produce the needed pump characteristics,
but basic knowledge of this subject is incomplete.
4.6 Design Methods and Research by Manufacturers
Most pump manufacturers use design methods that are proprietary and
are based on a large empirical data base. Ihe bulk of their research
is internally funded, proprietary, and if published, not until long
after completion. Pump manufacturers tend not to perform basic
research; therefore, this work is generally conducted by research
laboratories and universities.
4.7 Feed Pump Specifications
Our survey of architect/engineers indicates that completion of the
research and development program will help them in areas such as
S-4
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Brown, W. H.; Gopalakrishnan, S.; Fehlau, R.; Thompson, W. E. & Wilson, D. G. Feed-pump hydraulic performance and design improvement, Phase I: research program design. Final report. Volume 1, report, March 1, 1982; United States. (https://digital.library.unt.edu/ark:/67531/metadc1070017/m1/24/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.