پنجشنبه, ۱۷ دی ۱۳۹۴، ۰۵:۴۰ ب.ظ
Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps
Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps
ABSTRACT
A commercial
computational fluid dynamics (CFD) computer code was employed to compute the
flow field from 105 percent down to 21. percent of the 4525 gpm BEP flow rate of a 1785
rpm, 1500 specific speed impeller of 13,000 suction specific speed. Suction and
discharge recirculation were both computed, and the results agreed in all
details that have also been observed experimentally. The insights gained from
these computations led to the design and construction of a new impeller aimed a
smoother minimum flow operation. The same code was then applied to the
computation of the highly three-dimensional flow field of the diffusing crossover of a 325
gpm, 3580 rpm,
900 to 1000 specific speed multistage volute pump. Flow distortions produced by
this crossover were computed at the outlet to the impeller of the succeeding
stage, and the effects on performance were estimated. Candidate improvements to
the crossover were evaluated with the same code, illustrating the utility of
CFD as a design and improvement tool. This tool can be used to improve pump
performance and reliability in many different areas.
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Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps
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