Publication detail
The modification of the mixed flow pump with respect to its stability
KLAS, R. POCHYLÝ, F.
Czech title
Modifikace diagonálního čerpadla s ohledem na jeho stabilitu
English title
The modification of the mixed flow pump with respect to its stability
Type
journal article - other
Language
en
Original abstract
This paper is focused on the CFD simulation of the mixed flow pump (i.e. radiaxial pump) with the aim to detect the reasons of Y-Q characteristic instability. The main reasons of pressure pulsations were detected by means of the analysis of velocity and pressure fields inside the pump combined with the theoretical approach. Consequently, the modifications of spiral case and pump suction area were made based on the knowledge of flow conditions and the shape of dissipation function. The primary design of pump geometry was modelled as the base model serving for the comparison of individual modification influence. The basic experimental data are available for this geometry. This approach replaced the more complicated and with respect to convergence of all computational tasks more difficult calculation for the compressible liquid flow. The modification of primary pump consisted in inserting the three fins types. Subsequently, the evaluation of pressure pulsations, specific energy curves and visualization of velocity fields were chosen as the criterion for successful design.
Czech abstract
Tento příspěvek je zaměřený na CFD simulaci diagonálního čerpadla s cílem odhalit příčiny nestability Y-Q charakteristiky. Analýzou rychlostního a tlakové pole v interiéru čerpadla v kombinaci s teoretickým přístupem byly detekovány základní příčiny tlakových pulsací. Ze znalosti proudových poměrů a tvaru disipační funkce bylo následně přikročeno k úpravám spirálního tělesa a sacího prostoru. Jako základní model sloužící k porovnání vlivu jednotlivých úprav byla vymodelována původní geometrie čerpadla, pro níž jsou k dispozici základní experimentální data. Takový přístup nahradil komplikovanější a z hlediska konvergence celé úlohy náročnější výpočet proudění se stlačitelnou kapalinou. Modifikace původního čerpadla spočívala ve vložení tří typů žeber. Kritériem pro posouzení úspěšnosti se následně stalo vyhodnocení tlakových pulsací, křivky měrné energie a vizualizace rychlostního pole.
English abstract
This paper is focused on the CFD simulation of the mixed flow pump (i.e. radiaxial pump) with the aim to detect the reasons of Y-Q characteristic instability. The main reasons of pressure pulsations were detected by means of the analysis of velocity and pressure fields inside the pump combined with the theoretical approach. Consequently, the modifications of spiral case and pump suction area were made based on the knowledge of flow conditions and the shape of dissipation function. The primary design of pump geometry was modelled as the base model serving for the comparison of individual modification influence. The basic experimental data are available for this geometry. This approach replaced the more complicated and with respect to convergence of all computational tasks more difficult calculation for the compressible liquid flow. The modification of primary pump consisted in inserting the three fins types. Subsequently, the evaluation of pressure pulsations, specific energy curves and visualization of velocity fields were chosen as the criterion for successful design.
Keywords in Czech
diagonální čerpadlo, stabilita, pulsace tlaku, CFD analýza, žebro, disipace energie
Keywords in English
mixed flow pump, stability, pulsation, CFD analysis, fin, energy dissipation
RIV year
2011
Released
31.10.2011
Publisher
Ústav materiálov a mechaniky strojov SAV a Strojnícka fakulta STU
Location
Bratislava
ISSN
0039-2472
Volume
62
Number
2
Pages from–to
93–103
Pages count
10
BIBTEX
@article{BUT50973,
author="Roman {Klas} and František {Pochylý},
title="The modification of the mixed flow pump with respect to its stability",
year="2011",
volume="62",
number="2",
month="October",
pages="93--103",
publisher="Ústav materiálov a mechaniky strojov SAV a Strojnícka fakulta STU",
address="Bratislava",
issn="0039-2472"
}