Theoretical analysis to calculate axial thrust in multistage centrifugal pumps

Bhatia, Ankush

doi:10.1533/9780081001080.5.159

Cited by 2 publications

(5 citation statements)

References 4 publications

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“…With the development of computational fluid dynamics technology, it is possible to numerically study the transient dynamic characteristics of pumps, and there are quite a few relevant studies. Bhatia 9 and Shi et al 10 theoretically analyzed the generation mechanism of axial force, predicated the axial force of a submersible pump at different flow rates, and verified the reliability of the numerical calculation by comparing with the axial force tested on the prototype. Salvadori et al 11 analyzed the generation mechanism of axial force in multi-phase pumps, studied the variation pattern of axial forces on various impellers at different flow rates, and analyzed the influence of leakage flow to the axial thrust.…”

Section: Introductionmentioning

confidence: 90%

Research on transient dynamic characteristics of three-stage axial-flow multi-phase pumps influenced by gas volume fractions

Liu

Shi

et al. 2017

Advances in Mechanical Engineering

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The flow inside axial-flow type multi-phase pumps is unstable at the conditions of high-speed and high gas volume fractions. The transient dynamic characteristics induced by the unstable flow will lead to pump vibration. Using the standard k-e turbulence model, the standard wall equation, and the structured grid division technology, the transient dynamic characteristics of the pump at different gas volume fractions were computed by the SIMPLEC algorithm. The axial force and radial force on the pump were calculated by applying integral to the surface area of the computational domain. The results show that the pressurizing performance of the impeller degrades, the dynamic reaction on the blades decreases, while the force acting on the hub increases with the increasing of gas volume fractions. If the gas volume fraction reaches to a certain value, the direction of axial force on the multi-phase pump will change. The radial forces on the first-and last-stage impellers are non-uniformly distributed, and the pressure fluctuation is obvious, while the radial forces on the second-stage impeller and guide vanes are uniformly distributed, and the fluctuation amplitude is small. With the increasing of gas volume fractions, the radial forces on various components decrease gradually.

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Section: Introductionmentioning

confidence: 90%

Research on transient dynamic characteristics of three-stage axial-flow multi-phase pumps influenced by gas volume fractions

Liu

Shi

et al. 2017

Advances in Mechanical Engineering

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“…Moreover, in the case of mechanically polluted liquids, the fins on the impeller rear disc throw mechanical impurities away in the centrifugal direction, thus protecting the stuffing box. The vanes protecting the seal by throwing mechanical impurities away at the impeller inlet are made as finned elements of the disc (Cao et al 2015;Wilk and Wilk 1996a).…”

Section: Introductionmentioning

confidence: 99%

“…The issues related to the distribution of pressure in the turbomachinery near-impeller space are thoroughly discussed in reference literature. In the case of pumps, the problem involves analysing axial thrust characteristics (Bhatia 2014;Dong and Chu 2016a, b;Gantar et al 2002;Golovin et al 1989;Godbole et al 2012;Hong et al 2013;Iino et al 1980;Jedral 2001;Kalinichenko and Suprun 2012;Karaskiewicz 2013;Kim and Palazzolo 2016;Lefor et al 2015;Lugova et al 2014;Matsui and Mugiyama 2009;Piesche 1989;Rohatgi and Reshotko 1974;Shimura et al 2012;Wang et al 2013;Wilk 2003bWilk , 2009Zhou et al 2013) or volume losses resulting from untight sealing (Ayad et al 2016;Bhatia 2014;Cao et al 2015;Gantar et al 2002;Kim and Palazzolo 2016;Lefor et al 2015;Liu et al 2016;Shimura et al 2012;Torabi and Nourbakhsh 2016;Wang et al 2016;Wilk and Wilk 2001). So far, experimental (Ayad et al 2016;Dong and Chu 2016b;Gantar et al 2002;Godbole et al 2012;Hong et al 2013;Iino et al 1980;Lefor et al 2015;Nemd...…”

Section: Introductionmentioning

confidence: 99%

“…So far, experimental (Ayad et al 2016;Dong and Chu 2016b;Gantar et al 2002;Godbole et al 2012;Hong et al 2013;Iino et al 1980;Lefor et al 2015;Nemdili and Hellmann 2007;Owen and Pincombe 1980;Piesche 1989;Wilk and Wilk 1996b;Wilk 2008;Zhou et al 2013) and computational (Ayad et al 2016;Cao et al 2015Cao et al , 2016Dong and Chu 2016b;Dykas and Wilk 2008;Golovin et al 1989;Hong et al 2013;Karaskiewicz 2013;Kim and Palazzolo 2016;Lefor et al 2015;Liu et al 2016;Matsui and Mugiyama 2009;Piesche 1989;Rohatgi and Reshotko 1974;Shimura et al 2012;Torabi and Nourbakhsh 2016;Watanabe et al 2016;Zhou et al 2013) tests have been carried out. Selected works are devoted to cases of the centripetal or centrifugal flow (Ayad et al 2016;Bhatia 2014;Cao et al 2015;Dong and Chu 2016a;Gantar et al 2002;Golovin et al 1989;Iino et al 1980;Karaskiewicz 2013;Lefor et al 2015;Liu et al 2016;…”

Section: Introductionmentioning

confidence: 99%

“…Much less attention (Bhatia 2014;Daqiqshirazi et al 2014;Dong and Chu 2016a;El-Naggar 2013;Torabi and Nourbakhsh 2016) is given to the problem of energy consumption caused by the fluid friction against a rotating disc. The basic reference literature items (Daily and Nece 1960a, b;Gulich 2014;Lazarkiewicz and Troskolanski 1965;Piesche 1989;Pfleiderer 1961;Rohatgi and Reshotko 1974;Stepanoff 1957) present relations for smooth-surfaced discs, whereas in many cases it is the disc fins that produce a change in the distribution of pressure.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Measurements the Rise in Power Consumption Resulting from the Use of a Finned Rotating Disc at a Centrifugal Water Flow

Wilk

2018

Iran J Sci Technol Trans Mech Eng

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The pump structure may involve using fins on the impeller discs to reduce axial thrust. The fins are also used to reduce pressure acting on the discharge-side stuffing box, throw mechanical impurities away and protect the seal against mechanical impurities at the pump impeller inlet. Extensive laboratory tests were performed on finned discs at the water centrifugal flow for different fin widths and gaps between fins and the casing and for different water flow rates. The resulting change in power consumption was determined compared to unfinned discs. The analysis results indicate that fitting the disc with fins involves an increase in power consumption. The consumption rise depends on the centrifugal volumetric flow rate, the fin width and the size of the gap. The dependence of power consumption on the gap size is nonmonotonic-the gap can be optimized to minimize power consumption. The determination of the rise in the consumption of power resulting from fitting the disc with fins and depending on the centrifugal volumetric flow rate is an original outcome of the analysis presented in this paper. The dependence was defined for fins with different values of width and for different sizes of gap. The presented results of the testing can be used in the analysis of power consumption of both finned and unfinned rotating discs. The analysis of power consumption in the impeller pump axial thrust balancing system using balancing vanes is another example of the application of the obtained results.

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Theoretical analysis to calculate axial thrust in multistage centrifugal pumps

Cited by 2 publications

References 4 publications

Research on transient dynamic characteristics of three-stage axial-flow multi-phase pumps influenced by gas volume fractions

Research on transient dynamic characteristics of three-stage axial-flow multi-phase pumps influenced by gas volume fractions

Laboratory Measurements the Rise in Power Consumption Resulting from the Use of a Finned Rotating Disc at a Centrifugal Water Flow

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