The influence of blade configuration on cavitation performance of a condensate pump

Kang, Can; Mao, Ning; Zhang, Wenbin; Gu, Yiping

doi:10.1016/j.anucene.2017.07.028

Cited by 19 publications

(9 citation statements)

References 18 publications

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“…Area ratio Y represents the ratio of the impeller outlet area to the volute throat area. Table 1 presents that the efficiencies and heads obtained by the different combinations of eight different impeller geometric parameters, which suggest the influence of the different geometric parameters, parameter combination on efficiency, and the difference in the head [21]. Multiple linear regression was selected by this paper to analyze the relationship among each parameter, efficiency, and the head.…”

Section: Methodsmentioning

confidence: 99%

“…Given that each variable was different in the physical properties, they usually have different orders of magnitude and dimensions. When the regression equation was established directly, the regression coefficient was very often not directly comparable [21]. When variables vary largely in level, the role of the value of the higher numerical variable in the comprehensive analysis shall be highlighted, and the role of the comparatively lower numerical variable will be weakened if the raw data is directly used for analysis.…”

Section: Data Normalizationmentioning

confidence: 99%

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The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Zhao

Wang

et al. 2019

Processes

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Coast-down characteristics are the crucial safety evaluation factors of nuclear reactor coolant pumps. The energy stored at the highest moment of inertia of the reactor coolant pump unit is utilized to maintain a normal coolant supply to the core of the cooling loop system for a short period of time during the coast-down transition. As a result of the high inertia moment of the rotor system, the unit requires a high reliability of the nuclear reactor coolant pump and consumes considerable energy in the start-up and normal operation. This paper considers the operational characteristics of the coast-down transition process based on the existing hydraulic model of the nuclear reactor coolant pump. With the implementation of an orthogonal test, the hydraulic performance of the nuclear reactor coolant pump was optimized, and the optimal combination of impeller geometrical parameters was selected using multivariate linear regression to prolong the coast-down time of the reactor coolant pump and to avoid serious nuclear accidents.

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Section: Methodsmentioning

confidence: 99%

Section: Data Normalizationmentioning

confidence: 99%

The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Zhao

Wang

et al. 2019

Processes

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“…Here, the Schnerr-Sauer model based on the Rayleigh-Plesset equation was used. Details of the numerical strategy can be found in Kang et al (2017b). In the present study, numerical simulations were implemented using the commercial CFD code ANSYS CFX.…”

Section: Unsteadymentioning

confidence: 99%

Cavitation Characteristics during Startup Process of a Condensate Pump with Splitter Blades

2022

JAFM

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The present study aims to describe characteristics of cavitation during the startup process of a condensate pump. The pump is featured by an impeller equipped with five splitter blades. A computational fluid dynamics (CFD) work was conducted to plumb the evolution of cavitation in the pump. Effect of the volumetric flow rate on instantaneous cavitation patterns as the rotational speed of the pump increased was analyzed. The results show that high resistance to cavitation of the pump depends greatly on large area of the impeller eye, which is related to the deployment of the splitter blades. The splitter blades are insignificantly affected by cavitation. During the startup process, both the pump head and the pump efficiency vary drastically, which is insensitive to the flow rate. At a net positive suction head (NPSH) of 2.0 m, high flow rates are responsible for intensified cavitation. High volume fraction of cavitation arises near the inlet of long blades. As the rotational speed increases, the evolution of cavitation is featured by intermittency and diversified cavity patterns. Furthermore, the sum of the volume fraction of cavitation fluctuates with continuously increasing rotational speed.

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“…This puts the downstream components at risk of being damaged since in most cases the flow passage gets blocked by cavitation bubbles. 1,2 The detrimental effects of cavitation include reduced hydraulic performance, violent structural vibration, noise, pitting and erosion, which is caused by the shockwaves generated during the violent bubble collapse on the internal parts. 3 In view of this, early cavitation detection and suction performance improvement are very necessary to avoid pump breakdown since the phenomenon cannot be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Unsteady flow characteristics and cavitation prediction in the double-suction centrifugal pump using a novel approach

Pei

Osman

Yuan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The recent advances in centrifugal pump design do not only require a better suction performance but also there have been attempts to reduce design time at a lower cost. The traditional trial-and-error optimization design method, however, depends on the designer's experience, which requires longer cycles. This is because the computational process of calculating the net positive suction head required (NPSHr) involves several calculation steps and this consumes a lot of computational time. An investigation was therefore carried out to test a novel NPSHr prediction method in a double-suction centrifugal pump using unsteady numerical simulations. In the new approach, a new boundary pair was introduced and an algorithm was used to estimate a good value for a static pressure value that correlates to a 3% drop in pump head to determine the critical cavitation point. Experiments were conducted to validate the hydraulic performance and the cavitation model. The NPSHr and the characteristic “sudden” head-drop were very well predicted by the novel approach in only three simulation steps. The internal flow analysis showed that for 0.6 Q d, the flow around the volute tongue was uneven at NPSH = 10.06 m, inducing flow separation and recirculation at the tongue region. Attached cavities were also observed around the suction ring in the spiral suction domain. The pressure fluctuations were analyzed also and the dominant frequency at the pump outlet and tongue region was the blade passing frequency. Consequently, the novel approach proved very robust and efficient in NPSHr prediction and would be a good alternative to shorten simulation time during cavitation optimization design process in centrifugal pumps.

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The influence of blade configuration on cavitation performance of a condensate pump

Cited by 19 publications

References 18 publications

The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Cavitation Characteristics during Startup Process of a Condensate Pump with Splitter Blades

Unsteady flow characteristics and cavitation prediction in the double-suction centrifugal pump using a novel approach

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