The flow field in a centrifugal pump with a large tongue gap and back blades

Cai, Jiancheng; Guzzomi, Andrew

doi:10.1007/s12206-014-1013-6

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…A number of studies [16][17][18] reported that an increment in the tongue-impeller gap could reduce pressure pulsations and the overall radial force. However, a significant portion of the flow will reenter the volute instead of being discharged to the outlet duct because of the large gap between the tongue and impeller that will decrease the pump performance [19]. Barrio et al [20] reported the unsteady flow behavior close to the tongue region of a single-suction volutetype centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

Tao

Yuan

Liu

et al. 2019

Chin. J. Mech. Eng.

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The annular volute is typically used in a slurry pump to reduce the collisions between solid particles and the volute tongue and to achieve a better resistance to blocking. However, only limited studies regarding annular volutes are available, and there is no systematic design method for annular volutes. In this study, the influence of volute casing cross-sectional flow area on the hydraulic loss, pressure pulsations, and radial force under varying working conditions in a centrifugal ceramic pump are discussed in detail. Experimental tests were conducted to validate the numerical results. The results indicated that, when the volute casing flow area increases, the hydraulic performance decreases marginally under the rated working conditions, but increases at the off-design points, specifically under large flow condition. However, the volute casing with a larger flow area has a wider high-efficiency region. In addition, the increase in the volute casing flow area will decrease the pressure pulsations in the volute, regardless of the working condition, and decrease the radial force on the shaft, therefore, providing an improved pump operational stability. It is anticipated that this study will be of benefit during the design of annular volutes. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Introductionmentioning

confidence: 99%

Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

Tao

Yuan

Liu

et al. 2019

Chin. J. Mech. Eng.

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“…Nowadays, turbomachinery plays a pivotal role in many fields of national economy [1][2][3]. As parts of turbomachinery components, centrifugal pumps have been widely applied for water supplying system, cooling system, agriculture irrigation system, and so on.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Distribution and Evolution Characteristics of an Acoustic Field in the Time Domain of a Centrifugal Pump Based on Powell Vortex Sound Theory

2019

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The acoustic field distribution and evolution characteristics in a time domain inside a centrifugal pump are studied. During the fluid motion process, the acoustic source and acoustic pressure are basically less than 0, and the minimum value of the two parameters is distributed near the tongue. Additionally, the concentration, break, extend, migration and reaggregation phenomena of the minimum acoustic source region exist. Specifically, as the blade passes through the tongue, the minimum acoustic source region concentrates on the tongue firstly, then extends and migrates downstream slightly with the blade motion, and aggregates again around the tongue, which results in the similar evolution characteristics of acoustic pressure. Moreover, the standard deviation (STD) of acoustic source mainly focuses near the pressure side of blade tail and volute tongue, and the maximum STD is located at the tongue. Compared with the source component induced by stretching of the vortex, the source component induced by non-uniformity of fluid kinetic energy is closer to the overall acoustic source. Take the tongue as an example, at various rotational speeds, the STD proportions of the two components are about 5% and 95%, respectively. This study discusses the generation, distribution and evolution characteristics of acoustic field, which lays a foundation to analyze the acoustic field propagation mechanism of centrifugal pumps.

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“…A lot of investigation, such as flow in impeller and volute of the centrifugal pump, cavitation, vibration etc., have been finished by CFD numerical simulation. As the centrifugal pump performance is relative stable, being considered time-independent during pump running process, a steady numerical method is frequently used to simulate the pump characteristics for comparing and optimizing pump structure and performance [1][2][3][4][5][6] . However, a frozen rotor method used in steady simulation of centrifugal pump assumes the impeller has an unchanged location against the volute, and it is completely different from the true case, in which the boundary condition of a fixed point at the exit of the impeller changes with rotation.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Relative Position of a Centrifugal Impeller Blade Against the Tongue on the Steadily Simulated Pump Performance

Ma¹,

Ma²,

Li³

2018

dtcse

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Abstract. The performance of a single-stage centrifugal pump with designed flow rate of 0.028m 3 /s, head of 20m and rotating speed of 1450rpm have been steadily simulated for four geometric models, in which the angle between the impeller blade and the tongue is 44°, 29°, 15°and 0° (where the blade meets the tongue) separately. The comparison of the simulated results to the experimental data show that the computed head and power are lower than that of the experiment, but the efficiency is up to 12.0% higher than the test result. The steadily simulated characteristics of the pump in four cases change with the blade relative location against the tongue. At the small flow rate of 0.6Qd (Qd is the designed flow rate), the pump head fluctuation ΔH is nearly 2.14m, pump efficiency fluctuation Δη reaches 3.06%, and the impeller efficiency variation Δηi reaches up to 8.0%. At the high flow rate of 1.4Qd, ΔH equals 1.45m, Δη is approximately 6.68%, and Δηi is 1.03%. Under the design condition, the pump performance in four cases are almost the same show that the angle between the impeller blade and the tongue has neglectable effect. At last, unsteady simulation of the pump performance has been carried out and compared to experimental result. It indicates that the unsteady simulation is in agreement with the experiments. As a result, careful consideration should be taken while optimizing the pump performance by a method of steady simulation.

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The flow field in a centrifugal pump with a large tongue gap and back blades

Cited by 17 publications

References 14 publications

Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

A Numerical Study on the Distribution and Evolution Characteristics of an Acoustic Field in the Time Domain of a Centrifugal Pump Based on Powell Vortex Sound Theory

Effects of the Relative Position of a Centrifugal Impeller Blade Against the Tongue on the Steadily Simulated Pump Performance

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