Investigation of the flow in the impeller side clearances of a centrifugal pump with volute casing

Will, Björn-Christian; Benra, Friedrich-Karl; Dohmen, Hans Josef

doi:10.1007/s11630-012-0536-3

Cited by 37 publications

(20 citation statements)

References 8 publications

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“…; −0.5 ≤ C qr < 0.02 (2b) Numerous researches, such as those by Kurokawa et al [23][24][25] and Poncet et al [15][16][17], show that the pressure distribution along the radius of the disk can be estimated with the core swirl ratio K, as a function of C qr , by Equation (3a) both with and without through-flow neglecting the turbulent wall shear stress. In Will et al [9][10][11], Equation (3b) is determined to evaluate the pressure distribution along the radius of the disk in a rotor-stator cavity with through-flow for incompressible, steady flow. Along the radius of the disk, the cross-sectional area of the cavity is like a diffusor.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Launder et al [8] investigated the instability patterns of the turbulent flow in a rotor-stator cavity. Will et al [9][10][11] investigated the flow structure in the side chamber of a radial pump based on numerical simulation. Coren et al [12], Long et al [13] and Barabas et al [14] conducted the experimental investigations on the cavity flow with large global circumferential Reynolds number Re.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine

Brillert

Dohmen

et al. 2018

IJTPP

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In radial pumps and turbines, the centrifugal through-flow in both the front and the back chambers is quite common. It strongly impacts the core swirl ratio, pressure distribution, axial thrust and frictional torque. In order to investigate these relationships experimentally, a test rig was designed at the University of Duisburg-Essen and described in this paper. Based on both the experimental and numerical results, correlations are determined to predict the impacts of the centrifugal through-flow on the core swirl ratio, the thrust coefficient and the moment coefficient. Two correlations respectively are determined to associate the core swirl ratio with the local through-flow coefficient for both Batchelor type flow and Stewartson type flow. The correlations describing the thrust coefficient and the moment coefficient in a rotor-stator cavity with centripetal through-flow (Hu et al., 2017) are modified for the case of centrifugal through-flow. The Daily and Nece diagram distinguishing between different flow regimes in rotor-stator cavities is extended with a through-flow coordinate into 3D. The achieved results provide a comprehensive data base which is intended to support the calculation of axial thrust and moment coefficients during the design process of radial pumps and turbines in a more accurate manner.

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Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine

Brillert

Dohmen

et al. 2018

IJTPP

Self Cite

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“…Power 2017, 2, 18 4 of 17 estimated with the core swirl ratio K both with and without through-flow. Will et al [16][17][18] determined Equation (3) to evaluate the pressure distribution along the radius of the disk for the incompressible, steady flow. It is obtained directly from the radial momentum equation when the turbulent shear stress is neglected.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Propuls. Power 2017, 2, 18 2 of 17 that are created in rotor-stator cavities leading to transition and eventually turbulence. Recent experimental investigations up to circumferential Reynolds numbers Re = 5 × 10 8 with and without through-flow have been conducted by Coren et al [13], Long et al [14] and Barabas et al [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Flow in a Rotor-Stator Cavity with Centripetal Through-Flow

Brillert

Dohmen

et al. 2017

IJTPP

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Daily and Nece distinguished four flow regimes in an enclosed rotor-stator cavity, which are dependent on the circumferential Reynolds number and dimensionless axial gap width. A diagram of the different flow regimes including the respective mean profiles for both tangential and radial velocity was developed. The coefficients for the different flow regimes have also been correlated. In centrifugal pumps and turbines, the centripetal through-flow is quite common from the outer radius of the impeller to the impeller eye, which has a strong influence on the radial pressure distribution, axial thrust and frictional torque. The influence of the centripetal through-flow on the cavity flow with different circumferential Reynolds numbers and dimensionless axial gap width is not sufficiently investigated. It is also quite important to convert the 2D Daily and Nece diagram into 3D by introducing the through-flow coefficient. In order to investigate the impact of the centripetal through-flow, a test rig is designed and built up at the University of Duisburg-Essen. The design of the test rig is described. The impact of the above mentioned parameters on the velocity profile, pressure distribution, axial thrust and frictional torque are presented and analyzed in this paper. The 3D Daily and Nece diagram introducing the through-flow coefficient is also organized in this paper.

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“…Radial clearance sizes, usually referring to wear ring sizes, were studied in a centrifugal pump by Liu et al [20] and they found that the velocity and pressure distribution in the front wear ring was related to its radial dimension. Many scholars [21][22][23][24] also experimentally and theoretically discovered that changing the distance between a rotating wall and a stationary wall would make the flow structure between the two walls show different characters. However, little research has been done to analyze the influence of axial clearance sizes on the unsteady flow characteristics in centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Pressure Fluctuation Characteristics in a Centrifugal Pump with Variable Axial Clearance

Cao

Wang

Xiao

et al. 2016

International Journal of Rotating Machinery

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Clearance flows in the sidewall gaps of centrifugal pumps are unsteady as well as main flows in the volute casing and impeller, which may cause vibration and noise, and the corresponding pressure fluctuations are related to the axial clearance size. In this paper, unsteady numerical simulations were conducted to predict the unsteady flows within the entire flow passage of a centrifugal pump operating in the design condition. Pressure fluctuation characteristics in the volute casing, impeller, and sidewall gaps were investigated with three axial clearance sizes. Results show that an axial clearance variation affects the pressure fluctuation characteristics in each flow domain by different degree. The greatest pressure fluctuation occurs at the blade pressure surface and is almost not influenced by the axial clearance variation which has a certainly effect on the pressure fluctuation characteristics around the tongue. The maximum pressure fluctuation amplitude in the sidewall gaps is larger than that in the volute casing, and different spectrum characteristics show up in the three models due to the interaction between the clearance flow and the main flow as well as the rotor-stator interaction. Therefore, clearance flow should be taken into consideration in the hydraulic design of centrifugal pumps.

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Investigation of the flow in the impeller side clearances of a centrifugal pump with volute casing

Cited by 37 publications

References 8 publications

Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine

Investigation on Thrust and Moment Coefficients of a Centrifugal Turbomachine

Investigation on the Flow in a Rotor-Stator Cavity with Centripetal Through-Flow

Numerical Investigation of Pressure Fluctuation Characteristics in a Centrifugal Pump with Variable Axial Clearance

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