Numerical Simulation of Low Specific Speed American Petroleum Institute Pumps in Part-Load Operation and Comparison With Test Rig Results

Benigni, Helmut; Jaberg, Helmut; Yeung, Hoi; Salisbury, Tony; Berry, Owen; Collins, T.

doi:10.1115/1.4005769

Cited by 32 publications

(15 citation statements)

References 21 publications

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“…For 0.25Q n , their CFD results predicted different types of back flows in the impeller region, including steady leading edge separations, rotating vortex in the impeller wake region, and back flow on the impeller pressure side. Many other researchers presented identical flow patterns for off-design conditions using CFD, LDV and PIV methods and revealed the main portion of the recirculation zones and separated flows on energy wasting of the absorbed power for undesired flow pattern [9][10][11][12][13][14]. Recently, hydrodynamic instabilities and cavitating patterns of the fluid flow below design point have been discussed employing vibration analysis and pressure fluctuation measurements [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of temperature rise in centrifugal pumps at partial flow rates

Sojoudi

Nourbakhsh

Shokouhmand

2018

J Braz. Soc. Mech. Sci. Eng.

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When the centrifugal pumps operate near shut-off condition, different kinds of energy losses happen from inlet to discharge nozzle leading to lower hydraulic performance and overall efficiency. A part of dissipated energy turns into heat and increases the operating liquid temperature. This may seem to be very dangerous when talking about pumping oil or any other flammable chemical liquids. In the present investigation, several centrifugal pumps were selected to perform experimental analysis of measuring temperature rise at inlet and discharge nozzles during part load operation. Pumps were entirely insulated using glass wool to prevent heat leakage from pump casing to the environment and pure water was selected to play as the working fluid. Temperature rise of pumps was reported from start time up to assuaging steady-state condition. Obtained results demonstrated that higher rotational speed of impeller led to higher value of outlet water temperature in a shorter time rather than lower rotational speeds. Steady-state temperature values were used to establish a novel relation for temperature rise that can be implemented for wide range of centrifugal pumps. Keywords Experimental evaluation Á Centrifugal pump Á Off-design condition Á Temperature rise Abbreviations AH Absorbed heat by working fluid (W) C P Specific heat (J/kg K) D 2 Diameter (m) g Gravity (m/s 2) H Pump outlet head (m) LR Loss rate (W) n Rotational speed (rpm) _ m Mass flow rate (kg/s) P Useful power (W) Q Volumetric flow rate (m 3 /s) Q * Dimensionless flow rate (-) Q n Nominal volumetric flow rate (m 3 /s) DT Temperature rise (K) DT max Maximum temperature rise (K) Greek symbols c Specific weigh (kg/m 2 s 2) g Overall efficiency p Dimensionless number (-) l Dynamic viscosity (Pa s) q Density (kg/m 3

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Section: Introductionmentioning

confidence: 99%

Experimental evaluation of temperature rise in centrifugal pumps at partial flow rates

Sojoudi

Nourbakhsh

Shokouhmand

2018

J Braz. Soc. Mech. Sci. Eng.

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“…P. Gaetani et al [10] researched the flow field in the vaned diffuser of a centrifugal pump at different vane setting angles. Helmut Benigni [11] adopted experimental and numerical methods to research the clocking effect on the performance in centrifugal pump. However, they defined the clocking effect as the relative circumferential position between the impeller blade and the volute tongue, which is essentially a kind of rotor-stator interaction.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser

Jiang

Liu

et al. 2016

International Communications in Heat and Mass Transfer

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“…Many scholars have studied the fluid flow characteristics in the cavity, but none of their studies have provided detailed distribution characteristics of fluid flow in the cavity with different angles and radii. In (Benigni et al 2012), the numerical simulations are used to predict the performance of centrifugal pumps and found that fluid flow characteristics in the cavity strongly influenced the accuracy and precision of the results. The acting force of the back shroud was an essential component of the axial force of the centrifugal pump (Guan 2011, Dong et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump

Dong

Chu

2018

JAFM

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A detailed analysis on the fluid flow distribution in the back shroud cavity is significant for accurately calculating axial forces in the operation of centrifugal pumps. The numerical calculation results and the experimental results were basically consistent on the performance of the centrifugal pump and the fluid flow characteristics in the back shroud cavity. Distribution of velocity field was researched in the back shroud cavity. We plot the axial distribution curves of the dimensionless circumferential and radial components of velocity of the fluid inside the cavity with different angles and radii. We then analyze the fluid pressure distribution in the back shroud cavity and compare it with experimental results. Results show that the fluid flow in the back shroud cavity involves the core area and the fluid leakage. Results also show that the fluid in the core area behaves like a revolving rigid body. At the operating points of the same flow rate, the cross-sectional area of the volute directly affects the flow rate of the fluid in the back shroud cavity, significantly restricting the fluid flow in that component. However, the flow pattern in the turbulent boundary layer is strongly affected by the leakage flow; hence, the distribution of velocity is not axially symmetric. When the flow rate increases from 0.8 Qsp to 1.2 Qsp, the radial differential pressure between the sealing ring and the volute decreases. Meanwhile, the disc friction loss of the impeller-to-wall inside the back shroud cavity tends to be more circumferentially or radially equal, whereas the radial leakage rate in the back shroud cavity tends to decrease. The fluid flow in the back shroud cavity comprises the circumferential shear flow and radial differential pressure flow and is considered as a 2D viscous laminar flow.

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Numerical Simulation of Low Specific Speed American Petroleum Institute Pumps in Part-Load Operation and Comparison With Test Rig Results

Cited by 32 publications

References 21 publications

Experimental evaluation of temperature rise in centrifugal pumps at partial flow rates

Experimental evaluation of temperature rise in centrifugal pumps at partial flow rates

Numerical investigation of influence of the clocking effect on the unsteady pressure fluctuations and radial forces in the centrifugal pump with vaned diffuser

Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump

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