Experimental investigation and performance prediction modeling of a single stage centrifugal pump operating as turbine

Stefanizzi, Michele; Torresi, Marco; Fortunato, Bernardo; Camporeale, Sergio Mario

doi:10.1016/j.egypro.2017.08.218

Cited by 56 publications

(39 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 of 18 n ED = n·D g·H (4) T ED = T D 3 ·ρ·g·H (5) A principle representation of 4Q behavior of a semi-axial pump is shown in Figure 1 where different operation modes of a pump are marked. The sign convention in the IEC 60193 standard for rotation and flow rate is specified with positive signs for turbine operation.…”

Section: The 4-quadrant Behavior Of a Pump And Its Representationmentioning

confidence: 99%

“…Several methods for predicting the behavior of pumps as turbines are presented but the authors state that none of the presented methods is appropriate for the entire range of specific speeds. Stefanizzi et al [5] investigated the performance prediction of a pump operating as turbine. They proposed a new model for predicting the turbine mode performance of a pump.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps

Höller

Benigni

Jaberg

2019

IJTPP

View full text Add to dashboard Cite

Besides operating a centrifugal pump under normal conditions there are additional operating conditions possible; for example, a pump operated as turbine. Another example would be a pump trip where there are several abnormal operating conditions possible when the direction of flow and/or the direction of rotation are changing. The machine behavior in every possible operation condition can be represented by the complete pump characteristics, often called the 4-quadrant (4Q) behavior of a centrifugal pump. To gather the 4Q behavior, a test rig allowing the flow direction as well as the rotation direction to be reverted is necessary, with time-consuming measurements at variable positive and negative discharge in both directions of rotation the complete pump characteristics are evaluated. In the present study, an approach to investigate the complete pump characteristics by means of computational fluid dynamics (CFD) calculations is presented. With steady-state calculations and additional transient CFD investigations in the normal operating conditions, the whole pump characteristics were calculated accurately. Two different types of mixed flow diffuser pumps were investigated-one equipped with adjustable impeller blades, the second one with comparable low specific speed. Experimental verifications have shown a remarkably good agreement. Furthermore, an exemplary numerical waterhammer analysis shows the successful application of the presented approach.Keywords: mixed flow pump; computational fluid dynamics; 4-quadrant behavior; comparison of measurement and simulation; model test; waterhammer Int.

show abstract

Section: The 4-quadrant Behavior Of a Pump And Its Representationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps

Höller

Benigni

Jaberg

2019

IJTPP

View full text Add to dashboard Cite

show abstract

“…Numerical simulations at different flow rates are suggested for the purpose of further exploring the slip factor behavior. Eventually, three different slip factor models have been applied to the 1D model proposed by Stefanizzi et al [15] to predict the PaT performance, see Figure 8. The results show that by neglecting the slip factor (σturbine = 1) [2,7] the turbine head at the BEP is overestimated with an error of +6.4%.…”

Section: (7)mentioning

confidence: 99%

How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon

et al. 2018

View full text Add to dashboard Cite

Nowadays Pumps working as Turbines (PaT) are devices widely used to perform energy recovery in hydraulic grids, thus improving their overall efficiency, and to build small hydropower plants. In this work, a centrifugal pump has been numerically investigated in turbine operating mode by means of the open-source CFD code OpenFOAM with emphasis on the flow field at the runner outlet. Due to the reduced number of blades in a PaT, the mean outlet relative velocity angle differs from the blade angle. In order to account for this phenomenon, the slip factor is introduced. The slip factor is investigated and its application to a 1D model is shown in order to highlight the improvement in predicting the characteristic curve of a centrifugal pump used in reverse mode as a turbine (PaT) especially at its part-load.

show abstract

“…Table 1 summarizes some of suggested models to predict PAT performance: flow ratio (q) and head ratio (h). Expressions have been subdivided in chronological order and grouped into two classes, the first based on the BEP parameters [18][19][20][21][22][23][24][25][26][27] and the second based on the specific speed number (N s ) [13,[28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…In order to guarantee a more general applicability of the prediction model for PAT performance, the analysis is supported by an input literature database [6,13,16,30,31,33,[38][39][40] consisting of pumps operating in a range of specific speeds from 9 to 80 (rpm) and characterized by several impeller sizes.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction of a Pump as Turbine: Sensitivity Analysis Based on Artificial Neural Networks and Evolutionary Polynomial Regression

Balacco

2018

Energies

View full text Add to dashboard Cite

The research of a general methodology to predict the pump performance in a reverse mode, knowing those of a pump in a direct mode, is a question that is still open. The scientific research is making many efforts toward answering this question, but at present, there is still not much clarity. This consideration has been the starting point of this research that thanks to artificial neural networks and evolutionary polynomial regression methods have tried to investigate and define the real weight of every input parameter, representing the efficiency of a pump in a direct way, on the output parameters, and representing efficiency of a pump used like a turbine.

show abstract

Experimental investigation and performance prediction modeling of a single stage centrifugal pump operating as turbine

Cited by 56 publications

References 14 publications

Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps

Numerical and Experimental Investigation of the 4-Quadrant Behavior of Different Mixed Flow Diffuser Pumps

How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon

Performance Prediction of a Pump as Turbine: Sensitivity Analysis Based on Artificial Neural Networks and Evolutionary Polynomial Regression

Contact Info

Product

Resources

About