scholarly journals Theoretical, Numerical and Experimental Research of Single Stage, Radial Discharge Centrifugal Pump Operating in Turbine Mode

2019 ◽  
Vol 8 (12) ◽  
pp. 1265-1270
Keyword(s):  
Centrifugal Pump ◽  
Experimental Research ◽  
Performance Prediction ◽  
Experimental Analysis ◽  
Numerical Results ◽  
Pump Mode ◽  
Characteristic Curves ◽  
Reverse Mode ◽  
Specific Speed ◽  
Turbine Mode

In this study, the best efficiency point of end suction, radial discharge, centrifugal pump operated in turbine mode was arrived applying numerical and experimental analysis. The pump was simulated both in direct and turbine modes using Star CCM+ CFD software. Characteristic curves were developed for the pump in direct and turbine modes. A monoblock centrifugal pump of specific speed 35.89 (m, m3 /s) was used for this study. The pump was tested experimentally in turbine and pump mode .The theoretical and numerical results were verified by those obtained through experimentation. Some of the correlations proposed by earlier researchers for performance prediction of pump in reverse mode were also tested

Performance Analysis of Centrifugal Pump at Different Operating Mode

2018 ◽  
Vol 4 (11) ◽  
pp. 8
Author(s):  
Bhanwar Lal ◽  
Dr. T. S. Deshmukh
Keyword(s):  
Numerical Simulation ◽  
Performance Analysis ◽  
Centrifugal Pump ◽  
Operating Mode ◽  
Operating Conditions ◽  
Maximum Efficiency ◽  
Pump Mode ◽  
Design Discharge ◽  
Rate Of Increase ◽  
Turbine Mode

The   aim of this research is to perform numerical simulation of centrifugal pump and PATs mode to analyse its cavitation characteristics and NPSHr at different operating conditions. It was found that maximum efficiency at design discharge for the PAT is about 2 % less than the efficiency in pump mode. It is observed that the efficiencies increase steadily on increasing the discharge from 8.88 kg/s to 14.8 kg/s. in both pump and turbine mode. Thereafter the rate of increase in efficiency becomes very less when increase in discharge to 17.76 kg/s.  Maximum efficiency of 59.49 % being achieved at 14.8 kg/s.

scholarly journals End Suction Centrifugal Pump Operating in Turbine Mode for Microhydro Applications

2014 ◽  
Vol 6 ◽  
pp. 139868 ◽  
Author(s):  
Mohd Azlan Ismail ◽  
Al Khalid Othman ◽  
Shahidul Islam ◽  
Hushairi Zen
Keyword(s):  
Centrifugal Pump ◽  
Third World ◽  
Low Cost ◽  
Induction Generator ◽  
Efficiency Improvement ◽  
Output Terminal ◽  
Electric Control ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Turbine Mode

This paper reviews the current research works on the end suction centrifugal pump coupled with induction generator running in turbine mode for microhydro application. The information can be used by practicing engineers, researchers, and plant managers to understand the potential of pump running as turbine. Review on experimental and simulation works was carried out encompassing end suction single stage low specific speed which is less than 10 kW. This is followed by review of their efficiency improvement through modifications. The results show that centrifugal pump can operate in turbine modes without any modification on mechanical components. However, to achieve the best efficiency point (BEP), it requires higher flow rate and head than pumping rating. Efficiency improvement is viable through geometric modification to improve hydraulic characteristic. The studies also show that pump as turbine (PAT) can be directly coupled with modified induction motor as generator by adding capacitor and electric control system, regulating voltage and frequency at the output terminal. It was found that PAT offers the best low cost solution for microhydro application especially for third world countries that do not have local microhydro manufacturer.

Numerical simulation of cavitating flow in a centrifugal pump as turbine

2016 ◽  
Vol 232 (2) ◽  
pp. 135-154 ◽  
Author(s):  
Wenguang Li ◽  
Yuliang Zhang
Keyword(s):  
Centrifugal Pump ◽  
Flow Rate ◽  
Pressure Coefficient ◽  
Cavitating Flow ◽  
Pump Mode ◽  
Flow Models ◽  
Rate Dependent ◽  
Cavitation Performance ◽  
Critical Cavitation ◽  
Turbine Mode

In this study, the cavitating flow and cavitation performance are studied by employing the computational fluid dynamics method in the turbine mode of a centrifugal pump at part-load, best efficiency, and over-load points. The flow models are validated in the pump mode under noncavitation condition. The relationships between the performance variables and net positive suction head available are obtained, and the corresponding net positive suction heads required are extracted. The flow patterns, location, and shape of the cavity are illustrated; the pressure coefficient profiles on the blade surfaces are clarified and compared with those in the pump mode under both noncavitation and critical cavitation conditions. The cavitation performance and flow pattern as well as cavity shape in the turbine mode are distinguishably different from the pump mode. It is found out that the cavitation behavior in the turbine mode exhibits three notable features: a lower and less flow rate-dependent net positive suction head required, a flow rate-dependent suppressed rotational flow in the draft tube, as well as a rotational and extendable cavitating rope originated from the impeller cone. The results and methods can be important and useful for the design and selection of a centrifugal pump as turbine.

scholarly journals Turbine Mode Performance Evaluation of Centrifugal Pump

2019 ◽  
Vol 9 (1) ◽  
pp. 6804-6809
Keyword(s):  
Performance Evaluation ◽  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Simulation Software ◽  
Centrifugal Pumps ◽  
Pump Mode ◽  
Mode Operation ◽  
Performance Curves ◽  
The Difference ◽  
Turbine Mode

This paper presents the performance evaluation results of a radial discharge centrifugal pump obtained through experimentation and CFD simulation. The paper also presents a brief theory behind the difference in the performance of a centrifugal pump operated in pump mode and turbine mode. The pump CFD simulation is performed with Star CCM+ simulation software. The pumps studied are both mono block radial discharge centrifugal pumps with rated speed of rotation per minute as 1400 and 2800 and specific speeds 20.65 (m,m3 /s) and 35.89 (m,m3 /s) respectively. The CFD results were first validated for pump mode by comparing them with the manufacturer provided performance curves. The results of CFD simulation for turbine mode operation are then compared with experimentally obtained results. The paper also presents a brief theory about PAT concept.

scholarly journals Analysis of Performance Characteristics Predicted From Several Experimental Data and Conversion Methods for Pumps as Turbine Application Using Statistical Techniques

2020 ◽  
Vol 39 (2) ◽  
pp. 213-226
Author(s):  
Ombeni Mdee ◽  
Cuthbert Kimambo ◽  
Torbjorn Nielsen ◽  
Joseph Kihedu
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Performance Characteristics ◽  
Hydropower Plant ◽  
Rate Coefficients ◽  
Reverse Direction ◽  
Centrifugal Pumps ◽  
Pump Mode ◽  
Reverse Mode ◽  
Specific Speed

Different performance characteristics have been indicated when running centrifugal pumps in the reverse direction. The water flows from the discharge side of the pump to the suction side to run in the reverse direction and generate the mechanical rotational energy for the micro-hydropower plant. The current study evaluates the extent of variation of performance characteristics predicted by several experimental data from different pump-specific speeds and conversion methods. The performance characteristics discussed include the head, flow rate, efficiency and specific speed. The flow rate and head of a pump operating in pump mode divided with the characteristic of the pump operating in the reverse mode, at the best efficiency point, the resulting coefficient of determination (R 2 ) values were of 0.890 and 0.708, respectively. Also, the graph of head versus flow rate coefficients, which is a second- order polynomial function, has shown the value of R 2 of 0.954 for pump-specific speed ranging between 9 and 94 rpm. However, the pump in the reverse mode has smaller performance characteristics for efficiency and specific speed compared to the pump mode operation with R 2 of 0.966 and 0.999, respectively. Furthermore, schematic empirical statistical models were developed to predict the performance characteristics of several conversion methods using pump data obtained from the manufacturers.

Theoretical and Numerical Study of Performance Prediction of Centrifugal Pumps as Turbines

2013 ◽  
Vol 444-445 ◽  
pp. 579-587
Author(s):  
Xiao Hui Wang ◽  
Jun Hu Yang ◽  
Feng Xia Shi ◽  
Ren Hui Zhang
Keyword(s):  
Flow Rate ◽  
Performance Prediction ◽  
Numerical Study ◽  
Theoretical Method ◽  
Attractive Alternative ◽  
Centrifugal Pumps ◽  
Pump Mode ◽  
External Characteristic ◽  
Specific Speed ◽  
Theoretical Results

Pumps as turbines (PAT) is an attractive alternative for recovering the pressure-energy. Establishing an external characteristic correlation between pumps and turbines is essential in selecting the proper machine. In this study, a theoretical method was presented to predict the performance of PAT at best efficiency point based on pump’s characteristics (geometric and hydraulic). In order to verify the theoretical results, the pumps with specific speed 55, 86,128,180,200 were simulated in direct and reverse modes by FLUENT12.0. Using theoretical and numerical results, the characteristic correlation curves of pumps in direct and reverse modes were obtained. Deviations of theoretical results s in higher flow rate and head than pump mode, the best efficiency of PAT was 2%~6% lower than pump mode.

scholarly journals A Performance Prediction Model for Pumps as Turbines (PATs)

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1175 ◽  
Author(s):  
Stefania Fontanella ◽  
Oreste Fecarotta ◽  
Bruno Molino ◽  
Luca Cozzolino ◽  
Renata Della Morte
Keyword(s):  
Low Cost ◽  
Electrical Energy ◽  
Pump Mode ◽  
Technical Literature ◽  
Characteristic Curves ◽  
Mode Characteristic ◽  
Mode Characteristics ◽  
Turbine Mode ◽  
Selection Phase ◽  
A Performance

In recent years, the interest towards the use of pumps operating as turbines (PATs) for the generation of electrical energy has increased, due to the low cost of implementation and maintenance. The main issue that inhibits a wider use of PATs is the lack of corresponding characteristic curves, because manufacturers usually provide only the pump-mode performance characteristics. In the PAT selection phase, the lack of turbine-mode characteristic curves forces users to expend expensive and time-consuming efforts in laboratory testing. In the technical literature, numerous methods are available for the prediction of PAT turbine-mode performance based on the pump-mode characteristics, but these models are usually calibrated making use of few devices. To overcome this limit, a performance database called Redawn is presented and the data collected are used to calibrate novel PAT performance models.

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