An experimental investigation of pump as turbine for micro hydro application

Raman, Nathan; Hussein, Ibrahim; Palanisamy, K.; Foo, B.

doi:10.1088/1755-1315/16/1/012064

Cited by 21 publications

(16 citation statements)

References 2 publications

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“…The result showed that a centrifugal pump can satisfactorily be operated as a turbine without any mechanical problems. The best efficiency RESD © 2019 http://apc.aast.edu point (BEP) for PAT was found to be lower than BEP in pump mode [39].…”

Section: Head Numbermentioning

confidence: 93%

Comprehensive Review of Pump as Turbine

Jemal

Haile

2019

Ren. Ener. & Sust. Dev.

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The turbine is a heart of power generation in a hydroelectric power system. A variety of different turbines are available for that purpose. The common types of Hydraulic turbines are; Pelton, cross flow, Francis, Kaplan, and propeller turbine. However, using conventional turbines for low head and flow rate (i.e. micro hydropower) applications are not economically feasible. A low-cost alternative is to use the pump as a turbine. In this paper, existing Peer-reviewed articles from (Scopus, google scholar, umbrella, etc.) that are directly related to pump running as a turbine are collected and reviewed. Theoretical, numerical, and experimental investigations are considered. Performance improvement techniques for PAT are summarized and research gaps in related works are identified.

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Section: Head Numbermentioning

confidence: 93%

Comprehensive Review of Pump as Turbine

Jemal

Haile

2019

Ren. Ener. & Sust. Dev.

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“…Generally, a centrifugal pump is designed to use electrical energy to deliver water flow, but in a PAT power plant, the water flows rotate the impeller and rotor shaft to generate electrical energy. Although the commercial pump is not designed to convert the potential energy of water into electrical energy, however, several research articles have revealed that a commercial pump available in the market can be used as a turbine and generate electricity [1][2][3][4][5]. PAT has many advantages such as low cost, less complexity, mass production, availability for a wide range of heads and flows, short delivery time, available in a large number of standard sizes, ease of availability of a spare part, easy installation, etc.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface roughness of the impeller to the performance of pump as turbine pico power plant

Zariatin

Rahmalina

Prasetyo

et al. 2019

JMES

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Pump as Turbine (PAT) is one of a hydropower plant that applies a pump with a reversed flow, working as a turbine to generate electrical power. It has the advantages of low-cost, widely available in the market and user-friendly. However, like other hydropower plants, PAT technology has low performance in term of power output. The impeller surface roughness is one of critical aspect, which influences PAT performance because poor surface roughness causes losses and cavitation. The objective of the research is to increase the PAT performance by improving the quality of the surface roughness and validate by the experimental tests. A low-cost and customize hand grinding process was applied to produce five impellers with three different levels of surface roughness (average surface roughness of 0.16 mm, 0.24 mm, and 0.40 mm), an edge rounded impeller, and a varnish lacquer coated impeller. All of the impellers undergo performance testing. The performance of the original impeller (without modification) used as a comparison. The experiment result shows that an impeller with a lower surface roughness (lower Ra number) has a higher performance. An impeller with an average surface roughness of 0.16 mm improved 10.9% of its initial performance. Additional edge rounding for a 0.16 mm surface roughness impeller would improve its performance by 13.1%. The optimum turbine efficiency of 15.45% was achieve-able by implementing an impeller with the lowest surface roughness.

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“…A centrifugal pump can be used as a turbine to generate electrical power in the dam across a river by using water potential or to drive a machine by making use of the residual liquid pressurized in a chemical or petro-chemical process and other kinds of process plants. Over the years, much efforts have been devoted to this sort of machine to investigate its noncavitation hydraulic performance with analytical methods [1][2][3][4][5][6][7] and experiment, [8][9][10][11][12][13][14][15][16][17][18] noncavitation fluid dynamics, 9,[19][20][21][22][23][24][25] and geometrical effects of the hydraulic components on noncavitation performance, 21,[26][27][28] radial thrust behavior, 29 and unsteady flow features 30 under noncavitation condition.…”

Section: Introductionmentioning

confidence: 99%

Computational cavitating viscous liquid flows in a pump as turbine and Reynolds number effects

Zhang

2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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Cavitating flows of viscous oils in an experimental centrifugal pump with low specific speed are modeled and simulated by using the time-averaged Navier–Stokes equations and standard [Formula: see text] turbulence model as well as full cavitation model based on the computational fluid dynamics method, when the pump operates in the reverse direction as turbine to generate power. The cavitation characteristics are identified at part-load, best efficiency and over-load points and five viscosities. Effects of viscosity on net positive suction head required are clarified. Net positive suction head required correction factor and conversion factor curves are obtained and correlated to impeller Reynolds number. The flow and cavitation models are validated with the existing experimental results and empirical correlations. Pressure and helix angle profiles at the draft tube entrance, cavity shape, swirling flow pattern in the draft tube, and the pressure coefficient distribution over the blade surfaces are presented. The presented results can be useful for design, selection, performance prediction, and impeller redesign of a pump as turbine.

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An experimental investigation of pump as turbine for micro hydro application

Cited by 21 publications

References 2 publications

Comprehensive Review of Pump as Turbine

Comprehensive Review of Pump as Turbine

The effect of surface roughness of the impeller to the performance of pump as turbine pico power plant

Computational cavitating viscous liquid flows in a pump as turbine and Reynolds number effects

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