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CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems

A Pump as Turbine (PAT) is one of micro hydro system components that is used to substitute a commercially available turbine due to its wide availability and low acquisition cost. However, PAT have high hydraulic losses due to differences in pumpturbine operation and hydraulic design. The fluid flowi...

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Main Authors: Al-Khalid, Hj Othman, Hushairi, Zen, Mohd Azlan, Ismail
Format: Article
Language:English
Published: EDP Sciences 2017
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://ir.unimas.my/id/eprint/31175/1/Al-Khalid%20Hj%20Othman.pdf
http://ir.unimas.my/id/eprint/31175/
https://www.matec-conferences.org/articles/matecconf/abs/2017/01/matecconf_encon2017_05004/matecconf_encon2017_05004.html
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spelling my.unimas.ir.311752021-06-21T14:12:15Z http://ir.unimas.my/id/eprint/31175/ CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems Al-Khalid, Hj Othman Hushairi, Zen Mohd Azlan, Ismail TK Electrical engineering. Electronics Nuclear engineering A Pump as Turbine (PAT) is one of micro hydro system components that is used to substitute a commercially available turbine due to its wide availability and low acquisition cost. However, PAT have high hydraulic losses due to differences in pumpturbine operation and hydraulic design. The fluid flowing inside the PAT is subjected to hydraulic losses due to the longer flow passage and unmatched fluid flow within the wall boundaries. This paper presents the effect of rounding the impeller leading edges of the pump on turbine performance. A CFD model of a PAT was designed to simulate virtual performance for the analysis. The aim of this study is to observe the internal hydraulic performance resulting from the changes in the performance characteristics. Highest efficiency was recorded at 17.0 l/s, an increase of 0.18%. The simulation results reveal that there is an improvement in hydraulic performance at overflow operation. The velocity vector visualization shows that there is a reduction in wake and consequently less flow separation along impeller flow passages. However, adjusting the sensitive impeller inlet geometry will also alter the velocity inlet vector and consequently change the velocity triangles for the turbo machinery system. EDP Sciences 2017 Article PeerReviewed text en http://ir.unimas.my/id/eprint/31175/1/Al-Khalid%20Hj%20Othman.pdf Al-Khalid, Hj Othman and Hushairi, Zen and Mohd Azlan, Ismail (2017) CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems. MATEC Web of Conferences, 87 (05004). pp. 1-5. ISSN 2261-236X https://www.matec-conferences.org/articles/matecconf/abs/2017/01/matecconf_encon2017_05004/matecconf_encon2017_05004.html DOI:org/10.1051/matecconf/20178705004
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Al-Khalid, Hj Othman
Hushairi, Zen
Mohd Azlan, Ismail
CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
description A Pump as Turbine (PAT) is one of micro hydro system components that is used to substitute a commercially available turbine due to its wide availability and low acquisition cost. However, PAT have high hydraulic losses due to differences in pumpturbine operation and hydraulic design. The fluid flowing inside the PAT is subjected to hydraulic losses due to the longer flow passage and unmatched fluid flow within the wall boundaries. This paper presents the effect of rounding the impeller leading edges of the pump on turbine performance. A CFD model of a PAT was designed to simulate virtual performance for the analysis. The aim of this study is to observe the internal hydraulic performance resulting from the changes in the performance characteristics. Highest efficiency was recorded at 17.0 l/s, an increase of 0.18%. The simulation results reveal that there is an improvement in hydraulic performance at overflow operation. The velocity vector visualization shows that there is a reduction in wake and consequently less flow separation along impeller flow passages. However, adjusting the sensitive impeller inlet geometry will also alter the velocity inlet vector and consequently change the velocity triangles for the turbo machinery system.
format Article
author Al-Khalid, Hj Othman
Hushairi, Zen
Mohd Azlan, Ismail
author_facet Al-Khalid, Hj Othman
Hushairi, Zen
Mohd Azlan, Ismail
author_sort Al-Khalid, Hj Othman
title CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
title_short CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
title_full CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
title_fullStr CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
title_full_unstemmed CFD Modelling of a Pump as Turbine (PAT) with Rounded Leading Edge Impellers for Micro Hydro Systems
title_sort cfd modelling of a pump as turbine (pat) with rounded leading edge impellers for micro hydro systems
publisher EDP Sciences
publishDate 2017
url http://ir.unimas.my/id/eprint/31175/1/Al-Khalid%20Hj%20Othman.pdf
http://ir.unimas.my/id/eprint/31175/
https://www.matec-conferences.org/articles/matecconf/abs/2017/01/matecconf_encon2017_05004/matecconf_encon2017_05004.html
_version_ 1703964075222892544
score 13.211869

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