Unveiling the startup characteristics of pump as turbine using computational and experimental techniques
Over time, the interest in using pumps as turbines (PATs) instead of conventional turbines has increased. The nature and operation challenges of hydraulic resources necessitate frequent starts and stops, resulting in severe fluctuations caused by fluid flow that led to machine deterioration. Gaining...
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Elsevier
2025-03-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S259012302500043X |
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| author | Dessie Tarekegn Bantelay Girma Gebresenbet Bimrew Tamrat Admasu Muluken Temesgen Tigabu Muluken Zegey Getie |
| author_facet | Dessie Tarekegn Bantelay Girma Gebresenbet Bimrew Tamrat Admasu Muluken Temesgen Tigabu Muluken Zegey Getie |
| author_sort | Dessie Tarekegn Bantelay |
| collection | DOAJ |
| description | Over time, the interest in using pumps as turbines (PATs) instead of conventional turbines has increased. The nature and operation challenges of hydraulic resources necessitate frequent starts and stops, resulting in severe fluctuations caused by fluid flow that led to machine deterioration. Gaining more insight into how the flow develops during transients allows for safe operating conditions, effective production planning, and estimating the cost variation due to operational changes. Currently, there are limited studies on the properties of pumps that function as turbines (PATs) at startup. This work analyzes the PAT's transient behavior over time while the system is starting up. A test rig was constructed for the centrifugal PAT to reveal its transient characteristics during the start-up process. In addition to the experiments, flow-dynamic simulations were run using ANSYS-Fluent. The rotating part's angular velocity was validated against experimental data. Transient characteristics such as the flow rate, head, torque, and tangential force of the PAT, etc., as well as the internal flow during the start-up, were analyzed. During the start-up transient phase, the transient characteristic parameters such as pump rotational speed, head, and flow rate change significantly. As the rotating speed approaches the rated speed, there is an increase in the transient impact head to a peak that is 2.04 times that of the rated head. The numerical simulation's outcomes and the experimental data were in excellent agreement. |
| format | Article |
| id | doaj-art-07029fa166504e85a3c2686db16784c9 |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-07029fa166504e85a3c2686db16784c92025-01-12T05:25:39ZengElsevierResults in Engineering2590-12302025-03-0125103955Unveiling the startup characteristics of pump as turbine using computational and experimental techniquesDessie Tarekegn Bantelay0Girma Gebresenbet1Bimrew Tamrat Admasu2Muluken Temesgen Tigabu3Muluken Zegey Getie4Faculty of Mechanical & Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O.Box 26, Ethiopia; Corresponding author.Faculty of Mechanical & Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O.Box 26, Ethiopia; Department of Energy and Technology, Swedish University of Agric Sciences, SLU, Box 7032, Uppsala 750 07, SwedenFaculty of Mechanical & Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O.Box 26, EthiopiaFaculty of Mechanical & Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O.Box 26, EthiopiaFaculty of Mechanical & Industrial Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O.Box 26, EthiopiaOver time, the interest in using pumps as turbines (PATs) instead of conventional turbines has increased. The nature and operation challenges of hydraulic resources necessitate frequent starts and stops, resulting in severe fluctuations caused by fluid flow that led to machine deterioration. Gaining more insight into how the flow develops during transients allows for safe operating conditions, effective production planning, and estimating the cost variation due to operational changes. Currently, there are limited studies on the properties of pumps that function as turbines (PATs) at startup. This work analyzes the PAT's transient behavior over time while the system is starting up. A test rig was constructed for the centrifugal PAT to reveal its transient characteristics during the start-up process. In addition to the experiments, flow-dynamic simulations were run using ANSYS-Fluent. The rotating part's angular velocity was validated against experimental data. Transient characteristics such as the flow rate, head, torque, and tangential force of the PAT, etc., as well as the internal flow during the start-up, were analyzed. During the start-up transient phase, the transient characteristic parameters such as pump rotational speed, head, and flow rate change significantly. As the rotating speed approaches the rated speed, there is an increase in the transient impact head to a peak that is 2.04 times that of the rated head. The numerical simulation's outcomes and the experimental data were in excellent agreement.http://www.sciencedirect.com/science/article/pii/S259012302500043XStartup characteristicsTransient characteristicsPumps as turbinesComputational fluid dynamics (CFD)Unsteady flow |
| spellingShingle | Dessie Tarekegn Bantelay Girma Gebresenbet Bimrew Tamrat Admasu Muluken Temesgen Tigabu Muluken Zegey Getie Unveiling the startup characteristics of pump as turbine using computational and experimental techniques Results in Engineering Startup characteristics Transient characteristics Pumps as turbines Computational fluid dynamics (CFD) Unsteady flow |
| title | Unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| title_full | Unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| title_fullStr | Unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| title_full_unstemmed | Unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| title_short | Unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| title_sort | unveiling the startup characteristics of pump as turbine using computational and experimental techniques |
| topic | Startup characteristics Transient characteristics Pumps as turbines Computational fluid dynamics (CFD) Unsteady flow |
| url | http://www.sciencedirect.com/science/article/pii/S259012302500043X |
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