Version 1
: Received: 24 April 2023 / Approved: 25 April 2023 / Online: 25 April 2023 (03:47:35 CEST)
How to cite:
Bentum-Micah, G.; Agyapong Atuahene, S.; Cai, L.; Adu, D.; Sheng, Q.X. Effects of Rotational Speed on Performance Prediction of Pump As Turbine For energy generation and Green Development. Preprints2023, 2023040874. https://doi.org/10.20944/preprints202304.0874.v1
Bentum-Micah, G.; Agyapong Atuahene, S.; Cai, L.; Adu, D.; Sheng, Q.X. Effects of Rotational Speed on Performance Prediction of Pump As Turbine For energy generation and Green Development. Preprints 2023, 2023040874. https://doi.org/10.20944/preprints202304.0874.v1
Bentum-Micah, G.; Agyapong Atuahene, S.; Cai, L.; Adu, D.; Sheng, Q.X. Effects of Rotational Speed on Performance Prediction of Pump As Turbine For energy generation and Green Development. Preprints2023, 2023040874. https://doi.org/10.20944/preprints202304.0874.v1
APA Style
Bentum-Micah, G., Agyapong Atuahene, S., Cai, L., Adu, D., & Sheng, Q.X. (2023). Effects of Rotational Speed on Performance Prediction of Pump As Turbine For energy generation and Green Development. Preprints. https://doi.org/10.20944/preprints202304.0874.v1
Chicago/Turabian Style
Bentum-Micah, G., Daniel Adu and Qian Xu Sheng. 2023 "Effects of Rotational Speed on Performance Prediction of Pump As Turbine For energy generation and Green Development" Preprints. https://doi.org/10.20944/preprints202304.0874.v1
Abstract
Small hydro-power systems seem to be the best solution for energy generation through the use of pump as turbine (PAT) due to its low cost and lesser environmental hazards associated with it. Recently, PAT applications are gaining global attention in energy generation but its operation is not fully understood. The performance and flow behavior is affected by several operational conditions. This study seeks to investigate the effects of rotational speed on flow behavior and performance of a PAT. Rotational speed is an important physical parameter that affects the operation of a PAT. A selected centrifugal pump model of four blades and splitters was used for the study. Numerical simulations were carried out using k-ε turbulence model to solve the three-dimensional (3D) equations in both pump and PAT modes. The outcomes were then validated using experimental results in the pump mode to obtain overview flow physiognomies. The results predicted that the efficiency increases as the rotational speed increases in the pump mode whereas in turbine mode, higher rotational speed cannot convert hydraulic energy into mechanical energy. Thus, a rotational speed of 1500 rpm performed the highest efficiency of 69.8% at QBEP among the other rotational speeds selected. Moreover, the head performance in the turbine mode increases as the flow rate increases. This research provides useful information which will help improve PAT performance as well as selecting PAT for small hydro-power site.
Keywords
Pump-as-turbine; performance; flow characteristics; rotational speed; small hydro-power
Subject
Engineering, Energy and Fuel Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
