Abstract
Concerns over global warming and the need to reduce carbon emissions have prompted the development of novel energy recovery systems. During urban driving, a significant amount of energy is lost due to continuous braking, which can be recovered and stored. The flywheel energy storage system can efficiently recover and store the vehicle's kinetic energy during deceleration. In this study, a Computational Fluid Dynamics (CFD) model was developed to assess the impact of air gap size, and rotor cavity pressure environment on the aerodynamic performance of an enclosed non-ventilated flywheel energy recovery system. Consequently, the flywheel rotor skin friction coefficients for various air gap sizes have been numerically determined to predict the windage losses over a wide operating range. The presented study aims to identify a correlation that accurately fits the rotor skin friction coefficients for a range of air gap sizes and operating conditions. Model validation was carried out to assess the validity of the CFD results, which showed good agreement between numerical and experimental data. The results demonstrated that the increase in the air gap size can lead to up to a 19% reduction in the windage loss depending on the operating speed of the flywheel, while the windage loss can be reduced by 33% when the operating pressure is reduced to 500 mbar. Windage losses can be reduced by 45% when the airgap size is greatest, and the operating pressure is lowest.
Original language | English |
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Title of host publication | Energy and Sustainable Futures: Proceedings of the 3rd ICESF, 2022 |
Publisher | Springer Nature Link |
Pages | 157-167 |
ISBN (Electronic) | 978-3-031-30960-1 |
ISBN (Print) | 978-3-031-30959-5 |
DOIs | |
Publication status | E-pub ahead of print - 12 Aug 2023 |
Event | The 3rd International Conference on Energy and Sustainable Futures (ICESF) - Coventry University Campus, Coventry , United Kingdom Duration: 7 Sept 2022 → 8 Sept 2022 https://www.coventry.ac.uk/research/about-us/research-events/2022/icesf-2022/ |
Conference
Conference | The 3rd International Conference on Energy and Sustainable Futures (ICESF) |
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Country/Territory | United Kingdom |
City | Coventry |
Period | 7/09/22 → 8/09/22 |
Internet address |
Keywords
- Energy recovery
- Mechanical storage
- Taylor-Couette flow
- Skin friction coefficient