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Micro Axial Turbine Hill Charts: Affinity Laws, Experiments and CFD Simulations for Different Diameters

Author

Listed:
  • Mariana Simão

    (Department of Civil Engineering, Architecture and Georesources (DECivil) and CEris member, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisboa, Portugal)

  • Helena M. Ramos

    (Department of Civil Engineering, Architecture and Georesources (DECivil) and CEris member, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisboa, Portugal)

Abstract

Water supply systems are one of the main hydraulic systems with significant potential for the installation of micro-hydropower devices. Although there are already some mini-hydropower applications in water supply systems, it is still a huge potential that continues to be under-exploited. The arrangement based on an axial turbine, such as an inline tubular propeller, with different diameters and rotational speeds suitable to exploit the existing potential in the water sector, is fully tested. The turbine with the nominal diameter of 85 mm was analysed through experimental campaigns and numerical models for a large range of heads and flow measurements to access its performance. A good correlation between the physical model and the numerical results were obtained, with mean values of deviation less than 5% regarding flow, mechanical power and efficiency. These results were extrapolated to other similar turbine with 170 mm, using affinity laws to investigate the power extraction performance. Both geometries were also numerically investigated using computational fluid dynamics (CFD) models and comparisons were made between the affinity model and experimental results. The results identified differences when compared with the classical affinity curves. Therefore, new formulations based on affinity equations were proposed for the analyzed axial turbine with different diameters without imposing a constant turbine efficiency since actually it does not keep constant as CFD calibrated model proved. Compared to experimental test efficiencies for different rotational speeds, the new proposed affinity laws provided a maximum error of 12% for both diameters.

Suggested Citation

  • Mariana Simão & Helena M. Ramos, 2019. "Micro Axial Turbine Hill Charts: Affinity Laws, Experiments and CFD Simulations for Different Diameters," Energies, MDPI, vol. 12(15), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:2908-:d:252528
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    References listed on IDEAS

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