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Optimization study on the downstream section of a radial inflow turbine


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Ansarifard, N ORCID: 0000-0002-7619-1697, Fleming, A ORCID: 0000-0002-2738-4521, Henderson, A ORCID: 0000-0002-7359-6402, Kianejad, SS and Chai, S ORCID: 0000-0001-5186-4456 2018 , 'Optimization study on the downstream section of a radial inflow turbine', paper presented at the The 4th Asian Wave and Tidal Energy Conference (AWTEC 2018), 09-13 September 2018, Taipei, Taiwan.

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The Oscillating Water Column (OWC) is a form of Wave Energy Converter (WEC) plant that is employed to harness the power of ocean waves. UniWave is a vented OWC type that extracts the pneumatic power solely from negative pressure drops in the chamber. Having a different flow profile compared to the conventional OWCs, there is a need for customizing a turbine design for the typical UniWave operation. The design modification of the downstream section in a radial inflow turbine has been considered for efficiency improvements. Being the linking element between the turbine and the chamber, this section has potentials for significant impact on the turbine-chamber flow interaction. Four parameters are selected which mainly affect the shapes of the downstream guide vanes and the duct, and optimization methods are employed for efficiency maximization. Guide vane curvature, radius of the duct and use of a diffuser were shown to affect the efficiency and the downstream losses. An improved downstream section in a turbine-duct geometry can improve the turbine’s peak efficiency by 14%, due to decreasing the pressure losses at the rotor downstream.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Ansarifard, N and Fleming, A and Henderson, A and Kianejad, SS and Chai, S
Keywords: air turbines, oscillating water column, design optimization, downstream guide vanes, duct shape, unidirectional radial turbine, design improvement, optimization, CFD simulations
Journal or Publication Title: AWTEC 2018 Proceedings
Publisher: National Taiwan Ocean University
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Copyright 2018 the authors

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