LAPSE:2023.25696
Published Article
LAPSE:2023.25696
Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine
Bao Ngoc Tran, Haechang Jeong, Jun-Ho Kim, Jin-Soon Park, Changjo Yang
March 29, 2023
Unavoidable tip clearance between blade tip and casing shroud plays an important role in the performance and characteristics of a tidal propeller turbine. In this work, the tip-leakage vortex (TLV) induced in the end-wall region was numerically illustrated by using the shear-stress transport (SST) k−ω turbulence model at various flow conditions and different tip-clearance sizes (TCSs). The swirling strength criterion was employed to visualize the tip-leakage vortex trajectory and investigate vortex evolution according to clearance size change. Although TLV occurs in both design and off-design conditions, vortex intensity develops strongly under excess flow rate with increased tip gap. The extreme influence of TCS on the turbine’s generated power and efficiency was predicted in steady simulations for four TCS cases, namely, δ = 0%, 0.25%, 0.5%, and 0.75%. With the extension of the tip gap, turbine performance was drastically reduced because of vigorous turbulent leakage flow combined with considerable volumetric loss. The effect of TCS on pressure fluctuation intensity were also explored on the basis of the transient simulation statistic. Maximal pressure variation amplitude and dominant frequency were presented in spectrum analysis utilizing fast Fourier transform.
Keywords
computational fluid dynamics (CFD), pressure fluctuation, propeller turbine, tip-clearance size (TCS), tip-leakage vortex (TLV)
Suggested Citation
Tran BN, Jeong H, Kim JH, Park JS, Yang C. Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine. (2023). LAPSE:2023.25696
Author Affiliations
Tran BN: Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea [ORCID]
Jeong H: Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea
Kim JH: Division of Marine Mechatronics, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea
Park JS: Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Busan 49111, Korea
Yang C: Division of Marine Engineering, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo 58628, Korea
Journal Name
Energies
Volume
13
Issue
16
Article Number
E4055
Year
2020
Publication Date
2020-08-05
Published Version
ISSN
1996-1073
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Original Submission
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PII: en13164055, Publication Type: Journal Article
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LAPSE:2023.25696
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doi:10.3390/en13164055
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Mar 29, 2023
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