EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL

The addition of protuberances, inspired by the humpback whale flipper, on the leading edge of lift producing foils has been shown to improve hydrodynamic performance under a certain range of flow conditions. Specifically, finite wing models have displayed delayed stall characteristics at higher angl...

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Main Authors: Turbine Blades, Timothy Gruber, Mark M. Murray, David W. Fredriksson
Other Authors: The Pennsylvania State University CiteSeerX Archives
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Language:English
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Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.658.821
http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.658.821 2023-05-15T16:35:55+02:00 EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL Turbine Blades Timothy Gruber Mark M. Murray David W. Fredriksson The Pennsylvania State University CiteSeerX Archives http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.658.821 http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.658.821 http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909 Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909 text ftciteseerx 2016-01-08T16:44:33Z The addition of protuberances, inspired by the humpback whale flipper, on the leading edge of lift producing foils has been shown to improve hydrodynamic performance under a certain range of flow conditions. Specifically, finite wing models have displayed delayed stall characteristics at higher angles of attack and increased maximum lift coefficients without significant hydrodynamic penalties. The objective of this project was to investigate the impact that leading edge protuberances (i.e. tubercles) have on the effectiveness of marine tidal turbine blades, especially at lower tidal flow speeds. The experimental results obtained utilizing three different blade designs (baseline and two tubercle modified) are compared. All blades were designed with a 3-D computer aided design software package and manufactured utilizing rapid prototype techniques. The tests were conducted in the 120 ft tow tank at the U.S. Naval Academy using an experimental apparatus that measured flow speed and electrical power generated. Results for power coefficients are presented for a range of tip speed ratios. Cut-in velocity was also used to evaluated the blade designs. For all test criteria, the tubercle modified blades outperformed the smooth leading edge baseline design blades at the lower test velocities, and did not show degraded performance at the higher velocities tested. Text Humpback Whale Unknown
institution Open Polar
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description The addition of protuberances, inspired by the humpback whale flipper, on the leading edge of lift producing foils has been shown to improve hydrodynamic performance under a certain range of flow conditions. Specifically, finite wing models have displayed delayed stall characteristics at higher angles of attack and increased maximum lift coefficients without significant hydrodynamic penalties. The objective of this project was to investigate the impact that leading edge protuberances (i.e. tubercles) have on the effectiveness of marine tidal turbine blades, especially at lower tidal flow speeds. The experimental results obtained utilizing three different blade designs (baseline and two tubercle modified) are compared. All blades were designed with a 3-D computer aided design software package and manufactured utilizing rapid prototype techniques. The tests were conducted in the 120 ft tow tank at the U.S. Naval Academy using an experimental apparatus that measured flow speed and electrical power generated. Results for power coefficients are presented for a range of tip speed ratios. Cut-in velocity was also used to evaluated the blade designs. For all test criteria, the tubercle modified blades outperformed the smooth leading edge baseline design blades at the lower test velocities, and did not show degraded performance at the higher velocities tested.
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author Turbine Blades
Timothy Gruber
Mark M. Murray
David W. Fredriksson
spellingShingle Turbine Blades
Timothy Gruber
Mark M. Murray
David W. Fredriksson
EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
author_facet Turbine Blades
Timothy Gruber
Mark M. Murray
David W. Fredriksson
author_sort Turbine Blades
title EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
title_short EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
title_full EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
title_fullStr EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
title_full_unstemmed EFFECT OF HUMPBACK WHALE INSPIRED TUBERCLES ON MARINE TIDAL
title_sort effect of humpback whale inspired tubercles on marine tidal
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.658.821
http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909
genre Humpback Whale
genre_facet Humpback Whale
op_source http://proceedings.asmedigitalcollection.asme.org/pdfaccess.ashx?PDFSource%3D13%26ResourceID%3D5323909
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