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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-478-6

Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
December, 27-30, 2017, BITS Pilani, Hyderabad, India

Numerical Investigation of the Effect of Leading Edge Tubercles at Low Reynolds Number

Get access (open in a dialog) DOI: 10.1615/IHMTC-2017.1470
pages 1055-1059

Аннотация

The Humpback Whale (Megaptera novaeangliae) is the most acrobatic of baleen whales capable of performing high maneuvering skills. The unique fluid dynamic feature of this species is the presence of large rounded protuberances or tubercles along the leading edge of the Humpback Whale flipper. These tubercles act as passive flow control devices that improve the performance and maneuverability of the flipper. In this paper, we perform detailed investigation of the influence of tubercles on the aerodynamic performance of NACA 0012 aerofoil at a Reynolds number, Re = 1000 at low Reynolds numbers. We consider two configurations: (1) the regular NACA0012 airfoil and (2) a modified airfoil with leading edge tubercles, denoted in as BUMP 0012. A simulation over the BUMP0012 configuration shows that the flow is attached in peak region and detached in trough region. The post stall and pre stall characteristics were analyzed in terms of CL and CD with respect to various angles of attack, with and without tubercles. Comparison of stream line patterns, pressure coefficients and aerodynamic force coefficients between the base line airfoil and modified airfoil help us to understand the effect of tubercles.