Flow Modification by Tubercles in Brazilian Free-tailed Bats
Abstract
Flow over Brazilian free-tailed bat ears is believed to be modified by tubercles found along their leading edge. The study observes this modification through flow visualization over the bat ear models and through PIV analysis of tubercles transposed onto a NACA-0012 airfoil. Flow visualization depicted a change in flow over the two bat ears, which may be related to modification of flow separation. The PIV study on the airfoils indicated reduction of drag at low angles of attack (< 10�) for the bat ear with tubercles and increased drag past these angles of attack. It was also found that the bumped airfoil experienced a delay in stall compared to the smooth NACA-0012 airfoil. These flow characteristics are beneficial to the bats as they aid in their flying ability and feeding habits.
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- OSU Theses [15752]