Measurement of Forces and Flow Fields for Biomimetic Clap-Fling Wings

• Main Authors: Chun-Wei Chen, 陳俊為
• Other Authors: 朱錦洲
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/09842621447560213423

碩士 === 國立臺灣大學 === 應用力學研究所 === 96 === The research discusses the Clap-Fling mechanism for the wing-wing interaction of force and flow field at the two kinds of kinematic motion during periodic motion: the wings have translational velocity during fling mechanism and compare with no translational velocity ones. I use Reynolds number and Strouhal number to define the experiment parameters. I measure lift and drag coefficient as functions of non-dimensional time per wing for a range of Strouhal numbers between 1.71 and 2.85 at Reynolds number 8540. I also use DV and CCD to capture the instantaneous streamlines around each wing and then use PIV software flow manager to analysis the vortices and velocity field for this two kinds Clap-Fling motion. My results verify there are two pair vortices between wings during Clap-Fling mechanism and also confirm that Clap-Fling has high lift mechanism. At Strouhal number 2.85, lift coefficient has better enhancement for fling mechanism compare with translational velocity. For the case that translational velocity after fling mechanism at Strouhal number 2.85, lift coefficient has better average lift coefficient during translation. For the Clap-Fling that fling mechanism with translational velocity, lift coefficient enhancement are 50% higher then one wing for Strouhal number 2.85. For the Clap-Fling two different motions, lift coefficient enhancement of fling with translational velocity are also 50% higher then translational velocity after fling for Strouhal number 2.85.