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《Journal of Shanghai Jiaotong University》 2012-02
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The Effects of Caudal Fin Shape on the Propulsion Performance of Flapping Caudal Fin

ZHANG Xi,SU Yu-min,Wang Zhao-li(State Key Laboratory of Autonomous Underwater Vehicle,Harbin Engineering University,Harbin 150001,China)  
A comprehensive study was presented on the effects of the caudal fin shape on the propulsion performance of a harmonically heaving and pitching caudal fin.A bio-caudal fin propulsion mechanics was designed and a series of hydrodynamic experiments for three caudal fin shapes(the whale caudal fin,the dolphin caudal fin,and the tuna caudal fin) were performed.Then numerical simulations were done.Both the experimental and computational results indicate that the tuna caudal fin produces the highest efficiency,although the mean thrust coefficient and input power coefficient of the tuna caudal fin was the smallest.The characteristics of wake were analyzed to find that not only the wake scale of the tuna caudal fin is the smallest,but also the vorticity magnitude of the tuna caudal fin is the weakest.
【Fund】: 国家自然科学基金资助项目(50879014);; 高等学校博士学科点专项科研基金资助项目(200802170010)
【CateGory Index】: U664.3
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