Added Mass Effect and an Extended Unsteady Blade Element Model of Insect Hovering

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• 作者：Xingyao Yan^a ; ^{zju_yan@163.com} ; Shanan Zhu^b ; Zhongdi Su^a ; Hongjun Zhang^a
• 关键词：added mass ; wake capture ; insect flight ; simplified aerodynamic model
• 刊名：Journal of Bionic Engineering
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：8
• 期：4
• 页码：387-394
• 全文大小：1280 K

文摘

During the insect flight, the force peak at the start of each stroke contributes a lot to the total aerodynamic force. Yet how this force is generated is still controversial. Two current explanations to this are wake capture and Added Mass Effect (AME) mechanisms. To study the AME, we present an extended unsteady blade element model which takes both the added mass of fluid and rotational effect of the wing into account. Simulation results show a high force peak at the start of each stroke and are quite similar to the measured forces on the physical wing model. We found that although the Added Mass Force (AMF) of the medium contributes a lot to this force peak, the wake capture effect further augments this force and may play a more important role in delayed mode. Furthermore, we also found that there might be an unknown mechanism which may augment the AME during acceleration period at the start of each stroke, and diminish the AME during deceleration at the end of each stroke.