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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >MIMICKING THE MECHANISM OF LIFT GENERATION IN DRAGONFLIES
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MIMICKING THE MECHANISM OF LIFT GENERATION IN DRAGONFLIES

机译：模仿龙骨产生的机制

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Human pursuit of flight has learnt many lessons from nature and a few adaptations have led to phenomenal progress. Insect flight uses complex unsteady aerodynamics to generate lift in addition to producing thrust. A close look at the dragonfly provides some clues to mimic its flight using passive means by separating propulsion and lifting mechanisms. Though the dragonfly can independently flap each of its wings to generate lift and thrust, during forward flight, fore-wings alone flap while the aft-wings remain nearly steady. We adopt this as basis for new passive configurations to generate steady lift. Conceptually, we replace fore-wings with a cylinder that is known to shed vortices, to mimic flapping. A simple plate replaces the aft-wings. Flow analysis of such a configuration at Reynolds Number of 7500 revealed a steady flow topology featuring a trapped vortex over the plote, resulting in steady lift to drag ratio of 3. A further optimized configuration consisting of a semi-circular cylinder upstream and a cambered plate downstream resulted in lift to drag ratio of 14.5, which is considerable for these flow regimes, opening up new possibilities for design of nano-flight vehicles.
机译：人类对飞行的追求已经从自然界中学到了很多经验教训，并且进行了一些改动以取得惊人的进步。昆虫飞行除了产生推力外，还使用复杂的不稳定空气动力学来产生升力。仔细观察蜻蜓提供一些线索，以通过分离推进和提升机制使用被动方式模仿其飞行。尽管蜻蜓可以独立地拍打其每个翼以产生升力和推力，但在向前飞行中，仅前翼拍打，而尾翼保持近乎稳定。我们将此作为新的被动配置以产生稳定升力的基础。从概念上讲，我们用已知会产生涡流的圆柱体代替前翼，以模仿拍打。一个简单的板代替了尾翼。在雷诺数为7500时对这种配置进行的流量分析显示出稳定的流动拓扑，其特征是在绘图上形成了涡流，从而导致稳定的升阻比为3。进一步优化的配置包括上游的半圆柱和弧形板下游导致升阻比为14.5，这对于这些流动状况而言是相当可观的，这为纳米飞行器的设计开辟了新的可能性。

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    G.K Suryanarayana; K.M. Naveen; Vidyadhar Y. Mudkavi;

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    CSIR-National Aerospace Laboratories, Post Box No. 1779, Kodihalli, Bangalore-560 017, India;

    CSIR-National Aerospace Laboratories, Post Box No. 1779, Kodihalli, Bangalore-560 017, India,Siemens Technologies and Solutions, Pvt Ltd, Bangalore;

    CSIR-4~(th) Paradigm Institute, NAL Belur Campus, Bangalore-560 037, India;

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