Effects of asymmetrical inflow in forward flight on the deformation of interacting flapping wings

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-01-01 DOI:10.1177/1756829320941002

Dnwm Heitzig, B. V. van Oudheusden, D. Olejnik, M. Karásek

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引用次数: 1

Abstract

This study investigates the wing deformation of the DelFly II in forward flight conditions. A measurement setup was developed that maintains adequate viewing axes of the flapping wings for all pitch angles. Recordings of a high-speed camera pair were processed using a point tracking algorithm, allowing 136 points per wing to be measured simultaneously with an estimated accuracy of 0.25 mm. The measurements of forward flight show little change in the typical clap-and-peel motion, suggesting similar effectiveness in all cases. It was found that an air-buffer remains at all times during this phase. The wing rotation and camber reduction during the upstroke suggests low loading during the upstroke in fast forward flight. In slow cases a torsional wave and recoil is found. A study of the isolated effects showed asymmetric deformations even in symmetric freestream conditions. Furthermore, it shows a dominant role of the flapping frequency on the clap-and-peel, while the freestream velocity reduces wing loading outside this phase.

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前飞不对称流入对相互作用扑翼变形的影响

本研究调查了DelFly II在前向飞行条件下的机翼变形。开发了一种测量装置，在所有俯仰角下都能保持扑翼的足够视角。使用点跟踪算法处理高速相机对的记录，允许同时测量每个机翼的136个点，估计精度为0.25 向前飞行的测量显示典型的拍击和剥离运动几乎没有变化，这表明在所有情况下都有类似的效果。研究发现，在这一阶段，空气缓冲器始终保持不变。上行程过程中的机翼旋转和外倾角减小表明，在快进飞行中，上行程期间的载荷较低。在缓慢的情况下，会发现扭转波和反冲。对孤立效应的研究表明，即使在对称自由流条件下，也会出现不对称变形。此外，它显示了拍打频率对拍击和剥离的主导作用，而自由流速度降低了该阶段以外的机翼载荷。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.