應用皂膜於拍翼下洗之量測

Downwash Measurement of A Flapping Wing Using Soap Film

任治宇(Chih-Yu Jen)

指導教授 ： 楊龍杰

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2019年)

https://doi.org/10.6846/TKU.2019.00703

摘要

本文研究拍翼流場之皂膜顯像，皂膜流場顯現是藉由肥皂薄膜干涉效應，使得光通過後會根據皂膜厚度變化而有不同的顏色表現，拍翼機的拍翼擾動會帶動皂膜的厚度變化，進而以色彩變化的方式表現出流場變化。
本文基於本團隊黃心綸於2014年「二維準定常拍翼流場及其泡膜顯像」進行改良設計，將拍翼前進方向由平行皂膜，改為垂直皂膜(穿出皂膜)。工作分別為調配實驗專用之泡泡液、改良實驗設計、擷取皂膜實驗之影像、處理分析影像，並從中量測拍翼下洗數值，最後與風洞結果做比較。得到之皂膜平均升力數據為風洞數據之87%。本實驗因為屬於定量，未來希望補足定性的風洞煙線實驗，成為一種新的流場觀測方式。

關鍵字

拍翼 ； 皂膜 ； 流場 ； 下洗

並列摘要

In this paper, the novel method utilizing soap film to observe the flow field of the flapping wing MAV is studied. Via mass conservation and Gauss theory applied to the soap-film, the quantitative relationship between the color or thickness field of the soap-film and the corresponding 3D downwash induced by the penetrating flapping wing is derived successfully. The calibration is done using Matlab in order to convert the color red-green-blue (RGB) values from the high-speed image to soap-film thickness by a standard wavelength chart.
This paper is based on the improved design of the “Two-Dimensional Quasi-fixed Wing Flow Field and Bubble Membrane Imaging” conducted by Huang Xinlun and his team in 2014. The moving way of the flapping wings is adjusted to through the soap film orthogonally. The entire process of work includes preparing the bubble liquid for experiment, improve the experimental design, capture the image of the soap film experiment, process the captured image, and measure the value under the wing measurement from the center and finally compare it with the wind tunnel result. The average lift data of the obtained soap film is 87% of the wind tunnel data. Because this experiment belongs to quantitative, it is hoped to supplement the qualitative wind tunnel streak line experiment in the future and become a new way of observation of flow field.

並列關鍵字

Flapping wing micro-air-vehicle(FWMAV) ； Soap film ； Flow film ； Dawnwash

參考文獻

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