Next Article in Journal
Experimental Validation of an Onboard Transient Luminous Events Observation System for VisionCube via Ground Simulation Environment
Next Article in Special Issue
CFD Study of the Impact of Variable Cant Angle Winglets on Total Drag Reduction
Previous Article in Journal
Leading-Edge Roughness Affecting Diamond-Wing Aerodynamic Characteristics
Previous Article in Special Issue
Experimental Study of the Aerodynamic Interaction between the Forewing and Hindwing of a Beetle-Type Ornithopter
Article Menu
Issue 4 (December) cover image

Export Article

Open AccessArticle
Aerospace 2018, 5(4), 99; https://doi.org/10.3390/aerospace5040099

Flow Visualization around a Flapping-Wing Micro Air Vehicle in Free Flight Using Large-Scale PIV

1
Department of Aerospace Engineering, Delft University of Technology, 2629HS Delft, The Netherlands
2
Department of Aerospace Engineering, Middle East Technical University, 06800 Çankaya/Ankara, Turkey
*
Author to whom correspondence should be addressed.
Received: 14 August 2018 / Revised: 11 September 2018 / Accepted: 18 September 2018 / Published: 20 September 2018
(This article belongs to the Special Issue Bio-Inspired Aerospace System)
Full-Text   |   PDF [6987 KB, uploaded 20 September 2018]   |  

Abstract

Flow visualizations have been performed on a free flying, flapping-wing micro air vehicle (MAV), using a large-scale particle image velocimetry (PIV) approach. The PIV method involves the use of helium-filled soap bubbles (HFSB) as tracer particles. HFSB scatter light with much higher intensity than regular seeding particles, comparable to that reflected off the flexible flapping wings. This enables flow field visualization to be achieved close to the flapping wings, in contrast to previous PIV experiments with regular seeding. Unlike previous tethered wind tunnel measurements, in which the vehicle is fixed relative to the measurement setup, the MAV is now flown through the measurement area. In this way, the experiment captures the flow field of the MAV in free flight, allowing the true nature of the flow representative of actual flight to be appreciated. Measurements were performed for two different orientations of the light sheet with respect to the flight direction. In the first configuration, the light sheet is parallel to the flight direction, and visualizes a streamwise plane that intersects the MAV wings at a specific spanwise position. In the second configuration, the illumination plane is normal to the flight direction, and visualizes the flow as the MAV passes through the light sheet. View Full-Text
Keywords: micro air vehicle; flapping-wing MAV; free flight flow visualization; particle image velocimetry; helium filled soap bubbles micro air vehicle; flapping-wing MAV; free flight flow visualization; particle image velocimetry; helium filled soap bubbles
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Del Estal Herrero, A.; Percin, M.; Karasek, M.; Van Oudheusden, B. Flow Visualization around a Flapping-Wing Micro Air Vehicle in Free Flight Using Large-Scale PIV. Aerospace 2018, 5, 99.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Aerospace EISSN 2226-4310 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top