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International Journal of Aerospace Engineering
Volume 2017, Article ID 8390905, 12 pages
Research Article

Rotating Arm-Based Experimental Study on Droplet Behavior in the Shoulder Region of an Aircraft Aerodynamic Surface

1National Institute of Aerospace Technology (INTA), 28850 Madrid, Spain
2ISDEFE Engineering Systems for Spanish Defense, Beatriz de Bobadilla 3, 28040 Madrid, Spain
3Aerospace Engineering, Fluid Mechanics and Aerospace Propulsion Department, Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, 28040 Madrid, Spain

Correspondence should be addressed to A. Velazquez; se.mpu@zeuqzalev.legna

Received 29 May 2017; Accepted 12 September 2017; Published 26 October 2017

Academic Editor: Kenneth M. Sobel

Copyright © 2017 S. Sor et al. 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.


An experimental study has been performed on water droplet deformation in the shoulder region of an airfoil. The experiments have been carried out in a rotating arm facility 2.2 m long and able to rotate up to 400 rpm (90 m/s). A blunt airfoil model (chord length equal to 0.468 m) was placed at the end of the arm. A droplet generator was used to generate a stream of water droplets with an initial diameter of 1000 μm. An imaging system was set up to record the trajectories and deformations of the droplets in three different regions close to the airfoil shoulder. The base flow field was characterized using a particle image velocimetry system. The experiments show that droplet deformation results in the shoulder region of the airfoil are different from those pertaining to the leading edge region. In particular, droplets in the shoulder region tend to rotate to the direction of the incoming airfoil which generates an interference effect between the droplets that make up the stream. These differences have been quantified applying an existing theoretical model specifically developed for the leading edge region to the results obtained in the present study.