Dynamics of a hybrid morphing wing with active open loop vibrating trailing edge by time-resolved PIV and force measures

Abstract

et al.. Dynamics of a hybrid morphing wing with active open loop vibrating trailing edge by Time-Resolved PIV and force measures.This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 16095Open Archive Toulouse Archive Ouverte (OATAO)OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Keywords:Morphing Smart materials Wind tunnel experiments Vortex breakdown Harmonic forcing a b s t r a c t A quantitative characterization of the effects obtained by high frequency-low amplitude trailing edge actuation is presented. Particle image velocimetry, pressure and aerodynamic forces measurements are carried out on a wing prototype equipped with shape memory alloys and trailing edge piezoelectric-actuators, allowing simultaneously high deformations (bending) in low frequency and higher-frequency vibrations. The effects of this hybrid morphing on the forces have been quantified and an optimal actuation range has been identified, able to increase lift and decrease drag. The present study focuses more specifically on the effects of the higher-frequency vibrations of the trailing edge region. This actuation allows manipulation of the wake turbulent structures. It has been shown that specific frequency and amplitude ranges achieved by the piezoelectric actuators are able to produce a breakdown of larger coherent eddies by means of upscale energy transfer from smaller-scale eddies in the near wake. It results a thinning of the shear layers and the wake's width, associated to reduction of the form drag, as well as a reduction of predominant frequency peaks of the shear-layer instability. These effects have been shown by means of frequency domain analysis and Proper Orthogonal Decomposition.

An aeroacoustic investigation into the effect of self-oscillating trailing edge flaplets

“…This reduction of vortex shedding noise has been observed on a cylinder with flexible elements on the aft half of the cylinder (Kamps et al, 2016;Geyer et al, 2017). Jodin et al (2017) has showed that by using a similar, but active, trailing edge modification the wake structure is modified and it is this type of flow modification that is thought to be the mechanism behind the low frequency noise reduction. It can be seen that the reduction in the low frequency range has been scattered into the medium to high frequency range (∼ 1 kHz).…”

Morphing of a supercritical wing by means of trailing edge deformation and vibration at high Reynolds numbers: Experimental and numerical investigation

“…This will highlight the effects coming from the vibrating trailing edge in the context of the hybrid morphing. The present article follows the experimental work of G. Jodin et al [5] for a Reynolds number of 1 million. The measurements will be compared with the numerical studies following to provide a validation of both approaches.…”

“…Currently, electroactive morphing is being studied and developed in the context of the European research program of H2020, "Smart Morphing & Sensing for Aeronautical configurations" (www.smartwing.org/SMS/EU). In particular, the hybrid morphing concept, partly bio-inspired, was introduced ([4], [5]) to operate at various time scales.…”

“…Both the Reynolds range and the angle of attack corresponding to take-off/landing flight phases. A previous experimental study in [5] has presented a first analysis of the morphing effects.…”

Combined droop nose and trailing-edges morphing effects on airfoils aerodynamics

“…Aerodynamic performance enhancement and structural mass reduction have been introduced using morphing skill applied to airfoil camper Vale1 et al [5]. Jodin et al [6] have showed that vibrating the airfoil trailing edge with high frequency and little amplitude was capable of rising the lift and reducing the drag consequently. Vasista et al [7] have studied the wing tip droop-nose using morphing technique and explained experimentally the visions from tests and gave some recommendations also they were not envisioned to improve the wing aerodynamic loads coefficients.…”