Low aspect-ratio membrane wing undergoing transient pitching motion at a low Reynolds number

Luke Tregidgo, Z Wang, I Gursul

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

High-speed Digital Image Correlation (DIC) and Particle Image Velocimetry (PIV) measurements were performed on a rectangular, perimeter-reinforced membrane wing with no pre-tension or excess length, with an aspect-ratio of two and at a chord Reynolds number of 46,000. The wing was subjected to a transient sinusoidal pitching manoeuvre in order to understand how the wing might react to an unsteady gust. Three values for the reduced frequency of the gust were tested: k=0.022, k=0.044 and k=0.110. The motion had a pitch amplitude A=10° and was initiated from four starting incidence angles: αs=0°, αs=5°, αs=10° and αs=15°. The membrane deformation characteristics were seen to vary considerably with starting angle; both in terms of time-averaged and instantaneous quantities. The αs=10° case demonstrated significant time-lag in the membrane behaviour, with transient effects extending thirty-seven convective timescales beyond the end of the motion. The PIV flow field measurements for this case showed signs of hysteresis between the pitch-up and pitchdown parts of the wing motion, which was not the case for a rigid wing with identical planform. The fluid-structure interaction was insensitive to changes in the reduced frequency for the range of values tested.
Original languageEnglish
DOIs
Publication statusPublished - 27 Jun 2011
Event41st AIAA Fluid Dynamics Conference and Exhibit 2011 - Honolulu, USA United States
Duration: 27 Jun 201130 Jun 2011

Conference

Conference41st AIAA Fluid Dynamics Conference and Exhibit 2011
CountryUSA United States
CityHonolulu
Period27/06/1130/06/11

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    Tregidgo, L., Wang, Z., & Gursul, I. (2011). Low aspect-ratio membrane wing undergoing transient pitching motion at a low Reynolds number. Paper presented at 41st AIAA Fluid Dynamics Conference and Exhibit 2011, Honolulu, USA United States. https://doi.org/10.2514/6.2011-3583