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Preliminary Design and Evaluation of an Airfoil with Continuous Trailing-Edge FlapThis paper presents the preliminary design and evaluation of an airfoil with active continuous trailing-edge flap (CTEF) as a potential rotorcraft active control device. The development of structural cross-section models of a continuous trailing-edge flap airfoil is described. The CTEF deformations with MFC actuation are predicted by NASTRAN and UM/VABS analyses. Good agreement is shown between the predictions from the two analyses. Approximately two degrees of CTEF deflection, defined as the rotation angle of the trailing edge, is achieved with the baseline MFC-PZT bender. The 2D aerodynamic characteristics of the continuous trailing-edge flap are evaluated using a CFD analysis. The aerodynamic efficiency of a continuous trailing-edge flap is compared to that of a conventional discrete trailing-edge flap (DTEF). It is found that the aerodynamic characteristics of a CTEF are equivalent to those of a conventional DTEF with the same deflection angle but with a smaller flap chord. A fluid structure interaction procedure is implemented to predict the deflection of the continuous trailingedge flap under aerodynamic pressure. The reductions in CTEF deflection are overall small when aerodynamic pressure is applied: 2.7% reduction is shown with a CTEF deflection angle of two degrees and at angle of attack of six degrees. In addition, newly developed MFC-PMN actuator is found to be a good supplement to MFC-PZT when applied as the bender outside layers. A mixed MFC-PZT and MFC-PMN bender generates 3% more CTEF deformation than an MFC-PZT only bender and 5% more than an MFC-PMN only bender under aerodynamic loads.
Document ID
20120006022
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Shen, Jinwei
(National Inst. of Aerospace Hampton, VA, United States)
Thornburgh, Robert P.
(Army Research Lab. Hampton, VA, United States)
Kreshock, Andrew R.
(Army Research Lab. Hampton, VA, United States)
Wilbur, Matthew L.
(Army Research Lab. Hampton, VA, United States)
Liu, Yi
(National Inst. of Aerospace Hampton, VA, United States)
Date Acquired
August 25, 2013
Publication Date
January 18, 2012
Subject Category
Structural Mechanics
Report/Patent Number
NF1676L-14486
Meeting Information
Meeting: Future Vertical Lift Aircraft Design Conference
Location: San Francisco, CA
Country: United States
Start Date: January 18, 2012
End Date: January 20, 2012
Sponsors: American Helicopter Society, Inc.
Funding Number(s)
WBS: WBS 877868.02.07.03.02.01
Distribution Limits
Public
Copyright
Other

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