Published Papers
     Search Papers (Springer,
   After 2008)
     Search Papers (Dbpia,
   Until 2007)
     Search Papers (JMST
   own data base)
       - Classification By Year   
       - Classification By Topic
     Special Issues
   
           
   
 
 
Subject Keyword Abstract Author
 
 
Unsteady thin airfoil theory revisited for a general deforming airfoil

Christopher O. Johnston, William H. Mason, Cheolheui Han*
The Journal of Mechanical Science and Technology, vol. 24, no. 12, pp.2451-2460, 2010

Abstract : The unsteady thin airfoil theory of von Karman and Sears is extended to analyze the aerodynamic characteristics of a deforming airfoil. The von Karman and Sears approach is employed along with Neumark¡¯s method for the unsteady load distribution. The wake-effect terms are calculated using either the Wagner or Theodorsen function, depending on the desired camberline deformation. The concept of separating the steady and damping terms in the camberline boundary condition is introduced. The influence of transient and sinusoidal airfoil deformations on the airfoil load distribution is examined. The general equations developed for the unsteady lift and load distribution are evaluated analytically for a morphing airfoil, which is defined here by two quadratic curves with arbitrary coefficients. This general camberline is capable of modeling a wide range of practical camberline shapes, including leading and trailing edge flaps. Results of the present model are shown for a variable camber, or morphing, airfoil configuration. The influence of transient and sinusoidal motion on the force coefficients and load distribution is addressed.

Keyword : Morphing airfoil; Thin airfoil theory; Von Karman and Sears approach; Unsteady aerodynamics

 
 
 
 
 
JMST Editorial Office: #702 KSTC New Bldg, 22 7-gil, Teheran-ro, Gangnam-gu, Seoul 06130, Korea
TEL: +82-2-501-3605, E-mail: editorial@j-mst.org
JMST Production Office: #702 KSTC New Bldg, 22 7-gil, Teheran-ro, Gangnam-gu, Seoul 06130, Korea
TEL: +82-2-501-6056, FAX: +82-2-501-3649, E-mail: editorial@j-mst.org