Time-marching transonic flutter solutions including angle-of-attack effects

Transonic aeroelastic solutions based upon the transonic small perturbation potential equation were studied. Time-marching transient solutions of plunging and pitching airfoils were analyzed using a complex exponential modal identification technique, and seven alternative integration techniques for the structural equations were evaluated. The HYTRAN2 code was used to determine transonic flutter boundaries versus Mach number and angle-of-attack for NACA 64A010 and MBB A-3 airfoils. In the code, a monotone differencing method, which eliminates leading edge expansion shocks, is used to solve the potential equation. When the effect of static pitching moment upon the angle-of-attack is included, the MBB A-3 airfoil can have multiple flutter speeds at a given Mach number.

[1]  P. Goorjian,et al.  Implicit Finite-Difference Computations of Unsteady Transonic Flows about Airfoils , 1977 .

[2]  T Y Yang,et al.  Flutter Analysis of a Two-Dimensional and Two-Degree-of-Freedom Supercritical Airfoil in Small-Disturbance Unsteady Transonic Flow. , 1980 .

[3]  T Y Yang,et al.  Flutter and Time Response Analyses of Three Degree of Freedom Airfoils in Transonic Flow , 1981 .

[4]  R. Houwink,et al.  A wind-tunnel study of the flutter characteristics of a supercritical wing , 1981 .

[5]  S. Osher,et al.  Stable and entropy satisfying approximations for transonic flow calculations , 1980 .

[6]  H. Ashley,et al.  On the role of shocks in the 'sub-transonic' flutter phenomenon , 1979 .

[7]  D. Rizzetta,et al.  Time-Dependent Response of a Two-Dimensional Airfoil in Transonic Flow , 1979 .

[8]  R. Buskirk,et al.  Implicit calculations of transonic flows using monotone methods , 1981 .

[9]  S. R. Bland,et al.  AGARD two-dimensional aeroelastic configurations , 1979 .

[10]  I. H. Abbott,et al.  Theory of Wing Sections , 1959 .

[11]  Koji Isogai,et al.  Numerical Study of Transonic Flutter of A Two-dimensional Airfoil , 1980 .

[12]  T Y Yang,et al.  Aeroelastic Response Analysis of Two Dimensional, Single and Two Degree of Freedom Airfoils in Low-Frequency, Small-Disturbance Unsteady Transonic Flow , 1979 .

[13]  P. Goorjian,et al.  Computation of Unsteady Transonic Flows by the Indicial Method , 1977 .

[14]  C. J. Borland,et al.  Nonlinear transonic flutter analysis , 1982 .

[15]  J. W. Edwards,et al.  A FORTRAN program for the analysis of linear continuous and sample-data systems , 1976 .

[16]  K. Isogai,et al.  Transonic dip mechanism of flutter of a sweptback wing. II , 1981 .

[17]  E. C. Wynne,et al.  Measured and calculated effects of angle of attack on the transonic flutter of a supercritical wing , 1982 .

[18]  D. Rizzetta,et al.  Computations of the pitching oscillation of a NACA 64A-010 airfoil in the small disturbance limit , 1980 .

[19]  S. R. Bland,et al.  Linear/nonlinear behavior in unsteady transonic aerodynamics , 1983 .

[20]  H. Tijdeman,et al.  Investigations of the transonic flow around oscillating airfoils , 1977 .

[21]  Perturbation Method for Transonic Flows about Oscillating Airfoils , 1976 .

[22]  Alfred G. Striz,et al.  Application of Transonic Codes to Flutter Analysis of Conventional and Supercritical Airfoils , 1981 .

[23]  Effect of Frequency in Unsteady Transonic Flow , 1979 .

[24]  R. Houwink,et al.  Improved Version of LTRAN2 for Unsteady Transonic Flow Computations , 1980 .

[25]  R. N. Desmarais,et al.  Curve fitting of aeroelastic transient response data with exponential functions , 1976 .

[26]  J. W. Edwards,et al.  Flight test results of an active flutter suppression system installed on a remotely piloted research vehicle , 1981 .

[27]  Holt Ashley,et al.  Role of Shocks in the "Sub-Transonic" Flutter Phenomenon , 1980 .

[28]  W. H. Weatherill,et al.  A harmonic analysis method for unsteady transonic flow and its application to the flutter of airfoils , 1982 .

[29]  Woodrow Whitlow,et al.  Time-marching transonic flutter solutions including angle-of-attack effects , 1982 .