Lift and Moment on Oscillating Triangular and Related Wings With Supersonic Edges
Abstract
Expressions for the velocity potential and the lift and moment are derived for thin, oscillating, "arrowhead" type wings with supersonic edges moving at a constant supersonic speed. The triangular wing and any one of the series of wings obtained from it by cutting its rearward part so that the flow normal to the resulting trailing edges remains supersonic are included in the term arrowhead type. Explicit results for the lift and moment are given for the wings undergoing harmonic pitching and vertical oscillations. Closed expressions for the velocity potential, section force and moment coefficients for any arrowhead wing, and total force and moment coefficients for only the triangular or delta wing are developed explicitly to the third power of the frequency of oscillation. These expressions may be sufficient for most practical applications. The wings considered are found to exhibit the possibility of negative damping in torsion for certain ranges of Mach number and axis-of- rotation position. A figure showing the ranges of these parameters for triangular wings is given herein.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1951
- Accession Number
- ADA380542
Entities
People
- Herbert C. Nelson
Organizations
- National Aeronautics and Space Administration