Numerical Determination of Indicial Lift of a Two-Dimensional Sinking Airfoil at Subsonic Mach Numbers From Oscillatory Lift Coefficients With Calculations for Mach Number 0.7
Abstract
The reciprocal equations for relating the incompressible circulatory indicial lift to the lift due to harmonic oscillations have been modified to include the noncirculatory lift associated with apparent-mass effects. Although the apparent-mass effects are impulsive in nature in incompressible flow, the lift due to apparent-mass effects in compressible flow is a time-dependent function. The corresponding reciprocal equations for the total compressible lift are given. By use of the reciprocal equations for compressible flow, the indicial lift and moment functions due to an airfoil's experiencing a sudden acquisition of vertical velocity are determined numerically for Mach number 0.7. Lack of sufficient flutter coefficients prevents the calculation of these functions at other Mach numbers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1951
- Accession Number
- ADA380451
Entities
People
- Bernard Mazelsky
Organizations
- National Aeronautics and Space Administration