A perturbation theory and numerical solution, based on the unsteady full potential equation, were developed for unsteady transonic flow about blunt and pointed bodies of revolution undergoing harmonic oscillations. The oscillatory motion was considered to be a small perturbation of the nonlinear steady flow. The coupled equations for the steady and unsteady potentials were solved numerically using a rotating difference scheme. Calculations were performed for ogive-cylinder, ellipse-cylinder, hemisphere-cylinder, and parabolic arc nose shapes undergoing pulsatile and pitching oscillations. Comparisons of the present theory with available experiments and other theories are presented for the surface pressure distribution at quasi-steady state and for the static and dynamic stability derivatives. The agreement is good for the quasi-steady cases. for the unsteady results, further experimental data are needed in order to evaluate the present theory. (DePo)
Unsteady transonic flow over blunt and pointed bodies of revolution
Instationaere transsonische Stroemung ueber stumpfen und spitzen Rotationskoerpern
AIAA-Papers ; 1-14
1978
14 Seiten, 14 Bilder, 19 Quellen
Conference paper
English