Theory and experiment in unsteady aerodynamics

In this paper , we will consider, by means of a historical review, the role of theory and experiment in the development of unsteady aerodynamics. It is not our intention to sum up all the important contributions. We will only try to sketch roughly the changing positions of theory and experiment.

High subsonic and transonic effects on pressure distributions measured for a swept wing with oscillating control surface

An analysis is given of pressure distributions measured on a swept wing model with harmonically oscillating control surface at subsonic to supersonic Mach numbers and at various frequencies. The influence of Mach number and finite span effects is discussed. Some comparisons are made with pressure distributions on a two-dimensional wing and with...

Present status of unsteady aerodynamics for lifting surfaces

A survey is given of existing theoretical and experimental routine methods for determining pressure distributions or generalised forces on oscillating lifting surfaces. Some comparisons between results of theory and experiment are shown. Techniques are indicated to apply measured data in development work. Tunnelwall influence on measurements is...

A method for estimating unsteady pressure distributions for arbitrary vibration modes from theory and from measured distributions for one single mode

A method is proposed to estimate for a lifting surface pressure distributions to be measured for arbitrary vibration modes by the aid of theory and measured distributions for one single mode. Its usefulness is demonstrated on hand of two swept wings of small aspect ratio oscillating in incompressible flow. Due to insensitivity to reduced...