Accession Number : ADP000323

Title :   A Note on Adaptive Wind Tunnels with Imperfect Control,

Corporate Author : ARIZONA UNIV TUCSON DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s) : Sears,William R.

Report Date : JUN 1982

Pagination or Media Count : 17

Abstract : An earlier study of the convergence of the adaptive-wall wind-tunnel scheme for a sinusoidal model in a two-dimensional tunnel is extended to the case where ideal matching at the interface cannot be achieved. It is assumed that, in place of the desired sinusoidal correction, a correction including an extraneous harmonic always occurs. Two different assumptions are made regarding the fitting of this distorted sinusoid to the observed error signal. It is found that the iteration converges for the same range of relaxation constants as for the ideal case, but that unconfined flow is not achieved. For reasonable numerical values, the iteration nevertheless appears to make substantial improvement in a flow involving boundary interference. (Author)

Descriptors :   *Wind tunnels, *Test facilities, *Adaptive systems, *Walls, Two dimensional, Flow fields, Interference, Boundary layer, Boundary layer flow, Control systems, Mathematical models

Distribution Statement : APPROVED FOR PUBLIC RELEASE