Accession Number : AD0262484

Title :   THE MEASUREMENT OF UNSTEADY PRESSURES IN WIND TUNNELS

Corporate Author : ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE)

Personal Author(s) : DAVIS, EUGENE L. JR.

Report Date : MAR 1958

Pagination or Media Count : 1

Abstract : Practical solutions to the problem of accurately measuring unsteady pressures in wind tunnels are described, with emphasis on the response of pressure systems, calibration techniques and equipment, and wind-tunnel instrumentation. Basic guides for the selection of a pressuregage-volume-connecting-tubing system are given. A cam-type pulsator calibrator with a sinusoidal pressure variation up to !3 psi and a frequency range up to 5000 c is described. The minimum number of pressure gages required for lift and moment measurements is discussed. A brief comment on the interpretation of pressure fluctuations in terms of velocity fluctuations is given. (Author)

Descriptors :   *MODEL TESTS, *PRESSURE GAGES, *WIND TUNNELS, INSTRUMENTATION, LIFT, MATHEMATICAL ANALYSIS, MEASUREMENT, MOMENTS, PRESSURE, TURBULENCE, VELOCITY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE