Accession Number:

AD0259017

Title:

THE MEASUREMENT OF PRESSURE FLUCTUATIONS IN A HYPERSONIC WIND TUNNEL

Descriptive Note:

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN

Personal Author(s):

Report Date:

1961-06-01

Pagination or Media Count:

1.0

Abstract:

The measurements of pressure fluctuations in a continuous-flow, hypersonic wind tunnel at Mach number 8.08 are described. The prime objective of the measurements was to determine amplitudes and frequencies of the various components of pressure fluctuation and to establish the accuracy with which such measurements might be made. A description of the measurement apparatus, its mode of use, and a sampling of typical pressure fluctuation measurements are presented. Merit factors, providing convenient numerical descriptions of such pressure fluctuations as were encountered, are defined. The test results were used in the assignment of values to these merit figures. Limited accuracy among the test results indicates the need for a dynamic pressure calibration apparatus of wide frequency and amplitude capability. The method used in calibrating the data readout equipment is presented. A treatise on the response of analog readout instruments to input signals representable by time-varying function is also presented. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE