An Experimental Investigation of an Acoustic Method for Measuring Gas Mass Flow

An Experimental Investigation of an Acoustic Method for Measuring Gas Mass Flow

Airflow through the test section of a 1- by 1-ft transonic wind tunnel under subsonic flow conditions was measured by an acoustic method to evaluate feasibility of the method. The method was based on measuring the time of travel of an acoustic signal between a transmitter and a receiver which were l...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: David, L J, Giltinan, T L
Format: Report
Sprache:eng
Schlagworte:
ACOUSTIC EQUIPMENT
ACOUSTIC SIGNALS
AIR
CORRELATION TECHNIQUES
ELECTRIC DISCHARGES
FEASIBILITY STUDIES
GAS FLOW
MATHEMATICAL MODELS
MEASUREMENT
PRESSURE
SUBSONIC FLOW
TEST EQUIPMENT
Test Facilities, Equipment and Methods
TIME
TRANSONIC WIND TUNNELS
WAVE PROPAGATION
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Beschreibung
Zusammenfassung:Airflow through the test section of a 1- by 1-ft transonic wind tunnel under subsonic flow conditions was measured by an acoustic method to evaluate feasibility of the method. The method was based on measuring the time of travel of an acoustic signal between a transmitter and a receiver which were located on opposite walls of the tunnel on a line perpendicular to the direction of airflow. An electrical discharge arc-gap transmitter was developed which emits a signal pressure wave with an output intensity significantly greater than that of the tunnel noise. Calibration of the wave velocity increment under quiescent conditions demonstrated good repeatability. Prepared in cooperation with ARO, Inc., Tullahoma, TN. Rept. no. ARO-PWT-TR-73-5.