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- W2741103629 abstract "EVALUATION OF A HEMISPHERICAL HEAD FLOW DIRECTION SENSORFOR INLET DUCT MEASUREMENTSDonald L. BennettFlight Research CenterINTRODUCTIONThe primary function of an airplane inlet is to provide the engine with highpressure, uniform airflow. The quantity of the airflow must be varied to match theengine's airflow requirements. High performance, high speed aircraft like theYF-12 airplane resort to bypass systems to meet the flow variance requirement(ref. 1). However, there have been problems with these systems. Opening orclosing the bypass doors rapidly has resulted in engine surges or stalls.For a fuller understanding of the physical phenomena that occur during enginestalls and surges, dynamic flow angularity measurements are desirable in additionto pressure distortion and inlet pressure recovery measurements. To make thesemeasurements in the inlet of the YF-12 aircraft, a fixed hemispherical head flowdirection sensor was designed and built at the NASA Flight Research Center.Devices of this type have been extensively investigated (refs. 2 to 5). However,the external configuration of the device designed for the YF-12 airplane was dissim-ilar to that of most of the sensors investigated because of the close coupling of thetransducer assembly and the probe tip. The close coupling was incorporated toimprove the accuracy of the dynamic measurements.This paper describes the sensor and presents and discusses calibration dataacquired during wind tunnel tests of the flow direction sensor. The tests were madein the 6- by 6-Foot Wind Tunnel at the NASA Ames Research Center. The tests weremade at Mach numbers of 0.30, 0.40, 0.50, 0.60, and 0.70 and at Reynolds numbersof 3.28 X 106 per meter (1.0 X 106 per foot) and 4.92 X 106 per meter (1.5 X 106 perfoot). Most of the data presented are for Mach numbers of 0.30, 0.50, and 0.70.Several techniques for determining flow angles are described, and the results ofroom temperature laboratory frequency response evaluations are presented.SYMBOLSPhysical quantities in this report are given in the International System ofUnits (SI) and parenthetically in U.S. Customary Units. The measurements were" @default.
- W2741103629 created "2017-08-08" @default.
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- W2741103629 date "1975-01-01" @default.
- W2741103629 modified "2023-09-24" @default.
- W2741103629 title "EVALUATION OF A HEMISPHERICAL HEAD FLOW DIRECTION SENSOR TOR INLET DUCT MEASUR" @default.
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