Accession Number:

AD0432133

Title:

BASIC RESEARCH AND DEVELOPMENT IN FLUID JET MODULATORS FOR TURBOPROPULSION SYSTEM CONTROL FOR THE UNITED STATES AIR FORCE.

Descriptive Note:

Rept. for 1 Apr 62-31 Mar 63,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Report Date:

1963-03-31

Pagination or Media Count:

111.0

Abstract:

A study is made of fluid jet devices with no moving mechanical parts, which can serve as rugged sensing and control elements in advanced airbreathing propulsion systems. A basic approach for a quasi-static prediction for the dynamic behavior of controlled jets is presented, and implemented by a digital computer. Experimental results of a basic investigation of the impingement of a turbulent jet onto a flat plate are given for a wide variation of Reynolds numbers, and compared with theory. The static and dynamic interactions of jets with receiver ports are discussed, including theoretical and experimental results. After a discussion of the pressure and temperature environment in which useful enginecontrol pressure sensors must operate, two particular approaches to the sensor problem are presented. The first is a fluid jet relay to detect large regions of relatively stagnant fluid rotating stall cells, which can be indicative of an incipient flow instability, and the second is a blade-wake sensor based on fluid diodes coupled to volumes. Theory and experiment to date indicate considerable promise for these devices, although little of the work presented is complete. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE