BASIC RESEARCH AND DEVELOPMENT IN FLUID JET MODULATORS FOR TURBOPROPULSION SYSTEM CONTROL FOR THE UNITED STATES AIR FORCE.
Rept. for 1 Apr 62-31 Mar 63,
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
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