Discipline: Technology & Engineering
Subcategory: STEM Research
- Tuskegee University
Co-Author(s): Chitra Nayak, David Alexander, Leavon Lewis, Howard Javis
Temporal flow characteristics of a high-frequency supersonic actuator integrated to a nozzle-injector assembly designed for high-speed flow mixing is presented in this paper. This resonance enhanced microactuator nozzle system (REM-Nozzle) injects a fluid through four micro-nozzles of 400 μm diameter each positioned symmetrically around a 1.0 mm nozzle through which a high-frequency supersonic actuation jet pulses out in the frequency range of 13 – 21 kHz. Compressed CO2 is used as mixing fluid and compressed nitrogen is used for generating the actuation jet. The pulsed flow generates strong compressible vortex in the shear layer of steadily injected fluid that entrain and grows downstream enhancing microscale mixing of the injected fluid and nitrogen at very high-speed, and at a designated frequency. This paper summarizes the design details and characteristics of REM-nozzles,–a potential active injection scheme for efficient and controlled flow mixing in high-speed applications, and reports the ongoing studies on pulsed actuator using high-speed microschlieren imaging technique.
Funder Acknowledgement(s): NSF- RIA
Faculty Advisor: None Listed,