Presentation on a resonance enhanced micro-actuator nozzle for supersonic applications

1. Resonance Enhanced Microactuator Nozzle
(REM Nozzle)
Noise-field and Mixing Characteristics of a REM Nozzle
for Supersonic Applications
David Alexander IV
Sigma Xi Research Showcase
April 3, 2017

2. • Motivation
• Goals
• Actuator Design Characteristics
• REM Nozzle Model
• Experimental Facility and Micro-schlieren Setup
• REM Nozzle Flow-field Visualization
• Actuator Characterization
• Noise-field Characterization
Overview

3. Motivation
QueSST :Quiet Supersonic Transport
Source: https://www.nasa.gov/image/supersoniccontract.jpg
Supersonic Passenger Jet

4. • Design and fabricate REM nozzle that can be integrated for high
speed mixing.
• Establish a flow diagnostics lab at Tuskegee University.
• Design micro-schlieren system using LED light pulses <100ns to
capture flow-field.
• Demonstrate the capabilities to mix fluids at a high frequency.
• Characterize the REM Nozzle.
Goals

5. Actuator Design Characteristics

6. REM Nozzle Model

7. Experimental Facility
Flow Diagnostic Lab at Tuskegee University

8. Micro-schlieren System Setup
Light Pulse is less than 100 ns

9. REM Nozzle Flow-field of Pulsing Jet

10. Pulsing Source Jet Video
d=1.5 mm
Processed video
h
NPR= po/patm
1.0mm
Pulsing frequency 21 kHz
NPR=6.7 h/d=1

11. REM Nozzle Flow-field of Fluid to be Mixed

12. Fluid to be Mixed Video

13. REM Flow-field of High Speed Mixing

14. High Speed Flow Mixing Video
d=1.5 mm
Fluid to be mixed
h
NPR= po/patm
Pulsing frequency 21 kHz
NPR=6.7 h/d=1

15. Actuator Characterization

16. Noise-field Characterization

17. • Flow diagnostics lab is established at Tuskegee University.
• Designed and developed an actuator
• The actuator established a frequency range of 13-21 kHz.
• Designed micro-schlieren system using LED light pulses <100ns.
• The high frequency vortex mixes the fluid and propagates
downstream with very high speed.
• REM is promising in supersonic use
Conclusion

18. • Inject tracer particles into the flow to visualize and understand the mixing
quantitatively.
• Laser based imaging techniques will be performed to obtain a mixing rate.
Future Work

19. • Advisor: Dr. John Solomon
• Team: Dr. Nayak, Kyran, Micheal, and Frederic
• Support: Dr. F. Alvi and Dr. P. Kreth
• Machinist: Joe Wilson, Precision Prototype,
Opelika, Alabama
• Machinist: Curtis Kelly, Tuskegee University
• The authors gratefully acknowledge the HBCU-
UP Grant: NSF 1504865
• Tuskegee University Department of Mechanical
Engineering
Acknowledgements
“The Team”

20. Questions????