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

• 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

Motivation

QueSST :Quiet Supersonic Transport Source: https://www.nasa.gov/image/supersoniccontract.jpg

Supersonic Passenger Jet

• 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

Actuator Design Characteristics

REM Nozzle Model

Experimental Facility

Flow Diagnostic Lab at Tuskegee University

Micro-schlieren System Setup

Light Pulse is less than 100 ns

REM Nozzle Flow-field of Pulsing Jet

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

REM Nozzle Flow-field of Fluid to be Mixed

Fluid to be Mixed Video

REM Flow-field of High Speed Mixing

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

Actuator Characterization

Noise-field Characterization

• 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

• 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

• 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”

Questions????