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Manipulating Pattern Factor Using Synthetic Jet Actuators

Manipulating Pattern Factor Using Synthetic Jet Actuators. Y. Chen D. Scarborough and J. Jagoda School of Aerospace Engineering Georgia Institute of Technology Atlanta, GA 30332-0150. Outline. Experiment Setup Quick Review of Data Analysis Current Results Conclusions

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Manipulating Pattern Factor Using Synthetic Jet Actuators

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  1. Manipulating Pattern Factor Using Synthetic Jet Actuators Y. Chen D. Scarborough and J. Jagoda School of Aerospace Engineering Georgia Institute of Technology Atlanta, GA 30332-0150 MITE

  2. Outline • Experiment Setup • Quick Review of Data Analysis • Current Results • Conclusions • Future Work MITE

  3. Experimental Facility 3" MITE

  4. Synthetic Jets: Configurations Tested slot 1.6 mm x11.2 mm 2.38mm D orifice plate 4 holes, 4mm apart 20mm D  5 mm flow Z X bottom chamber wall MITE

  5. Configuration of Bleed Ring unit: inch MITE

  6. Diagnostics • Temperature Distribution Measured by Thermocouple Rake • Velocities Measured by Pitot Probe and Hot Film Anemometer • Flow Field Visualized Using High Speed Shadowgraph MITE

  7. Synthetic Jet Velocity 4-hole geometry, 2mm above orifice, hot film data MITE

  8. Actuator Calibration 4-hole geometry MITE

  9. Example Results Uj, av / Uc =0, no actuation • Pitot (avg. velocity) measurements 3mm above orifice plate • Weak orientation effect at high velocity ratio =1.2 =3.6 slot (streamwise) slot (crosswise) MITE

  10. Quantifying Degree of Unmixedness • Many possible methods (max.-min, rms, …) • Entropy approach: • as the temperature profile becomes more uniform the entropy increases • reference every state to an “ideal” fully mixed state reached by complete adiabatic mixing and identified with a uniform temperature MITE

  11. Mixing Enhancement: Velocity and Orientation Dependence  Avg Velocity Ratio Uj, av / Uc MITE

  12. Effect of Synthetic Jet Frequency Peak velocity ratio Uj,p/Uc 4-hole cross geometry MITE

  13. Effect of Synthetic Jet Strength 4-hole cross geometry MITE

  14. Estimate Energy Applied to the Main Flow MITE

  15. Flow Visualization - Shadowgraphy MITE

  16. Conclusions • Significant improvement in removing temperature extremes even for low actuator velocities • Significant increase in mixing effectiveness with increasing jet strength • Above Uj,p/Uc=7 effect levels off • Small effect due to orifice plate geometry (slots/holes) and orientation • Minimal dependence on actuator frequency (at least for low frequencies) MITE

  17. Future Work • Compare Momentum/Velocity Effect and Momentum Flux Effect • Extend Study of the Effects of Actuator Configurations and Orientations on Mixing • Continue Mixing Mechanism Study through • Enhanced Flow Visualization • Local Mixing Measurement • Local Velocity Measurement MITE

  18. Flow Visualization • Cold State acetone and fluorescence • Combustion State Rayleigh scattering MITE

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