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Manipulating Pattern Factor Using Synthetic Jet Actuators

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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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