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Active Control of Jets in Crossflow

  • Robert T. M’Closkey
  • Jonathan King
  • Luca Cortelezzi
  • Ann R. Karagozian
Part of the International Centre for Mechanical Sciences book series (CISM, volume 439)

Abstract

The present study quantifies the dynamics of actuation for the temporally forced, round gas jet injected transversely into a crossflow, and incorporates these dynamics in developing a methodology for open loop jet control. A linear model for the dynamics of the forced jet actuation is used to develop a dynamic compensator for the actuator. When the compensator is applied, it allows the jet to be forced in a manner which results in a more precisely prescribed, temporally varying exit velocity whose RMS amplitude of perturbation can be made independent of the forcing frequency. Use of the compensator allows for straightforward comparisons among different conditions for jet excitation. Clear identification can be made of specific excitation frequencies and characteristic temporal pulse widths which optimize transverse jet penetration and spread through the formation of distinct, deeply-penetrating vortex structures. Further details on this work may be found in M’Closkey et al. (2002).

Keywords

Duty Cycle Vortex Ring Wave Excitation Smoke Visualization Temporal Pulse Width 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Balas, G. J., Doyle, J. C., Glover, K., Packard, A., and Smith, R. (1995). A-Analysis and Synthesis Toolbox, The MathWorks, Natick, MA.Google Scholar
  2. Broadwell, J. E. and Breidenthal, R. E. (1984). Structure and mixing of a transverse jet in incompressible flow. J. Fluid Mech., 148: 405–412.CrossRefGoogle Scholar
  3. Fric, T. F. and Roshko, A. (1994). Vortical structure in the wake of a transverse jet. J. Fluid Mech., 279: 1–47.CrossRefGoogle Scholar
  4. Eroglu, A. and Breidenthal, R.E. (2001). Structure, penetration, and mixing of pulsed jets in crossflow. AIM J., 39 (3), 417–423.Google Scholar
  5. Gharib, M., Rambod, E., and Shariff, K. (1998). A universal time scale for vortex ring formation. J. Fluid Mech., 360, 121–140.CrossRefMATHMathSciNetGoogle Scholar
  6. Ho, C.-M. and Huang, L.-S. (1982). Subharmonics and vortex merging in mixing layers. J. Fluid Mech., 119: 443–473.CrossRefGoogle Scholar
  7. Johari, H., Pacheco-Tougas, M., and Hermanson, J.C. (1999). Penetration and mixing of fully modulated turbulent jets in crossflow. AIAA J., 37 (7), 842–850.CrossRefGoogle Scholar
  8. Kamotani, Y. and Greber, I. (1972) Experiments on a turbulent jet in a cross flow AIM J., 10: 1425–1429.Google Scholar
  9. Kelso, R. M., Lim, T T., and Perry, A. E. (1996). An experimental study of round jets in cross-flow. J. Fluid Mech., 306, 111–144.CrossRefGoogle Scholar
  10. M’Closkey, R. T., King, J., Cortelezzi, L., and Karagozian, A R (2002). The actively controlled jet in crossflow. J. Fluid Mech., Vol. 452, pp. 325–335.MATHGoogle Scholar
  11. Sanathanan, C. K. and Koerner, J. (1963). Transfer function synthesis as a ratio of two complex polynomials. IEEE Trans. Automatic Control, 8, 56–58.CrossRefGoogle Scholar
  12. Schuller, T., King, J., Majamaki, A., Karagozian, A. R., and Cortelezzi, L. (1999). An experimental study of acoustically controlled gas jets in crossflow. Bull. Amer. Phys. Soc., 44 (8), 111.Google Scholar
  13. Smith, S. H. and Mungal, M. G. (1998). Mixing, structure and scaling of the jet in crossflow. J. Fluid Mech., 357: 83–122.CrossRefGoogle Scholar
  14. Vermeulen, P. J., Grabinski, P., and Ramesh, V. (1992). Mixing of an acoustically excited air jet with a confined hot crossflow. J. Engr. for Gas Turbines and Power, ASME Transactions, 114: 46–54.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Wien 2003

Authors and Affiliations

  • Robert T. M’Closkey
    • 1
  • Jonathan King
    • 1
  • Luca Cortelezzi
    • 2
  • Ann R. Karagozian
    • 1
  1. 1.Department of Mechanical and Aerospace EngineeringUniversity of CaliforniaLos AngelesUSA
  2. 2.Department of Mechanical EngineeringMcGill UniversityUSA

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