Title page for ETD etd-0902103-171251


Type of Document Master's Thesis
Author Piffaut, Victor
Author's Email Address vpiffa1@lsu.edu
URN etd-0902103-171251
Title Axis-Switching in Square Coaxial Jets
Degree Master of Science in Mechanical Engineering (M.S.M.E.)
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
D. E. Nikitopoulos Committee Chair
R. Devireddy Committee Member
S. Acharya Committee Member
Keywords
  • square coaxial jets
  • axis-switching
Date of Defense 2003-05-09
Availability unrestricted
Abstract
Airflow from single and coaxial contoured nozzles with a square cross section is studied using constant temperature anemometry. The inner to outer jet velocity ratio is 1.5. The Reynolds number of the outer jet based on the hydraulic diameter of the outer nozzle exit is 15,300. Results are compared to previous data obtained with circular nozzles under the same conditions.

Properties of the jets and their shear layers such as turbulence shear layer thicknesses and growth rates were derived from the velocity record. The mixing between the jets and with the external flow was found to be enhanced by passive forcing. Axis switching was observed in the near field of the jets.

Fourier space analysis was conducted. Energies of the preferred modes and their harmonics were computed in the shear layers. A sub-harmonic cascade was observed, evidence of non-linear interaction between the preferred mode and its sub-harmonics.

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