Title page for ETD etd-5055101949711381


Type of Document Master's Thesis
Author Marques, Jr., Steven Joseph
URN etd-5055101949711381
Title Passive Scalar Measurements In Actively Excited Free Shear Flows
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Dancey, Clinton L.
Roe, Larry A.
Vandsburger, Uri Committee Chair
Keywords
  • flow control
  • mie scattering
  • laser-induced fluorescence
Date of Defense 1998-08-17
Availability unrestricted
Abstract

The objectives of this study were to implement a system to

measure mixing in non-reacting flows and to study the mass

transfer characteristics of two actively excited turbulent jets.

This thesis describes the acquisition and analysis of

phase-locked concentration field data using planar Mie

scattering from smoke particles and planar laser-induced

fluorescence of acetone. Both techniques were shown to be

effective in providing information for the actively excited

nozzles. However, the laser-induced fluorescence technique

was superior for revealing detail in the flowfield structure.

Spatial mode control techniques were applied to a triangular

nozzle with vibrating actuators as the three sides and a swirl

nozzle with pulsating tangential air jets. The effect of the

different spatial modes on jet column development and the

far fields of both nozzles is presented. Two- and

three-dimensional iso-intensity contours, showing the relative

intensity of light scattered by the nozzle fluid marker, were

generated to show the flow structure. The areas inside the

iso-intensity contours in the far field were also measured to

determine relative effectiveness of nozzle fluid transport.

Large scale structures were visible in the three-dimensional

iso-intensity contours from both nozzles. In addition, the

transport of seeded nozzle fluid was enhanced by the spatial

mode excitation for both nozzles. Spatial mode excitation

was also able to affect the shape of the far field contour. In

particular, the first counterrotating helical mode, m=1,

generated the greatest effect on nozzle fluid transport and

the most pronounced elliptical contour shape in the far field.

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  APPEND.PDF 41.01 Kb 00:00:11 00:00:05 00:00:05 00:00:02 < 00:00:01
  BIBLIO.PDF 14.47 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01
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  VITA.PDF 5.25 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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