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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    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   CH1.PDF 21.93 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01   CH2.PDF 32.34 Kb 00:00:08 00:00:04 00:00:04 00:00:02 < 00:00:01   CH3.PDF 34.62 Kb 00:00:09 00:00:04 00:00:04 00:00:02 < 00:00:01   CH4.PDF 35.40 Kb 00:00:09 00:00:05 00:00:04 00:00:02 < 00:00:01   CH5.PDF 11.50 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01   ETD.PDF 43.14 Kb 00:00:11 00:00:06 00:00:05 00:00:02 < 00:00:01   FIG2_1.PDF 6.83 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG2_2.PDF 5.53 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG2_3.PDF 6.77 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG2_4.PDF 4.69 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG3_1.PDF 4.72 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG3_2.PDF 5.58 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG3_3.PDF 142.02 Kb 00:00:39 00:00:20 00:00:17 00:00:08 < 00:00:01   FIG3_4.PDF 194.28 Kb 00:00:53 00:00:27 00:00:24 00:00:12 00:00:01   FIG3_5.PDF 105.79 Kb 00:00:29 00:00:15 00:00:13 00:00:06 < 00:00:01   FIG3_6.PDF 139.04 Kb 00:00:38 00:00:19 00:00:17 00:00:08 < 00:00:01   FIG3_7.PDF 6.49 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG3_8.PDF 205.59 Kb 00:00:57 00:00:29 00:00:25 00:00:12 00:00:01   FIG3_9.PDF 205.67 Kb 00:00:57 00:00:29 00:00:25 00:00:12 00:00:01   FIG4_1.PDF 7.67 Kb 00:00:02 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG4_10.PDF 6.29 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG4_11.PDF 372.68 Kb 00:01:43 00:00:53 00:00:46 00:00:23 00:00:01   FIG4_12.PDF 6.27 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG4_2.PDF 5.16 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01   FIG4_3.PDF 360.14 Kb 00:01:40 00:00:51 00:00:45 00:00:22 00:00:01   FIG4_4.PDF 363.34 Kb 00:01:40 00:00:51 00:00:45 00:00:22 00:00:01   FIG4_5.PDF 360.00 Kb 00:01:39 00:00:51 00:00:44 00:00:22 00:00:01   FIG4_6.PDF 114.44 Kb 00:00:31 00:00:16 00:00:14 00:00:07 < 00:00:01   FIG4_7.PDF 115.55 Kb 00:00:32 00:00:16 00:00:14 00:00:07 < 00:00:01   FIG4_8.PDF 113.77 Kb 00:00:31 00:00:16 00:00:14 00:00:07 < 00:00:01   FIG4_9.PDF 364.30 Kb 00:01:41 00:00:52 00:00:45 00:00:22 00:00:01   VITA.PDF 5.25 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

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