Type of Document Master's Thesis Author Bidan, Guillaume Francois URN etd-07102008-192659 Title Parametric Study of a Pulsed Vertical Jet in Cross-Flow Degree Master of Science in Mechanical Engineering (M.S.M.E.) Department Mechanical Engineering Advisory Committee
Advisor Name Title Dimitris E. Nikitopoulos Committee Chair Keith Gonthier Committee Member Sumanta Acharya Committee Member Keywords
Date of Defense 2008-07-10 Availability unrestricted AbstractThe potential of pulsed vertical jet in cross-flow for film cooling purposes was experimentally
studied and is discussed in this Thesis. A single vertical jet placed in laminar cross-flow conditions was
first characterized in steady state at relatively low blowing ratios ranging from 0.150 to 0.600, using Mie
scattering visualization methods and hot-wire measurements. Wavelet spectral analysis and image
quantification algorithms were applied to the velocity records and averaged visualizations to obtain
quantitative data on the jet characteristic frequencies, penetration and coverage. Two different regimes
characterized by different structures are identified and adapted scaling variables are provided. Trends in
the jet penetration and jet coverage support the transition from one regime to another.
The pulsed jet study is carried at duty cycles of 0.25, 0.50 and 0.70 and forcing frequencies of
0.5, 1.0, 5.0 and 10Hz for a total of 40 studied cases. Similar measurements and processing were applied
to the forced experiments data. The presence of a starting vortex is observed in each case and an attempt
to explain the dynamics of this structure is provided. The image quantification shows an overall decrease
in the performance of the pulsed jet when compared to legitimate steady state cases, even though few
cases exhibit a relative improvement.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access bidan_thesis.pdf 43.41 Mb 03:20:59 01:43:21 01:30:26 00:45:13 00:03:51
If you have questions or technical problems, please Contact LSU-ETD Support.