Title page for ETD etd-07102008-192659


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
  • jet
  • cross-flow
  • pulsed
Date of Defense 2008-07-10
Availability unrestricted
Abstract
The 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.

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