Round Turbulent Air Jet Submitted to a Pulsed Coflow | Zendy

M. Saudreau | Zendy; Jacques Borée | Zendy; Yannick Bury | Zendy; G. Charnay | Zendy

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Round Turbulent Air Jet Submitted to a Pulsed Coflow

Author(s) -

M. Saudreau,

Jacques Borée,

Yannick Bury,

G. Charnay

Publication year - 2004

Publication title -

aiaa journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.828

H-Index - 158

eISSN - 1081-0102

pISSN - 0001-1452

DOI - 10.2514/1.1739

Subject(s) - mechanics , turbulence , jet (fluid) , entrainment (biomusicology) , air entrainment , flow (mathematics) , physics , laser doppler velocimetry , materials science , acoustics , medicine , blood flow , rhythm

Mean and turbulent properties of an unsteady round air jet submitted to a pulsed coflowing airstream were studied from laser Doppler Velocimetry measurements. The ejection velocity of the jet is kept at a constant value, whereas the coflowing stream is pulsed. These measurements revealed that the unsteadiness leads to a longitudinal partition of the jet. Near the jet exit, the flow is a quasi-steady jet flow. Farther downstream, the flow is unsteady with the creation of a large and propagative structure in the jet flow. The objective of the study is comprehen- sive understanding of the main physical mechanisms induced by the coflow unsteadiness. Consequences of the entrainment process are also discussed.

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