Resonant Entrainment of a Confined Pulsed Jet

P. G. Parikh; R. J. Moffat

doi:10.1115/1.3241890

Journal of Fluids Engineering | Volume 104 | Issue 4 | Research Paper

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Resonant Entrainment of a Confined Pulsed Jet

P. G. Parikh and R. J. Moffat

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P. G. Parikh, R. J. Moffat

Thermosciences Division, Department of Mechanical Engineering, Stanford University, Stanford, Calif. 94305

J. Fluids Eng 104(4), 482-488 (Dec 01, 1982) (7 pages) doi:10.1115/1.3241890 History: Received January 06, 1981; Online October 26, 2009

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Abstract

This paper reports the discovery of a new resonant entrainment phenomenon associated with a confined, pulsed jet flow. It was found that a confined jet, when pulsed at an organ-pipe resonant frequency of the confinement tube, experiences greatly enhanced entrainment and mixing near the exit end of the confinement tube compared to a steady confined jet. The mixing and entrainment rates for the resonantly pulsed confined jet approach, and in some cases slightly exceed, those for an unconfined pulsed jet. Both visual and quantitative evidence of this phenomenon is presented. The new effect should be of considerable interest in ejector and combustor design, both of which benefit from any enhancement in mixing between a primary and a secondary flow.

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Parikh PG, Moffat RJ. Resonant Entrainment of a Confined Pulsed Jet. ASME. J. Fluids Eng. 1982;104(4):482-488. doi:10.1115/1.3241890.

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Resonant Entrainment of a Confined Pulsed Jet

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