Stability and control of very low density axisymmetric jets

Michael P. Hallberg, Paul J Strykowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Jets with sufficiently low densities relative to the ambient environment can support a global instability. The current work experimentally investigates the character of globally unstable low density jets and subsequently employs microjets around the jet periphery in an effort to inhibit their formation. Global instabilities were suppressed for microjet mass flow rates of approximately two percent that of the primary stream for low density (S=0.14) jets. Very low density (S=0.03) axisyrrametric jets required four percent mass flow to suppress the pure tone oscillations and three percent to extend the potential core. Low density and very low density jets were established by introducing a helium jet into ambient fluids of air and sulfur hexafluoride, respectively.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 3rd AIAA Flow Control Conference
Number of pages7
StatePublished - Dec 11 2006
Event3rd AIAA Flow Control Conference - San Francisco, CA, United States
Duration: Jun 5 2006Jun 8 2006


Other3rd AIAA Flow Control Conference
Country/TerritoryUnited States
CitySan Francisco, CA


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