Sonic Elliptic Jet Control with Corrugated Limiting Tab
Publication: Journal of Aerospace Engineering
Volume 32, Issue 2
Abstract
A sonic elliptic jet issuing from a convergent elliptic nozzle with aspect ratio (AR) 2, controlled with flat tabs in their limiting length, with straight edges and corrugated edges is studied in the presence of different levels of pressure gradients. The corrugation geometries studied are triangular and semicircular. Nozzle pressure ratios () studied range from 2 to 5. For all flow conditions, the aerodynamic mixing of the uncontrolled jet and the jet controlled with these tabs placed along the major and minor axes of the nozzle exit is analyzed. The results show that the tab promotes mixing when orientated along major axis and retards mixing when it is oriented along the minor axis. Among the corrugations studied, the mixing promotion caused by semicircular corrugations is better than that caused by triangular corrugations. In addition, the mixing-promoting superiority of semicircular corrugations is found to be independent of nozzle expansion level. The tab with semicircular corrugations fixed along the major axis in the presence of a favorable pressure gradient corresponding to nozzle pressure ratio 5 causes a core length reduction of as much as 72%. The maximum core length reduction associated with the tab with triangular corrugations as well as the uncorrugated tab (plain tab), placed along the major axis, is about 34% at nozzle pressure ratio 3. The waves present in the core of controlled and uncontrolled jets, visualized using the shadowgraph technique, compliment the results inferred from the centerline pressure decay.
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 2 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 7, 2018
Accepted: Jul 30, 2018
Published online: Dec 24, 2018
Published in print: Mar 1, 2019
Discussion open until: May 24, 2019
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