Three-dimensional vortex interactions were investigated in jets with slanted, indeterminate-origin exit nozzles, and in mixing layers behind a splitter plate with a swept trailing edge. Flow-visualization images were quantitatively processed to characterize complex three-dimensional vortex interactions in non-axisymmetric jets. Phase-conditioned, pulsed laser-sheet illumination was used to obtain a series of sectional images while rotating the asymmetric nozzle. The sectional images were recombined into an unwrapped representation of the developing vortex systems in the shear layer. Partial pairing of sections of adjacent vortex systems was shown to be responsilbe for asymmetric shear-layer growth. Flow visualization in the flow behind the swept trailing edge showed that two families of instability waves can develop with different orientations with respect to the trailing-edge angle. Excitation was shown to enhance waves with orientation parallel to the trailing edge or perpendicular to the mean flow direction, depending on excitation frequency. The wavelengths of the two wave families were identical, and the streamwise spacing depended on the sweep angle.
Trailing-edge sweep and three-dimensional vortex interactions in jets and mixing layers
Die Pfeilung der Fluegelhinterkante und dreidimensionale Wechselwirkungen der Wirbel in Strahlen und Mischschichten
1989
12 Seiten, 12 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
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