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2004•The proceedings of the JSME annual meetingOpen access

The Behavior of Longitudinal Vortices Generated by Vortex Generator Jets in a Backward Facing Step Flow

Kouichi Yamagata, Kouta HIRAKAWA, Takashi Nagumo, Shinji Honami

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Abstract

The paper presents the flow mechanism of a reattachment process over a backward facing step, which is controlled by vortex generator jets (VGJs). The injection of VGJ upstream of the step introduces the co-rotating longitudinal vortices in a separating shear layer. VGJ produces a primary and secondary vortex. The detailed structure of the longitudinal vortices is clarified, and the effect of the vortices on the separating shear layer downstream of the step is observed. The influence of the velocity ratio and the injection pitch on the flow mechanism is also discussed.

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The paper presents the flow mechanism of a reattachment process over a backward facing step, which is controlled by vortex generator jets (VGJs). The injection of VGJ upstream of the step introduces the co-rotating longitudinal vortices in a separating shear layer. VGJ produces a primary and secondary vortex. The detailed structure of the longitudinal vortices is clarified, and the effect of the vortices on the separating shear layer downstream of the step is observed. The influence of the velocity ratio and the injection pitch on the flow mechanism is also discussed.

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Available abstract

The paper presents the flow mechanism of a reattachment process over a backward facing step, which is controlled by vortex generator jets (VGJs). The injection of VGJ upstream of the step introduces the co-rotating longitudinal vortices in a separating shear layer. VGJ produces a primary and secondary vortex. The detailed structure of the longitudinal vortices is clarified, and the effect of the vortices on the separating shear layer downstream of the step is observed. The influence of the velocity ratio and the injection pitch on the flow mechanism is also discussed.

Key concepts: Vortex, Vortex generator, Mechanics, Physics, Flow (mathematics), Starting vortex, Horseshoe vortex, Secondary flow

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