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ISSN オンライン: 2642-0554

THE INFLUENCE OF IMPINGING BOUNDARY LAYER VORTICITY PACKETS ON TURBULENT JUNCTURE FLOW BEHAVIOR

Bonnie Marini
Siemens Westinghouse Power Corporation 4400 Alafaya Trail, MC 267, Orlando FL 32836-2399, USA

Charles R. Smith
Department of Mechanical Engineering and Mechanics Lehigh University Bethlehem, PA 18015, USA

要約

An experimental study of the impact of a tip clearance gap in a turbulent juncture flow provides quantitative data, which suggests that the transport and amalgamation of vorticity packets in the impinging boundary layer strongly influence both the development and unsteady behavior of turbulent juncture flows. It is this sporadic, but continued, interaction with boundary layer vortex packets that sustains the strength of the turbulent horseshoe vortex system, and precipitates the unsteady behavior of the system. The presence of a clearance gap beneath the bluff body juncture allows these impinging vorticity packets to escape the juncture region, which results in a less stable, weaker horseshoe vortex system, particularly as the clearance gap is increased.