VORTICITY AND CIRCULATION WITHIN TWIN JETS ISSUING INTO A CROSSFLOW

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Presentation transcript:

VORTICITY AND CIRCULATION WITHIN TWIN JETS ISSUING INTO A CROSSFLOW Background Jets issuing into a crossflow have numerous engineering applications. Such flows are dominated by a contra-rotating vortex pair, but what is their strength and decay mechanism? Two very different examples of a jet in a crossflow Objective To investigate the role of turbulent vorticity transport between the vortices in the decay of circulation in the downstream direction. Twin jet arrangement and coordinate system ( = stagger angle = 00, 45o and 90o, Jet ratio R = UJ/UC = 8)

Research Carried Out Key Findings Characteristic ratio: Circulation from integrated vorticity / centre-line line integral of W component velocity. This is approximately constant for a given geometry. Research Carried Out A wind tunnel study was carried out using twin jets with a single nozzle spacing of 5D. Mean velocity and turbulence data were acquired using crossed hot-wire anemometry. Key Findings Variation of circulation in the dominant vortex with downstream distance for different twin jet geometries, together with the single jet case. Tandem (in-line) jets have the greatest circulation, side-by-side jets the least. There is a strong correlation between turbulent vorticity transport and the circulation decay rate. 3rd Int Conf on Heat Transfer, Fluid Mech & Thermodynamics, June 2004, S Africa