Abstract
This study investigates by experiment the influence of the blowing ratio (BR) on the flow structures of an inclined turbulent jet in crossflow (JICF). The experiment was conducted in a water tunnel with the jet issuing from a round nozzle inclined at streamwise-oriented 35o, practically relevant to the film cooling configuration. Laser Induced Fluorescence (LIF) and Particle Image Velocimetry (PIV) were adopted. Four cases of BR = 0.5, 1.0, 1.5, and 2.0 were considered with Reynolds number based on the jet diameter and crossflow velocity Re = 1712. It is shown that the flow patterns change with BR drastically. When BR = 0.5, the hairpin vortices dominate in the JICF. As BR increases, the classic JICF topology recovers and the ubiquitous counter-rotating vortex pair (CRVP) becomes the characteristic feature of the JICF and persists far downstream for BR = 2.0.
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