Abstract
Measurements have been made downstream of 16 heated dilution jets injected into a confined annular crossflow in order to investigate inconsistencies in the temperature distribution and the development of individual jets around the annulus. When the dilution air is supplied from a representative feed annulus, the resulting approach velocity produces a complex flowfield that issues through the rear of each dilution hole and, which varies from one jet to another. Measurements of both temperature and velocity in planes parallel and perpendicular to the injection wall have indicated the influence of the exit velocity profiles on the subsequent development of two jets. The structure of a jet is modified by the exit velocity profile, causing distortions of the temperature distribution about the hole center plane. Since each jet has its own mixing characteristics, an irregular temperature pattern around the dilution annulus is produced. Mean vorticity values are calculated from the velocity data and are used to explain differences between the structures of the jets defined here and those of the well-documented single jet issuing into a relatively unconfined crossflow.
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