Deo, Ravinesh C. 
ORCID: https://orcid.org/0000-0002-2290-6749 and Mi, Jianchun and Nathan, Graham J.
(2007)
The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet.
Experimental Thermal and Fluid Science, 32 (2).
pp. 545-559.
ISSN 0894-1777
Abstract
The paper reports an investigation of the influence of geometric profile of a long slot nozzle on the statistical properties of a plane jet discharging into a large space. The nozzle-exit profile was varied by changing orifice-plates with different exit radii (r) over the range of
0 < r/h < 3.60, where h is the slot-height. The present measurements were made at a slot-height based Reynolds number (Reh) of 1.80 · 104 and a slot aspect ratio (span/height) of 72. The results obtained show that both the initial flow and the downstream flow are dependent upon the ratio r/h. A 'top-hat' mean exit velocity profile is closely approximated when r/h approaches 3.60. The decay
and spread rates of the jet’s mean velocity decrease asymptotically as r/h is increased, with the differences becoming small as r/h approaches 3.60. A decrease in r/h results in a higher formation rate of the primary vortices in the near-field. The far-field values of the centerline turbulence intensity are higher for smaller r/h, and display asymptotic-like convergence as r/h approaches 3.60. Overall, the effect of r/h on the mean and turbulence fields decreases as r/h increases.
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