The effects of the contraction area ratio CR on the flow characteristics of the free jet issued from orifice nozzle are examined and made clear experimentally. The large vortex structure of submerged orifice water jet is visualized by tracer method and examined the effects of CR on it. The mean and fluctuating velocities of orifice air jet are measured by a single probe and hot-wire anemometry and the effects of CR on them are also examined. CR was changed from 1.00 to 0.11. As a result, the following and others are made clear newly. The centerline maximum velocity uc/um can be presented by uc/um=1.9CR3-3.55CR2+1.38CR+1.53. The maximum of uc/um=1.9CR3-3.55CR2+1.38CR +1.53 occurs at CR=0.27 and it is uc/um=1.7.
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SHAKOUCHI et al. (2008) studied this question.
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