A Study on the Spread of the Rectangular Jets : 2nd Report, Effect of Exit Shape on the Mean Velocity Fields

概要

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An experimental investigation of the mean velocity profiles is presented for the jet issuing into a quiescent ambient air from rectangular exits. Exits having small aspect ratios and differing in shape are utilized. The experimental results of mean properties such as axial velocity decay, half-width, static pressure, etc. are reported. It is found that some of the mean properties show remarkable changes according to the exit shape. Attaching a short length of uniform cross section above the exit plane, the gross appearance of the jet issuing from a smoothly contracted nozzle becomes similar to that issuing from a long channel. An empirical formula, taking the characteristic length as the square root value of the exit area, is presented for axial velocity decay and jet spread in an axisymmetric decay region.
一般社団法人日本機械学会の論文