軸対称ノズルからの適正膨張超音速層流噴流の構造 : ピトー全圧に及ぼすレイノルズ数の影響〔流体工学, 流体機械〕

概要

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Theoretical and experimental investigations were performed on the structure of a correctly expanded supersonic laminar jet from axisymmetric nozzles. A small perturbation method was used in the theoretical calculation, and the effect of the Reynolds number Re_<De> at the nozzle exit on the Pitot impact pressure on the jet center line is discussed. A low-density wind tunnel was used for the experiments with the Mach number M_e at the nozzle exit of about 2.9 and Re_<De> from 1000 to 1800. The axial and radial Pitot impact pressure profiles were measured, and it was found that the Pitot impact pressure distributions on the jet center line correlate quite well with the parameter x/(D_eRe_<De>), where x is the downstream distance from the nozzle exit and D_e is the nozzle exit diameter. The present theory suggests that the length of the jet potential core increases linearly with the increase in Re_<De>, and this result is found to agree quantitatively well with the results of the experiment.
一般社団法人日本機械学会の論文
1997-12-25