放射状不足膨張噴流の時間平均的なセル形状に関する研究(流体工学,流体機械)

概要

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In industries, a radial supersonic jet often occurs in valves of a pipe system and on a surface of a work on which a cooling jet impinges and so on. In order to clarify a flow pattern of such a jet, the radial underexpanded jet issuing from a curved slit nozzle was examined theoretically as well as numerically and experimentally. The flow field is analyzed by the numerical simulation under the assumption of an axisymmetric flow and the visualization using Shadowgraph method and Schlieren method. The slit nozzle consists of two tubes which are set face to face each other. The radial jet is underexpanded from the nozzle and the jet cells are formed in sequence. The cells become shorter as they are further downstream. Tarn's theory for a rectangular jet is extended to the radial jet and applied to the analysis of a length of the 1st cell. The results obtained by the calculation and the experiment are compared to those by the extended theory. As a result, a quantitative agreement was found to be good between them.
一般社団法人日本機械学会の論文
2006-08-25