複数ノズルエゼクタに関する研究

概要

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An ejector of new type is devised by the author, which has multi-nozzles parallel to the direction of flow.Experiments as of steam ejector carried out and analysed theoretically.The results obtained are as follows.(1) An analysis of a multi-nozzle ejector has been obtained by means of a method similar to an analysis of a single-nozzle ejector.(2) A comparison between the experimental and analytical results showed good agreement over a broad range of variables.(3) Experiments show the length of mixing tube required is about 7〜8d/(√<m>) (d=diameter of mixing tube, m=number of nozzles)(4) It is proved by not only experiment but also analysis that performance of multi-nozzle ejector is better than that of single nozzle ejector equivalent to the former, (5) Divergent type diffuser following mixing tube causes worse effect.(6) The smaller the throat area of nozzles is the lower the steam pressure is the larger the mass ratio of flow is.(7) At constant steam consumption better performance can be obtained when nozzles having the smaller throat area are used and steam of the higher pressure is used.
社団法人日本船舶海洋工学会の論文