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- W800147722 abstract "This thesis reports a two part investigation of single- and two-stage ejector systems in which primary fluid is steam and secondary fluid is air. The first part is an experimental investigation. The vacuum created by ejector is strongly affected by distance betweenthe steam nozzle outlet and diffuser throat section. The relation between this distance, which is called in this thesis the nozzleoptimum distance (Lop), and geometrical and operating parameters of nozzle and diffuser were investigated and forms object of this part of thesis.The second part is a theoretical approach. The exit Machnumber for nozzle was found by using one-dimensional gasdynamic equations together with first law of thermodynamics.Also a two-dimensional approach using Method of Characteristics was used to find exit Mach number and characteristic net of flow from throat to outlet of nozzle. Two computer programmes were written on basis ofthese two different theoretical techniques and comparison between results for exit Mach number found to be 95% in agreement over pressure range of experimental work. Acomputer programme was also written using Method of Characteristics to find shape i.e. characteristic net and constant density lines within flow of steam jet leaving thenozzle and entering diffuser. It is believed that jet diameter at point where it meets diffuser wall, which is called in thiswork the optimum jet diameter (Dop), is strongly related to nozzle optimum distance (Lop). When characteristic net for thejet is drawn, its point of interception with diffuser wall can be found and then (Dop) can be measured. This diameter (Dop) was then related to ejector dimensional parameters and ejectoroperating conditions; an equation was found to predict optimum jet diameter from this equation (Dop)e. Then predicted optimumnozzles distance (Lop)e was determined by using this computerprogram where characteristic net meets diffuser wall at thecalculated optimum jet diameter (Dop)e. Finally, experimentallydetermined value of nozzle optimum distance (Lop) was compared to theoretically predicted value, and average error was found to be 1.23%." @default.
- W800147722 created "2016-06-24" @default.
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- W800147722 date "1990-01-01" @default.
- W800147722 modified "2023-09-27" @default.
- W800147722 title "Steam air ejector performance and its dimensional parameters" @default.
- W800147722 hasPublicationYear "1990" @default.
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