EFFECTS OF DIFFUSER LENGTH ON THE PERFORMANCE OF EJECTORS WITHOUT INDUCED FLOW
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
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An investigation of ejectors without induced flow was made to determine the effects of varying diffuser lengths on ejector performance. Four 18-deg half angle conical nozzles having constant exit diameters and different throat diameters and two contoured nozzles having zero-deg half angles at the exit were used as the ejector driving nozzles. Unheated air was used for all tests. The diffuser length-to-diameter ratios were varied between 0.7 and 21.5, and three cylindrical ducts of different diameters were used both with and without a subsonic diffuser. An empirical method was developed to estimate the starting and operating pressure ratios of such ejector configurations using simple-determined one-dimensional normal shock relationships.
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