THE EFFECT OF SECOND THROAT GEOMETRY ON THE PERFORMANCE OF EJECTORS WITHOUT INDUCED FLOW

Abstract
An investigation of ejectors without induced flow was made to determine the effects of second throat geometry and position on the starting and operating pressure ratios. Twenty-seven ejector configurations were tested using three 18-deg half angle conical nozzles and one contoured nozzle in combination with six, second throat configurations. Unheated air was used for all tests. The starting and operating pressure ratios were improved by the presence of a second throat. second throat contraction ratio and length of minimum area had the greatest influence on the starting and operating pressure ratios. The limiting second throat contraction ratio determined in this investigation agrees with published NASA results, although the ejector geometries were considerably different. Two methods are presented for estimating the operating pressure ratio of second throat ejector configurations.

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