Prediction and Evaluation of Thrust Augmenting Ejector Performance at the Conceptual Design Stage

摘要

The performance characteristics of thrust augmenting ejectors, based on a computerized one-dimensional analysis technique, are shown. Various loss mechanisms within the ejector are described and the sensitivity of the ejector performance to these loss mechanisms are illustrated. Performance estimates have been made for several ejector configurations for which experimental data are available. Despite the assumptions that have to be made, in order that the problem be tractable for the one dimensional analysis, good agreement between the predicted and experimental values have been obtained. Other more complex (2 D and 3 D) codes have also been examined but were found to be expensive to run and in some cases limited in application. (Author)