An Elementary Theoretical Comparison of the Aerodynamic Characteristics of Jet, Blown and Ejector Flaps

The document aims to provide a basic capability to calculate the aerodynamic performance of jet, blown, and ejector flaps. It avoids complex mathematics and only presents general graphical results that are necessary to perform the elementary theoretical calculations. The graphical data is used to perform some basic comparisons between the jet, blown, and ejector flaps. For the cases considered, the ejector flap was found to provide the best performance. To caution the novice in his use of the theoretical results, some wind tunnel data are presented which appear to contradict the theoretical results. Improper use of the momentum coefficient term and flow separation is noted. (Modified author abstract)