Study of a circular cross section thrust augmenting ejector

Abstract

Thrust and mass flow augmentation of an axisymmetric ejector with eight primary nozzles around the inlet periphery is described. Primary nozzle geometry is varied during the tests. Thrust augmentation effects of a cross flow superimposed on the inlet secondary flow are presented. Exit velocity profiles for various flow conditions are given. The effects of diffuser blowing and suction on thrust augmentation are studied. Nomenclature A area D diameter F thrust h height (distance) from surface M mass flow augmentation ratio, ma/m mass flow rate p pressure V velocity a primary flow injection angle 0 primary nozzle location angle 11 plate deflection angle Subscripts a ambient i isentropic m measured p primary s secondary t total 0 primary nozzle exit 2 mixing chamber 3 diffuser exit 4 4 thrust augmentation ratio, F,/F,