Patent ID: 9140470
Filing Date: 2015-09-22
Classification: F04F,F25B

Abstract:
1. An ejector comprising: a primary inlet; a secondary inlet; an outlet; a primary flowpath from the primary inlet to the outlet; a secondary flowpath from the secondary inlet to the outlet; a mixer convergent section downstream of the secondary inlet; a motive nozzle surrounding the primary flowpath upstream of a junction with the secondary flowpath and having: an actuator coupled to the motive nozzle to drive a relative streamwise shift of the motive nozzle exit and mixer convergent section, wherein: the coupling is effective to provide said relative streamwise shift along a range of motion between a relatively extended condition and a relatively retracted condition; the secondary flowpath passes along an exterior surface of the motive nozzle that experiences the relative streamwise shift; over at least a portion of said range of motion, the exit is within the convergent section; the convergent section has a length (L the motive nozzle, in said portion of said range of motion, protrudes into the convergent section by an overlap (L said portion includes ratios of said overlap to said length including at least 0.4-0.7.