Ejector mixer

摘要

An ejector mixer has a convergent section and a downstream divergent section downstream of the convergent section. The downstream divergent section has a divergence half angle of 0.1-2.0° over a first span of at least 3.0 times a minimum diameter of the mixer.

主权项

1. An ejector (200; 300; 400; 600) comprising:
a primary inlet (40); a secondary inlet (42); an outlet (44); a primary flowpath from the primary inlet to the outlet; a secondary flowpath from the secondary inlet to the outlet; a mixer having a convergent section (204) downstream of the secondary inlet; a diffuser downstream of the mixer; and a motive nozzle (100) surrounding the primary flowpath upstream of a junction with the secondary flowpath and having an exit (110),wherein:
the mixer comprises a downstream divergent section (206) downstream of the convergent section and having a divergence half angle (θ2) of 0.1-2.0° over a first span of at least 3.0 times a minimum diameter (DMIN) of the mixer; and the diffuser has a divergence half angle of greater than 2.0° over a second span of at least 3.0 times the minimum diameter of the mixer.