FIELD: fluidics; jet apparatus used in fire-fighting technique. SUBSTANCE: mixing chamber of foam generator is shifted relative to longitudinal axis of nozzle and diffuser is secured by its large base to flange opposite nozzle. Weight for excitation of self-oscillations is secured on mixing chamber at spaced relation to housing. According to another version, mixing chamber of foam generator is shifted relative to longitudinal axis of nozzle is secured inside housing by means of additional support made in form of thin- walled truncated cone partially embracing the chamber; its larger base is secured to flange opposite nozzle. Weight ensuring excitation of self- oscillations is mounted on mixing chamber before support at spaced relation to housing. EFFECT: increased pressure conversion coefficient in generation of low-expansion. 4 cl, 3 dwg
