Variable geometry combustion chamber diffuser structure and application

The invention discloses a variable geometry combustor diffuser structure and application, and belongs to the field of gas turbine combustors. Comprising a diffuser, a flame tube, a casing and inner and outer ring cavities, and airflow flows into the inner and outer ring cavities and the head of the flame tube from a gas compressor and then flows into the flame tube to participate in combustion cooling and mixing; the diffuser comprises an inner diffuser and an outer diffuser; the outer diffuser comprises an outer diffuser plate, a diffuser inlet control part and a diffuser outlet connection part; the outer diffuser plate is formed by uniformly distributing a plurality of arc-shaped diffuser plates along the circumferential direction, and the edges of the adjacent diffuser plates are mutually overlapped; the diffuser inlet control part is installed at the front end of an outer diffuser plate, and the inner diameter change of an air inlet of the outer diffuser is achieved by adjusting the radial position of the