Abstract: A gas exhaust nozzle for a gas turbine, the exhaust nozzle having an annular inlet section centered on the axis of the gas turbine, a diffuser, a plenum chamber, and an expansion nozzle. The diffuser extends around the axis with a shape that diverges from the inlet section to the plenum chamber, and comprises an inner first surface and an outer first surface that are concave on the same side. The plenum chamber extends around the axis and is defined firstly by the diffuser and secondly by an outer second surface extending the inner first surface and joining the outer first surface. The plenum chamber includes a radial opening leading into the expansion nozzle, the exhaust gas leaving the expansion nozzle perpendicularly to the axis.

Abstract: A volute (10) with two chambers for a gas turbine (50), including a circumferential conduit (11) in the form of a spiral, a first opening (12) oriented tangentially to the said circumferential conduit (11), toward the outside of the said circumferential conduit (11), and a second circumferential opening (13) located at the center of the said circumferential conduit (11). A wall (15) separates the said circumferential conduit (11) into two symmetrical chambers (18) (19), with a first fluid and a second fluid being able to circulate independently and in an isolated manner between the said first opening (12) and the said second opening (13). The said first opening (12) allows a linear flow of the two fluids between the said circumferential conduit (11) and a chamber exterior to the said circumferential conduit (11), while the said second opening (13) allows a radial flow of the said two fluids between the said circumferential conduit (11) and a chamber interior to the said circumferential conduit (11).