U.S. Patent Specifications

In a gas turbine plant adapted to operate according to a cycle at variable pressure but constant volume, a source of air under pulsating pressure comprising a centrifugal compressor having a centrifugal wheel with novable blades and a difTuser with stationary blades arranged downstream with respect to said wheel and adapted to transform into pressure the kinetic energy of the whole air output issuing from said movable blades, a pulsating source of hot gases including at least one combustion chamber fed with air under pulsating pressure from said difTuser for supporting combustion in said chamber, said chamber having an elongated form with dimensions adapted to give the chamber a resonance frequency tuned to the frequency of said pulsating pressure, fuel injecting means delivering fuel into said chamber, and control means for operating periodically said fuel injecting means at the frequency of said pulsating pressure, a gas turbine of the variable‐pressure operated type the intake of which has stationary expansion nozzles freely opened and connected to the said hot‐gas source, and coupling means between said gas turbine and said centrifugal compressor adapted to drive it.