US Patent 7621116 Gas turbine engine system

An engine system comprises a first transfer positive displacement, volumetric device, at least one second positive displacement, volumetric device, and a transmission in engagement with two adjacent volumetric devices. The transmission has a ratio designed to cause the at least one second volumetric device to rotate at a higher angular velocity than the first volumetric device, inducing expansion of a compressible fluid during continuous flow from the first volumetric device to the at least one second volumetric device while performing work.