Patent ID: 7775044

Claim:
A method of providing a non-intercooled cycle for a compound cycle engine, the engine having a rotary engine and a gas turbine connected in series, the method comprising the steps of: a) compressing air in a compressor section of the gas turbine, b) pre-mixing fuel with the compressed air to obtain an air/fuel mixture, c) injecting the pre-mixed air/fuel mixture into the rotary engine, wherein a volumetric compression ratio R vc in the rotary engine is below 3.5, d) combusting the air/fuel mixture, e) extracting energy from the combusted air/fuel mixture through expansion in the rotary engine, and f) further extracting energy from the combusted air/fuel mixture using a turbine section of the compound cycle engine, wherein the compressor section compresses the air according to a pressure ratio PR gt , and wherein the pressure distribution between the rotary engine and the compressor section is defined by the following relation: PR gt ×R vc 1.3 <30.