Rotary internal combustion engine with variable volumetric compression ratio

A rotary engine comprising:

• a rotor body mounted for eccentric revolutions within a stator body to provide rotating chambers of variable volume in an internal cavity of the stator body;
• the stator body having at least a primary inlet port, a secondary inlet port and an exhaust port defined therein and communicating with the internal cavity, the secondary inlet port being located rearwardly of the primary inlet port and forwardly of the exhaust port along a direction of revolutions of the rotor body, the primary and secondary inlet ports being distinct from one another and spaced apart along the direction of the revolutions;
• the primary inlet port communicating with an air source through a primary valve;
• and
• the secondary inlet port communicating with the air source through a secondary valve;
• wherein the relative positions of the primary inlet port and the exhaust port define a first volumetric compression ratio of the engine lower than a volumetric expansion ratio of the engine when the secondary valve prevents the communication between the air source and the secondary inlet port and the primary valve allows the communication between the air source and the primary net port;
• and
• wherein the relative position of the secondary inlet port and the exhaust port defines a second volumetric compression ratio higher than the first volumetric compression ratio when the primary valve prevents the communication between the air source and the primary inlet port and the secondary valve allows the communication between the air source and the secondary inlet port.