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A compound cycle engine having at least one rotary unit defining an internal combustion engine, a first stage turbine in proximity of each unit, and a turbocharger is discussed. The exhaust port of each rotary unit is in fluid communication with the flowpath of the first stage turbine upstream of it

A compound cycle engine having at least one rotary unit defining an internal combustion engine, a first stage turbine in proximity of each unit, and a turbocharger is discussed. The exhaust port of each rotary unit is in fluid communication with the flowpath of the first stage turbine upstream of its rotor. The rotors of the first stage turbine and of each rotary unit drive a common load. The outlet of the compressor of the turbocharger is in fluid communication with the inlet port of each rotary unit, and the inlet of the second stage turbine of the turbocharger is in fluid communication with the flowpath of the first stage turbine downstream of its rotor. The first stage turbine has a lower reaction ratio than that of the second stage turbine. A method of compounding at least one rotary engine is also discussed.

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1. A method of compounding at least one rotary engine, the method comprising: drivingly engaging a second stage turbine and a compressor in a turbocharger;defining a fluid communication between an outlet of the compressor and an inlet port of each of the at least one rotary engine;defining a fluid c

1. A method of compounding at least one rotary engine, the method comprising: drivingly engaging a second stage turbine and a compressor in a turbocharger;defining a fluid communication between an outlet of the compressor and an inlet port of each of the at least one rotary engine;defining a fluid communication between an exhaust port of each of the at least one rotary engine and an inlet of a first stage turbine, including directing the fluid communication onto blades of a turbine rotor of the first stage turbine, the first stage turbine having a reaction ratio lower than a reaction ratio of the second stage turbine;defining a fluid communication between an outlet of the first stage turbine and an inlet of the second stage turbine of the turbocharger; anddrivingly engaging an engine rotor of each rotary engine and the rotor of the first stage turbine to a common shaft. 2. The method as defined in claim 1, further comprising providing fluid communication between a source of heavy fuel and each of the at least one rotary engine. 3. The method as defined in claim 1, wherein the reaction ratio of the first stage turbine has a value of at most 0.2, and the reaction ratio of the second stage turbine has a value of at least 0.25. 4. A compound cycle engine comprising: at least one rotary unit each defining an internal combustion engine including an engine rotor sealingly and rotationally received within a respective housing, the respective housing defining an inlet port and an exhaust port;a first stage turbine in proximity of the at least one rotary unit, the first stage turbine including a flowpath and a turbine rotor having a circumferential array of blades extending across the flowpath, the turbine rotor of the first stage turbine and the engine rotor of each of the at least one rotary unit being in driving engagement with a common shaft; anda turbocharger including a compressor and a second stage turbine in driving engagement with one another; wherein:an outlet of the compressor is in fluid communication with the inlet port of the respective housing of each of the at least one rotary unit;the exhaust port of the respective housing of each of the at least one rotary unit is in fluid communication with a first portion of the flowpath of the first stage turbine, the first portion of the flowpath being located upstream of the circumferential array of blades of the first stage turbine;an inlet of the second stage turbine is in fluid communication with a second portion of the flowpath of the first stage turbine, the second portion of the flowpath being located downstream of the circumferential array of blades of the first stage turbine; andthe first stage turbine has a reaction ratio lower than a reaction ratio of the second stage turbine. 5. The compound cycle engine as defined in claim 4, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.25. 6. The compound cycle engine as defined in claim 4, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.1 and the second stage turbine has a pressure-based reaction ratio having a value of at least 0.25. 7. The compound cycle engine as defined in claim 4, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.1 and the second stage turbine has a pressure-based reaction ratio having a value of at least 0.25. 8. The compound cycle engine as defined in claim 4, wherein each of the at least one rotary unit is a Wankel engine. 9. The compound cycle engine as defined in claim 4, wherein the flowpath of the first stage turbine is an axial flowpath. 10. The compound cycle engine as defined in claim 4, wherein the compressor and the second stage turbine are in driving engagement with one another through a turbocharger shaft rotatable independently of the common shaft. 11. The compound cycle engine as defined in claim 4, wherein the compressor and the second stage turbine are in driving engagement with the common shaft. 12. The compound cycle engine as defined in claim 4, wherein the compressor and the second stage turbine are in driving engagement with one another through a turbocharger shaft, and wherein the common shaft is an output shaft having a different axis than that of the turbocharger shaft, the compressor and the second stage turbine each including at least one radial impeller. 13. The compound cycle engine as defined in claim 4, wherein the common shaft is an output shaft connected to the engine rotor of each of the at last one rotary unit, the first stage turbine being drivingly engaged to the output shaft through a transmission. 14. The compound cycle engine as defined in claim 4, further comprising common rail fuel injectors for each of the at least one rotary unit, and a heavy fuel source in communication with the fuel injectors. 15. The compound cycle engine as defined in claim 4, wherein the first reaction ratio has a value of at most 0.2, and the second reaction ratio has a value of at least 0.25. 16. A compound cycle engine comprising: at least one rotary engine each having an engine rotor sealingly and rotationally received within a respective housing having an inlet port and an exhaust port, the engine rotor of each of the at least one rotary engine being drivingly engaged to a common shaft;a first stage turbine in proximity of the at least one rotary engine and having a turbine rotor drivingly engaged to the common shaft;a respective exhaust pipe providing fluid communication between each exhaust port and an inlet of the first stage turbine;a turbocharger including a compressor and a second stage turbine drivingly engaged to one another;an inlet duct providing fluid communication between an outlet of the compressor and the inlet port of each of the at least one rotary engine; anda turbine pipe providing fluid communication between an outlet of the first stage turbine and an inlet of the second stage turbine;wherein the first stage turbine has a reaction ratio lower than a reaction ratio of the second stage turbine. 17. The compound cycle engine as defined in claim 16, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.25. 18. The compound cycle engine as defined in claim 16, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.1 and the second stage turbine has a pressure-based reaction ratio having a value of at least 0.25. 19. The compound cycle engine as defined in claim 16, wherein the reaction ratio of the first stage turbine is a pressure-based reaction ratio having a value of at most 0.1 and the second stage turbine has a pressure-based reaction ratio having a value of at least 0.25. 20. The compound cycle engine as defined in claim 16, wherein the compressor and the second stage turbine are in driving engagement with one another through a turbocharger shaft rotatable independently of the common shaft. 21. The compound cycle engine as defined in claim 16, wherein the compressor and the second stage turbine are in driving engagement with the common shaft. 22. The compound cycle engine as defined in claim 16, wherein the turbine rotor of the first stage turbine is an axial rotor. 23. The compound cycle engine as defined in claim 16, wherein each of the at least one rotary engine is a Wankel engine. 24. The compound cycle engine as defined in claim 16, further comprising common rail fuel injectors for each of the at least one rotary engine, and a heavy fuel source in communication with the fuel injectors. 25. The compound cycle engine as defined in claim 16, wherein the first reaction ratio has a value of at most 0.2, and the second reaction ratio has a value of at least 0.25.