The Lockheed C-130J Super Hercules is a military transport aircraft with turboprop engines. Turboprop engines are a type of gas turbine engine, and their thermal efficiency can be assessed using specific fuel consumption (SFC), which is the amount of fuel consumed per unit of thrust or power produced.
The thermal efficiency is expressed mathematically as:
where:
- is the thermal efficiency,
- is the thrust produced by the engine,
- is the jet velocity,
- ṁf is the mass flow rate of fuel,
- is the specific enthalpy of the fuel.