Core size
Encyclopedia
Core size is a parameter used in aeroengine performance engineering to enable a size comparison between jet engine
(e.g. turbofan
) cores.
The alternative core power
parameter is more difficult to compute, but has the advantage that it takes into account not only the basic flow size of the device, but also the impact of core supercharging and turbine rotor inlet temperature.
There are several definitions of core size in use, but the following definition is fairly popular:
where:
High Pressure (HP) compressor entry flow (rather than exit flow) is used in the calculation, because core size is then unaffected by any changes in HP compressor interstage bleed during the engine development programme.
Jet engine
A jet engine is a reaction engine that discharges a fast moving jet to generate thrust by jet propulsion and in accordance with Newton's laws of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, pulse jets...
(e.g. turbofan
Turbofan
The turbofan is a type of airbreathing jet engine that is widely used for aircraft propulsion. A turbofan combines two types of engines, the turbo portion which is a conventional gas turbine engine, and the fan, a propeller-like ducted fan...
) cores.
The alternative core power
Core power
Core power is a parameter used in aeroengine performance engineering to enable a comparison of the power capabilities of jet engine cores....
parameter is more difficult to compute, but has the advantage that it takes into account not only the basic flow size of the device, but also the impact of core supercharging and turbine rotor inlet temperature.
There are several definitions of core size in use, but the following definition is fairly popular:
where:
~ (HP) compressor entry mass flow
~ (HP) compressor exit total pressure
~ (HP) compressor exit total temperature
High Pressure (HP) compressor entry flow (rather than exit flow) is used in the calculation, because core size is then unaffected by any changes in HP compressor interstage bleed during the engine development programme.