Engine pressure ratio
The engine pressure ratio (EPR) is the total pressure ratio across a jet engine, measured as the ratio of the total pressure at the exit of the propelling nozzle divided by the total pressure at the entry to the compressor.[1]
In many gas turbine engines, the EPR is used as the engine rating parameter, i.e. as an easily measurable indication of the thrust that the engine is currently producing.
Integrated engine pressure ratio
The integrated engine pressure ratio (IEPR) is the ratio of the pressure at the core engine exhaust and fan discharge pressure compared to the intake pressure to the gas turbine engine. The IEPR is an engine indicator system unique to the Rolls-Royce RB211.
See also
References
- ↑ Glenn Research Center (NASA). "Pressure variation - EPR". Retrieved January 2, 2015.
- The Boeing Company Engine thrust control system US Patent 4248042 Includes Boeing's discussion on EPR or IEPR being a better indicator of thrust.
External links
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