Engineering: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] Jet engines use either EPR or compressor/fan RPM as an indicator of thrust.[2] When EPR is used, the pressures are measured in front of the compressor and behind the turbine.
Integrated engine pressure ratio
The integrated engine pressure ratio (IEPR) is a ratio used on some turbofans to include fan discharge total pressure and compressor inlet total pressure. If compressor inlet pressure is P0 and fan discharge total pressure is P1 , then the integrated engine pressure ratio will be P1 /P0. [3]
The IEPR is an engine indicator system unique to the Rolls-Royce RB211.
See also
References
- ↑ Glenn Research Center (NASA). "Pressure variation - EPR". http://www.grc.nasa.gov/WWW/k-12/airplane/epr.html.
- ↑ "Engine Pressure Ratio (EPR)". http://code7700.com/epr.html.
- ↑ "integrated engine pressure ratio". aviation_dictionary.en-academic.com. https://aviation_dictionary.en-academic.com/3854/integrated_engine_pressure_ratio.
- The Boeing Company Engine thrust control system US Patent 4248042 Includes Boeing's discussion on EPR or IEPR being a better indicator of thrust.
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