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
  1. Glenn Research Center (NASA). "Pressure variation - EPR". Retrieved January 2, 2015.
  2. "Engine Pressure Ratio (EPR)". code7700.com. Archived from the original on 2014-10-04.
  3. "integrated engine pressure ratio". aviation_dictionary.en-academic.com. Retrieved 2023-06-07.
  • 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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