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.
- ^ Glenn Research Center (NASA). "Pressure variation - EPR". Retrieved January 2, 2015.
- ^ "Engine Pressure Ratio (EPR)". code7700.com. Archived from the original on 2014-10-04.