When reheat is used, E.P.R
- is reduced.
- remains constant.
- is increased.
Explanation from PART66Online
Reheat (afterburning) adds heat downstream of the turbine and does not change the pressures across the compressor and turbine, so Engine Pressure Ratio stays essentially constant when reheat is selected. The extra thrust comes from accelerating the exhaust, not from a changed EPR.
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dyane_july86 asked · 29 Jan 2013
y?? i dont understand
Community Comments (2)
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trap2307
30 Jan 2013
Rolls Royce's "The Jet Engine" book, page 175 states that as P6 increases in the jet pipe the nozzles are opened to reduce P6 back to its normal value.
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zbd
26 Feb 2013
Generally EPR is only used in civil aviation. Reheat is used in the military jet engine. The engine rating (full throttle engine) are used in military jet instead of EPR. Now civil aviation no more using reheat since concord and Tu-144 already grounded.EPR is the ratio of the turbine discharge pressure to the engine inlet air pressure. Reheat event happen downstream of the turbine,so if EPR is used it remains constant.
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