EPR is a ratio of
- P4 to P1
- Pfan to P1
- P6 to P1
Explanation from PART66Online
Engine pressure ratio is the total pressure at the turbine discharge, in the jet pipe just behind the last turbine stage, divided by the total pressure at the engine inlet. In this figure the inlet is station 1 and the jet pipe behind the turbine is station 6, so EPR is the ratio of P6 to P1. Station 4 is the turbine inlet, ahead of the turbine, and a straight turbojet like this has no fan, so neither P4 nor a fan pressure is used.
S
sauravkatwal asked · 16 Feb 2013
WRONG ANSWER!!!!!!
Community Comments (6)
P
PART66Online
16 Feb 2013
Everything is correct.
S
sauravkatwal
17 Feb 2013
this pic didn't appeared during quiz, if its so then its okay to say p1 to p6. but in other hand we have different fingers :)
J
Jordi
22 Feb 2021
the formula for the ratio is out to in .For example is a 7 stage engine it is Pt7/Pt2 .
J
Jordi
22 Feb 2021
In my opinion it should be P6 to P1 .
J
Jordi
23 Feb 2021
this is wrong please some moderator change it to P6/P1
J
Jordi
23 Feb 2021
Assuming of course from the image that the right hand sector is the exhaust and the left is the intake.
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