I got a homework problem,
Consider a turbojet in an airplane flying at standard sea level conditions with a velocity of 800 ft/s. The pressure ratio across the compressor is 12.5:1. The fuel to air ratio is .05. The nozzle exhausts flow to ambient pressure. Find the temperature of the exhaust. Assuming that the air in the diffuser is slowed to a very low velocity before entering the compressor and the heat released per pound of fuel is 1.4x10^7 ft lb/lbm.
Sea level conditions are :
temperature =518.69 degrees R
pressure = 2116.2 lb/sq ft
2007-07-05 05:19:49 · 5 answers · asked by Howard 1 in Cars & Transportation ➔ Aircraft
lol, i think its theoretical in the ideal turbojet case, this is for an aerospace engineering course im taking. i didnt know if any aerospace engineers hung out in here
2007-07-05 05:38:38 · update #1
Um no, I coppied the question word for word from the book...
2007-07-07 07:57:36 · update #2
roughly 700 degrees celsus :) I dont have my engine engineering books to provide calculations. my tuerboprop helicopter engine varies between 670 and 770 degrees celsius
2007-07-05 11:10:01 · answer #1 · answered by Anonymous · 1⤊ 1⤋
Folks, the question is about Exhaust gas temp, not turbine inlet temp. EGT is the proper guage to use. Even if you could figure out the answer to the question, it all depends on where the EGT is placed. Closer to the engine the hotter it will be. Move it back a few inches and it may be 100 degrees cooler.
2007-07-07 16:14:17 · answer #2 · answered by eferrell01 7 · 0⤊ 0⤋
Good for you if you can figure this one out. For us idiot jet jocks they were kind enough to put an EGT Gage for each engine right there in front of us. EGT means exhaust gas temperature by the way. Now if they'd just stop confusing the issue with this Celsius and Fahrenheit stuff.
2007-07-05 05:34:04 · answer #3 · answered by Anonymous · 2⤊ 0⤋
first of all EGT is a term used with recip engines I think you mean ITT
ITT = Inlet turbine temprature
EGT = Exhaust Gas Temprature
I think you question is a bit backwards. the air is compressed before it reaches the difusser . the difusser is located after the last stage of compession.
2007-07-07 05:43:12 · answer #4 · answered by Anonymous · 0⤊ 0⤋
And the answer isssssssssssssssssssssssssss???
Which engine?
BTW EGT is wayyyy out of style. Now it's T4 or TIT or (Depends on the engine) some other location.
EGT was a very inaccurate place to take the temp. it was at the outlet and not very good (But the best we had at the time.
Now it is still used in piston engines
2007-07-05 05:32:02 · answer #5 · answered by walt554 5 · 1⤊ 2⤋