- #1
djw42
- 2
- 0
Ladies and gentlemen.
I have been trying for literally days on this problem and its completley done me in.
The problem is as follows.
I have to evaluate a jet engine using the SFEE equation.
So far I have concluded that this equation will be the best to use...
Qr – Wrx = ṁ Δ [ h + ½ Ṽ2].
Although my problem is I only have the following data available to me...
"h0e/he ratio of total-to-static enthalpy at exit from the engine
h1 J/kg enthalpy at entry to the engine
Ṽ1 m/s airspeed at entry to the engine
ṁ engine air mass flow rate, kg/s
κ fraction of fuel energy input lost to the atmosphere
Pe static pressure the engine exit, kPa
You should assume Cp/R for the exhaust gases to be 4.33, and take the calorific value of the fuel to be 43 MJ/kg."
and I cannot work out for the life of me how to do it.
I really hope someone on here can help.
Thanks..
Daniel.
I have been trying for literally days on this problem and its completley done me in.
The problem is as follows.
I have to evaluate a jet engine using the SFEE equation.
So far I have concluded that this equation will be the best to use...
Qr – Wrx = ṁ Δ [ h + ½ Ṽ2].
Although my problem is I only have the following data available to me...
"h0e/he ratio of total-to-static enthalpy at exit from the engine
h1 J/kg enthalpy at entry to the engine
Ṽ1 m/s airspeed at entry to the engine
ṁ engine air mass flow rate, kg/s
κ fraction of fuel energy input lost to the atmosphere
Pe static pressure the engine exit, kPa
You should assume Cp/R for the exhaust gases to be 4.33, and take the calorific value of the fuel to be 43 MJ/kg."
and I cannot work out for the life of me how to do it.
I really hope someone on here can help.
Thanks..
Daniel.