3) (0.015 + ?/800) kg/s of liquid octane (C$_8$H$_{18}$) with air entering a combustion chamber at
1.0 atm at 25°C and at a steady rate. If the mixture is lean (too much air) then assume
that there is complete combustion with reactants consisting of: N$_2$, O$_2$, CO$_2$, and H$_2$O. |
On the other hand, if the mixture is rich (too much fuel) assume that there will be some
CO in the exhaust with the exhaust consisting of N$_2$, CO$_2$, CO, and H$_2$O. Assume all
reactants are in the gaseous phase (no liquid water in the exhaust).
a. If the combustion is rich, with (90+?/10)% theoretical air, find the following:
i. The dew point of the exhaust.
ii. $\dot{Q}_{out}$ if the exhaust exits at 127°C.
$T_{dp}$ = _______ $^\circ$C (+ 1$^\circ$C)
$\dot{Q}_{out}$ = _______ kW (+ 1%)
b. If the combustion is lean with (230+?)% theoretical air, find the following:
i. The adiabatic flame temperature.
ii. $\dot{Q}_{out}$ if the exhaust exits at 627°C.
$T_{adi\ fl}$ = _______ $^\circ$C (+ 10$^\circ$C)
$\dot{Q}_{out}$ = _______ kW (+ 1%)
