B) Ethyl Alcohol is currently the primary biofuel for vehicle use. Assume a gas

Question

B) Ethyl Alcohol is currently the primary biofuel for vehicle use. Assume a gas turbine engine burns gaseous ethyl alcohol with 100% excess air. Assume complete combustion. The fuel and (dry) air are mixed at a pressure of 20 bar and temperature of 600 K. Combustion occurs in an adiabatic chamber at constant pressure. Similar to how the heat input for a Brayton cycle gas turbine is modeled. ( No CV external W_cv or Q )

FIND the air/fuel ratio (with 100% excess air), AF (kg-DA/kg-fuel) = _______.

Find the composition of the exhaust gas by mol fraction and mass fraction.

FInd R (kJ/kg-K) = ____ (set up a table for the exhaust gas composed of CO2, H20, O2, equivalent N2)

Find the adiabatic flame temperature (combustor exit T with 100% excess air), Texhaust = ______ K

Find the equivalent specific heat transfer (for process 23 in an air-standard cycle), qIn (kJ/kg air)?

( SSSF) ( 1 Kg of dry air in ....then q added....1 kg of dry air out ( proccess from 2-3 )

Explanation / Answer

Solution :

The given combusstion reacction is

C2H5OH+O2 -------------> 2CO2+3H20

From the ideal gas la PV=nRT ,

V=nRT/P, moles of fuel we can obtain from excess air calculations.

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