Question

Consider a rocket engine using ethyl alcohol (ethanol), C2H,OH as fuel and oxygen, O2, as oxidizer. Ethyl alcohol and oxygen enter the chamber as, respectively, a liquid at temperature T,C2H5OH = T,-29 8.1 5 K and a gas at temperature to2 =-40°C. The combustion reaction is o.0 where Alco , Aco2 , M2 , 20 arethe mole fractions of the products. The table below shows the mole fractions of the combustion products and their average specific heats and heats of formation; the sum of mole fractions of the products is unity, -μ=1.00. Vaporization heat of liquid ethyl alcohol (at T,) is GyAPCaHSOH 42400 kJ/kmol; heat of formation of gaseous ethyl alcohol (gas) at T, is h c2HSOH235 300 kJ/kmol; and the average specific heat of the reactant o, is Cpo2 -29.0 kJ/kmol-K H,O H2 CO ACO 0.33 35.0 -110,527 CO Aco2 0.07 58.0 393404 0.36 47.0 -241,826 mole fraction μ Cp, kJ/kmol-K hy, kJ/kmol 0.24 32.0 a) Determine stoichiometric coefficients x and y and calculate the oxidizer-to-fuel mass ratio b) Calculate adiabatic flame temperature, T

Answer 1

33200) --yagys. 275 k丁 -3934 58 (T-296) 0.361 8F-298))

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