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This is a bit of work i was set in a class, not homework but we ran through it in class. i have the graph for the first question and know it is write however and getting lost with the next bit mixing up my CH4's. any help would be greatly appriciated, even if its just a push in the right direction.

A gas turbine plant is fuelled by Methane,. After compresssion the air and fuel enter the combustion chamber at a temp of 600K and excess air is supplied in order to limit the temp of the combustion products to 1200K after steady flow, adiabatic combustion.

1) Illustrate the combustion process on a temp-enthalpy axes (have got this question right i believe but wouldnt hurt to double check my graph)

2) Find the volumetric air-fuel-ratio used

3) What air-fuel-ratio would be required to achieve the maximum temp of the combustion products?

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