Homework #9 part 1: estimate the adiabatic flame temperature of an acetylene (c2h2) cutting torch, in oc, which uses a stoichiometric amount of pure oxygen. part 2: .octane (c8h18) is burned in a constant pressure adiabatic combustor of an aircraft engine with 40% excess air. the air enters this combustor at 600 kpa and 307oc, and the fuel is injected into the combustor at 25oc. estimate the temperature at which the products of combustion leave the combustor.

Along steel shaft of 10 cm diameter is austenised at 870°c and then quenched in a liquid at 30oc. the average surface heat transfer coefficient is 2000 w/m2. °c. the relevant thermophysical properties of the shaft are: p=7800 kg/m", k=20 w/mk, cp=0.46 kj/kg. k calculate: a)-the time required for the center temperature to drop to 200°c. b)-the temperature at half-radius at that moment. c)-the amount of heat that had been transferred to the liquid by that time per meter length of the shaft