(Solved): Problem 1. Calculate the actual fuel/air ratio in the combustor of a real turbojet engine fueled by ...

Problem 1. Calculate the actual fuel/air ratio in the combustor of a real turbojet engine fueled by JP-4, having a combustion efficiency of $99\%$ and limited to a maximum cycle total temperature $T_{t4}=1780\mathrm{K}$. From a parametric analysis of this engine, you have determined the following parameters: ${?}_r=1.128,{?}_c=2.1$ Average specific heats at constant temperature are $c_{pc}=1004\mathrm{J}/\mathrm{kg}?\mathrm{K},c_{pt}=1235\mathrm{J}/\mathrm{kg}?\mathrm{K}$. Use the fuel/air ratio equation in terms of nondimensional engine parameters to determine the actual value of $f$, assuming the ambient freestream temperature is $229\mathrm{K}$, and then determine the equivalence ratio $?$. Is the burner operating with a fuel-rich or fuel-lean mixture? Is the value of $?$ within acceptable flammability limits? If you change the fuel to JP-7, keeping the same engine input, does it change $?$ considerably? Discuss the results, addressing the effects of equivalence ratio on engine performance and emissions.