1. The problem statement, all variables and given/known data This is a question from an exam that my university determined to be so harsh that they allowed resits with uncapped grades. I'm going to be taking such a resit thus I'm trying to figure out the paper: Air at 10oC and 80 kPa enters the diffuser of a jet engine steadily with a velocity of 200m/s and a specific enthalpy of 283.14kJ/kg. The inlet area of the diffuser is 0.4m2. The air leaves the diffuser with a velocity that is very small compared with the inlet velocity. Determine: a) The mass flow rate of the air (5 marks) b) The enthalpy of the air leaving the diffuser (5 marks) 2. Relevant equations pv=mRT modified SFEE: h1 + c12/2 = h2 + c22/2 volumetric flow = velocity x inlet area R = 287J/kg/K 3. The attempt at a solution a) VF = 200m/s * 0.4m2 = 80m3/s mass flow = (pressure x volumetric flow rate)/(gas constant of air x temperature) mass flow = (80000 x 80)/(287 x 283.15) = 78.76kg/s b) for this section I have no idea, all I can say is that the enthalpy is very large in comparison with the inlet. I have been given no values as far as I can tell.