The reservoir enthalpy of a ground-simulation facility with
air as test gas is ht = 20 MJ/kg. What are a) the maximum possible speed
and the Mach number at the exit of the nozzle, b) the speed and the Mach
number, if the static temperature at the nozzle exit is Texit = 1,000 K (assume
a Lighthill gas at the exit), c) the speed and the Mach number, if in addition
20 per cent of the reservoir enthalpy is frozen? d) What is the general result?