There exist large errors in measurement of the total enthalpy of high temperature and high speed flow

such as engine tail flame

combustion heating and arc heater. The total enthalpy of high-temperature and high-speed flow was measured by using the enthalpy probe and the heat flux-pressure probe

respectively. The enthalpy probe was the mass suction water-cooled probe with optimized structure

and the heat flux-pressure probe was based on the Fay-Riddell formula. Results indicated that when the enthalpy ranged from 2.5 MJ/kg to 5 MJ/kg

the enthalpy error tested by the enthalpy probe was about 3.38% and the error tested by the heat flux-pressure probe was about 3%. The average enthalpy deviation tested by the enthalpy probe and the heat flux-pressure probe was about 4.65%. These two methods of testing enthalpy can be used to ensure the accuracy in the ground simulation test

which can reduce the error of the tested enthalpy and improve the simulation accuracy.