Optimal design of steady enthalpy probe and test verification

For high precision test requirements of the total enthalpy in the ground thermal shielding test of hypersonic vehicles, a kind of steady enthalpy probe with heat shield was developed. The enthalpy probe test system was designed based on the energy balance principle. And the influence of the sampling tube and the cooling water on the enthalpy value was analyzed by FEM. Then the heat insulating structure, water mass flow and gas mass flow were designed and optimized. Finally, the verification test was implemented in the arc heater flow field. The test results show that the design of the enthalpy probe parameter is reasonable, the enthalpy probe structure has a good insulating performance, the repeatability accuracy of the enthalpy probe is better than 2.6%, and the deviation of measurement values of the enthalpy probe and the Fay-Riddell method is less than 13.0%.