The measurement and analysis of temperature field in a solid motor nozzle throat insert

To peel off the impact of endothermic reaction caused by the chemical ablation, forging tungsten is used as material for rocket-nozzle insert. In the experiment of a solid motor equipped with forging tungsten nozzle, the thermocouples have been embedded at different radial locations of the nozzle throat insert for measuring temperatures, and the temperature distributions in the rocket-nozzle insert have been obtained. Experimental results show that, for the rocket-nozzle insert made of forging tungsten, the impact of endothermic reaction caused by the chemical ablation is negligible in the throat region; the experimental results are basically consistent with the calculation results. The results and the method presented in this paper can be a reference to the design of nozzles in rocket motors.