Artillery Solid Rocket Ramjet Heat Transfer Of The Insulation Ablative Performance Study

In the current decades, the technology of artillery ammunition developed rapidly abroad. The ramjet projectile takes on a very important place in the field of cannonball of improved range because of its large cannon-shot and high effect-fee proportion. During the study on Solid Rocket Ramjet Engine, ablation of secondary Combustion Chamber insulation can not be ignored. This paper investigates ablation mechanism from experimental and theoretical aspects.Based on structure character of ramjet engine, three-dimensional physical model of flow field is established by gambit. The numerical simulation on combustion flow field in ramjet chamber is put forward by FLUENT software. It is shown that the circumferential temperature gradient in the flow field changes intensively because of the effect of the structure. According to layered character of thermal protection material, ablation model of thermal protection material is established. According to the analysis on the flow field, internal temperature distribution of thermal protection material is solved by ANSYS. This paper also studies the effect of flow field and heat transfer by the transformation of thermal protection material configuration. Because of the transformation of configuration, the effect of .flow field and heat transfer is obvious intensively.Thermo-ablation of thermal protection material is studied under oxygen-poor and oxygen-rich situation by experiment system. It is shown that ablation mechanism is different and oxygen-rich condition is worse than oxygen-poor condition, so the samples in the experiment are burnt through many times. After experiment, scanning electron Microscope finds that thermal protection material forms three layers during ablation, namely, virgin material layer, pyrolysis layer and charring layer, Which verified layered character of thermal protection material. Finally the calculation result is consistent with test data. Then it can be seen that the mechanism analysis is practical, and physical and mathematical model are reasonable.