固体火箭发动机壳体固化过程温度场影响因素分析

Considering the effect of curing reaction heat and the variation of physical properties of the composites during their curing process, the thermal-chemical coupling finite element analysis of temperature field during these processes has been carried out on a Ø1400 mm solid rocket motor case model. The numerical calculations were compared with the experimental results. In order to optimize the curing process and improve the manufacturing level of the case, the analysis has been carried out on the factors affecting the temperature field during the curing process, such as the holding time of maximum temperature, curing temperature deviation and convective heat transfer coefficient. The results show that, absolute error between the thermal-chemical coupling numerical calculation results and the experimental results is less than 6%, so that the reliability of the numerical model is verified. Both the curing process deviation and the fluctuation of heat transfer coefficient have great effect on the inner surface temperature of the insulation layer. In order to ensure the complete vulcanization of the insulation layer, the holding time of the highest temperature should be appropriately prolonged, so as to increase the processing safety factor to about twice.