考虑热-化学耦合的NEPE推进剂固化过程数值模拟OA北大核心CSTPCD

The thermal chemical coupling model was used to characterize the thermal conductivity and curing kinetic reaction,and the thermal parameters and density of nitrate plasticized polyether(NEPE)propellant were measured by physical tests.The dis-tribution and evolution of temperature field and curing degree of NEPE propellant during curing were studied.The results show that due to the difference between the heat generation rate of propellant curing reaction and the external heat transfer rate,the distribu-tion of internal temperature field and curing degree field is uneven in the curing process.When the curing time is 1～4 days,the temperature at the center is higher(max.57.6℃)and the temperature at the outer side is lower.When the curing time is greater than or equal to 5 days,the temperature slowly tends to be in equilibrium with the ambient temperature(50℃).The curing rate of propellant is slow when the curing time is less than 1 day and more than 4 days;When the curing time is 2～4 days,the curing rate is fast.The m number of solid rocket motor has a certain impact on the temperature and curing rate of propellant in the curing process.The greater the m number,the higher the maximum temperature of propellant,and the greater the temperature difference.The temperature difference will lead to the difference in the internal curing rate of propellant grain,which will cause a delay in the curing of propellant and increase the time it takes to reach the specified curing degree.