摘要
为保证发动机能在恶劣的环境中运行,在绝热层的设计中,绝热层的厚度将直接影响着发动机结构的稳定性,而绝热层的烧蚀预估对于绝热层厚度的合理设计非常重要。为解决固体火箭发动机三元乙丙橡胶(EPDM)绝热层烧蚀性能工程预估问题,结合固体火箭发动机内两相流动的环境特点,以热化学烧蚀三方程模型和扩散化学动力学双控制机制为基本数学模型,以炭化层表面孔隙率为耦合参数,并综合考虑气流和粒子的侵蚀效应,建立了绝热层多因素耦合烧蚀模型的控制方程。通过对控制方程的隐式求解和对绝热层温度分布以及烧蚀线、炭化线、热解线位置的综合分析,获得了两相环境下EPDM绝热层的理论炭化烧蚀率。所得烧蚀率与实验结果对比,误差小于10%,表明给出的烧蚀预估方法可用于固体火箭发动机两相环境下EPDM绝热层烧蚀工程分析。
In order to make sure that the engine can operate in harsh environments,in the design of the insulator,the thickness of the insulator will directly affect the stability of the engine structure,so the ablation prediction of the insulator is very important for the reasonable design of the insulator.For solving the engineering prediction of the ablation performance of the solid rocket motors ethylene propylene diene monomer(EPDM)insulator,this paper combines the environmental characteristics of the two-phase flow in the solid rocket engine,using the three-equations thermochemical ablation model and the dual control mechanism of the diffusion chemical dynamics as the basic mathematical model.Based on the coupled parameters of the surface porosity of the carbonized layer and considering the erosion effects of air flow and particles,the control equation of the multi-factor ablation model of the insulator was established.By implicitly solving the governing equations and comprehensively analyzing the temperature distribution of the insulator and the positions of the ablation line,the carbonization line,and the pyrolysis line,the theoretical carbonization ablation rate of the EPDM insulator in a two-phase flow environment is obtained.Compared with the measured results,the obtained ablation rate has an error less than 10%,indicating that the ablation prediction method put forward in this paper can be used for EPDM insulator ablation engineering analysis.
作者
王乐
冯喜平
陈嘉辉
卢景旭
梁群
侯晓
WANG Le;FENG Xiping;CHEN Jiahui;LU Jingxu;LIANG Qun;HOU Xiao(Science and Technology on Combustion,Internal Flow and Thermo-Structure Laboratory,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《固体火箭技术》
CAS
CSCD
北大核心
2021年第5期687-695,共9页
Journal of Solid Rocket Technology
关键词
两相流环境
EPDM绝热层
多因素耦合
烧蚀预估
two-phase flow environment
EPDM insulator
multi-factor coupled
ablation prediction
