硅基内衬喷管扩张段烧蚀和温度场的耦合计算方法

A COUPLING CALCULATION METHOD FOR ABLATION AND TEMPERATURE FIELD IN A DIVERGENT NOZZLE SECTION WITH SILICA-PHENOLICS LINING

关键词:  火箭发动机喷管  烧蚀  温度分布  耦合模式  计算

Key words:  Rocket engine nozzle  Ablation  Temperature distribution  Coupledmode  Calculation

摘要:

本文叙述固体火箭喷管扩张段硅基内衬烧蚀和温度场的耦合计算方法.烧蚀采用非定常的液体层烧蚀模型;温度场计算采用圆柱坐标系下的一维径向瞬态导热模型,考虑材料在高温下形成的炭化层和热解层,而由烧蚀产生的边界移动问题用坐标变换的方法处理.利用烧蚀和导热计算方程组中二者的结合部,通过充分耦合,获得了更准确的预示计算结果.

Abstract:

This paper describes a coupling calculation method for ablation and temperature field on SPRM nozzle with silica-phenolics. A unsteady liquid layer model is considered for calculation.The temperature field is treated as one dimensional in a cylindric coordinates,transient heat-conduction problem. By using coordinates transformation, the physical plane with moving boundary resulting from ablation is turned into the rectangular coordinates calculating plane with fixed boundary.Finally, a more accurate calculation result is obtative with a full consideration of the coupling term in both ablative equation and heat-conduction equation.