In order to investigate the pintle nozzle erosion characteristics in Solid Rocket orbit-control Motors,the reactions of oxidizing components such as H2O,CO2and OH with the wall of the nozzle were considered,based on the thermochemical erosion theory.Through fully coupled fluid-solid analysis using the commercial code FLUENT,this paper got temperature and erosion rate distribution,analyzed the theoretical basis of temperature distribution rules and the influences of chamber pressure and oxidizing components.The calculated results indicate that the erosion rate of nozzle wall and pintle wall both follows the trend exhibited by the heat flux distribution,and peaks slightly upstream of the throat.The head of the pintle exists a high temperature and pressure zone,and it results in higher temperature and erosion rate.The erosion rate increases with the increase of chamber pressure.H2O is the dominant oxidizing component in dictating nozzle erosion.%在热化学烧蚀理论的基础上综合考虑了H2O、CO2以及OH等氧化性组分与喷管壁面的反应,由FLUENT流体计算软件进行了流固耦合传热烧蚀计算,得到了喷管及阀杆壁面瞬态温度分布规律与烧蚀率分布规律,分析了温度分布规律的理论基础以及燃烧室压强和氧化性组分对烧蚀率的影响规律.结果表明:喷管壁面与阀杆壁面温度与烧蚀率分布均遵循壁面热流密度分布规律,在喉部上游入口处达到峰值;阀杆头部位置存在高温高压的回流区,导致该区域的温度与烧蚀率较高;烧蚀率随燃烧室压强的增大而增大;H2O是决定烧蚀的主要氧化性组分.
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