Insulator ablation modes in different impact conditions of alumina droplets onto wall surfaces
Insulator ablation modes in different impact conditions of alumina droplets onto wall surfaces
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DOI：
10.1016/j.actaastro.2018.10.032
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发表时间：
2018-12
影响因子：
3.5
通讯作者：
Yang Liu;Yiwen Guan;Jiang Li;Peijin Liu;Xiangyu Zhang
中科院分区：
文献类型：
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作者：
Yang Liu;Yiwen Guan;Jiang Li;Peijin Liu;Xiangyu Zhang
目前对固体火箭发动机（SRM）中不同氧化铝液滴撞击条件下绝热层烧蚀模式的了解有限。本研究采用理论分析与数值计算相结合的方法，设计了实验室规模的实验装置和超高温热流计。氧化铝液滴/绝缘子壁表面的影响特性，如侵蚀角，速度，和液滴的尺寸分布进行了讨论，使用所提出的设计产生的实验数据的基础上。根据熔滴速度阈值建立了三种烧蚀模式：弱烧蚀状态、沉积状态和强烧蚀状态。在此基础上，研究了高密度两相流条件下的换热特性，得到了不同液滴撞击方式下壁面热增量随液滴浓度、尺寸和速度变化的一般规律。最后，通过对多因素变量的讨论，分析了液滴/壁面作用下的热增量、热化学烧蚀和机械烧蚀之间的耦合关系，为建立绝热层烧蚀模型提供了依据。
Current understanding of insulator ablation modes under different alumina droplet impact conditions onto wall surfaces in solid rocket motors (SRM) is limited. This study uses theoretical analysis and numerical calculations to design a lab-scale experimental device and an ultra-high-temperature heat flow gauge. Alumina droplet/insulator wall surface impact characteristics such as erosion angle, speed, and droplets size distribution are discussed based on the resulting experimental data using the proposed design. Three ablation modes are established according to the droplet speed threshold: the weak erosion state, deposition state, and strong erosion state. On this basis, heat transfer characteristics are studied under the condition of high-density, two-phase flow and the general rules of the wall heat increment with droplet concentration, size, and velocity under different droplet/wall impact modes are obtained. Finally, discussing multi-factor variables, the coupling relationship among the thermal increment, thermal chemical ablation, and mechanical erosion under droplet/wall surface action is analysed, providing insights toward establishing an insulator ablation model.