### 旋转爆震燃烧室梯度复合热防护结构热分析模型及验证

1. 南京航空航天大学 能源与动力学院 航空飞行器热管理与能量利用工信部重点实验室, 南京 210016
• 收稿日期:2021-01-15 修回日期:2021-02-09 出版日期:2022-03-15 发布日期:2021-04-29
• 通讯作者: 张靖周 E-mail:zhangjz@nuaa.edu.cn
• 基金资助:
国家级项目

### Thermal analysis model and validation for graded-composite thermal protection structure of rotating detonation combustor

TIAN Jia, ZHANG Jingzhou, TAN Xiaoming, WANG Yuanshuai

1. Key Laboratory of Thermal Management and Energy Utilization, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
• Received:2021-01-15 Revised:2021-02-09 Online:2022-03-15 Published:2021-04-29
• Supported by:
National Project

Abstract: A graded-composite thermal protection structure composed of a SiC ablative layer, a high-silicon-oxygen ablation layer, an aerogels thermal insulation layer and a stainless-steel metal-based layer is proposed to meet the requirement of thermal protection on the high-heat-flux wall of rotating detonation combustors.A one-dimensional transient multi-layer thermal analysis model considering the ablation process is established.In combination with the typical thermal conditions of rotating detonation combustors and using the moving boundary implicit difference calculation scheme, we analyze the influences of input heat fluxes and main thermo-physical parameters of the high-silicon-oxygen ablation layer on temperature distribution of the graded-composite thermal protection structure.Furthermore, a thermal evaluation experiment is conducted for the specific graded-composite thermal protection structure on a rotating detonation combustor to validate the one-dimensional transient multi-layer thermal analysis model.It is revealed that the temperature distribution on the rotating detonation combustor wall exhibits an inherent un-uniformity along the axial direction.The front wall is effectively cooled because of the timely supplement of the premixed gas, and the peak temperature occurs in a specific region between the middle section and the combustor outlet.From the measured temperature distribution along the axial direction, the time-averaged thermal load distribution on the rotating detonation combustor wall is retrieved based on one-dimension radial heat transfer simplicity.With the retrieved thermal load, the temperature variation with time at a specific axial location is calculated and compared with the measured results.The comparison proves that the present one-dimensional transient multi-layer thermal analysis model with the integrity of the ablation process is able to provide a better prediction for temperature distribution on the graded-composite thermal protection structure.