摘要
在实际飞行器复杂的气动环境中,涂层不仅受到气流摩擦产生的高温烧蚀,还受到高速大气的冲击作用,这使得动态气流冲击对涂层隔热效果及表层损伤的影响与静态过程有显著差异。基于FLUENT软件对不同倾角的隔热涂层的高温气流冲击过程进行了数值模拟,分析了高速高温燃气冲击下涂层和钢板基底的温度和应力变化。研究表明,涂层的隔热效果与其倾角紧密相关,其中倾角为45°时,涂层和钢板的表面平均温差最大,隔热效果最佳。应力分析表明,随着倾角增大,试件表面的平均压应力显著增加,倾角为90°时的平均压应力是30°时的6.72倍,高压应力区域向上侧扩散并占据大部分区域,可能对涂层的黏附性能产生破坏。同时,涂层表面的剪应力分布与压应力相反,虽然数值较小,但是对涂层的破坏作用不可忽视,尤其是在较小倾角下表现得更加明显。
In the complex aerodynamic environment of actual aircraft,the coating is subjected to a combination of high-temperature ablation generated by airflow friction and the impact effect of high-speed atmosphere.This makes the effect of dynamic airflow impact on the coating’s thermal insulation effect and surface damage significantly different from the static process.In this work,FLUENT is used to simulate the thermal insulation coating with different inclination angles in the process of high-temperature gas impact,and analyze the temperature and stress changes of the coating and steel plate substrate under the impact of high-speed and high-temperature gas.It is found that the thermal insulation effect of the coating is closely related to its inclination angle,in which the average temperature difference between the surface of the coating and the steel plate is the largest and the thermal insulation effect is the best when the inclination angle is 45°.Stress analysis shows that the average compressive stress on the surface of the specimen increases significantly with the increase of inclination angle,and the compressive stress at 90°inclination angle is 5.72 times higher than that at 30°,and the high-pressure stress region spreads to the upper side and occupies most of the area,which may damage the adhesion performance of the coating.Meanwhile,the distribution of shear stress on the surface of the coating is opposite to the compressive stress,although the value is small,the damaging effect on the coating cannot be neglected,especially at lower inclination angle,which is more obvious.
作者
陈学烨
杨斌
陈志
苏菁
CHEN Xueye;YANG Bin;CHEN Zhi;SU Jing(School of Chemical Engineering,Northwest University,Xi’an 710127,China;Xi’an Changfeng Institute of Mechanical and Electrical,Xi’an 710065,China)
出处
《材料导报》
北大核心
2025年第18期228-233,共6页
Materials Reports
基金
陕西省重点研发计划项目(2021GY-150)
陕西省重点科技创新团队项目(2022TD-33)。
关键词
隔热涂层
高温气流
动态冲击
热力学过程
数值模拟
thermal insulation coating
high temperature airflow
dynamic impact
thermodynamics process
numerical simulation
作者简介
陈学烨,西北大学化工学院硕士研究生,在杨斌教授的指导下进行研究。目前主要研究领域为流体力学、化工过程机械;通信作者:杨斌,博士,西北大学化工学院教授、硕士研究生导师。目前主要从事环境流体力学、多相流、过程流体机械及装置等方面的研究,binyang@nwu.edu.cn;通信作者:苏菁,硕士,西安长峰机电研究所高级工程师。目前主要从事耐高温抗烧蚀复合材料等方面的研究,wormcat007@163.com。
