Three-dimensional Numerical Simulation of High Temperature Airflow Impact Effect on Thermal Insulation Coating Surface
CHEN Xueye1, YANG Bin1,*, CHEN Zhi1, SU Jing2,*
1 School of Chemical Engineering, Northwest University, Xi'an 710127, China 2 Xi'an Changfeng Institute of Mechanical and Electrical, Xi'an 710065, China
Abstract: 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.
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2025, Vol. 39 
