高超声速飞行器受热面高温变形光学测量技术研究和测量系统研制

During the research and development of hypersonic vehicle, a lot of static, dynamic aerodynamic heating testing and thermal-loading conjunction testing must be performed to ensure its safety and reliability, in which several critical mechanical quantities, such as thermal stress, thermal strain and structural expansion, must be accurately measured. This project aims to establish a high-temperature displacement/strain measurement system for the directly-heated surface of hypersonic vehicles, which are generally heated by quartz-lamp-array-based infrared radiation heating technology. This project will refine the non-contacting active image digital image correlation method recently developed for full-field high-temperature strain measurement. The project will focus on developing effective techniques for solving the challenging issues existed in extreme harsh environment consisting of the quartz lamp array light interference, the thermal radiation of the hot object, the test sample surface oxidation and hot air refractive index inhomogeneity in the imaging optical path. Research results of this project are expected to be inspected and applied in the hypersonic aircraft research projects assumed in the applicants' laboratory. The project not only has extremely important engineering application potentials in aerospace field, but also has an important academic significance in the research of experimental mechanics at extreme environment.

高超声速飞行器材料、结构在设计和研制阶段进行静、动态气动热环境模拟试验和热-载联合强度试验时，直接受热面热应力、热变形、结构膨胀量等基本力学量是其安全设计和可靠性评价的重要依据。针对航空航天领域高超声速飞行器受热面全场高温变形测量这一迫切需要取得突破的重要测试技术，本项目拟研制基于石英灯红外辐射加热技术的高超声速飞行器受热面高温变形光学测量系统，发展基于"主动成像"数字图像相关方法的高温变形测量技术，着重解决石英灯阵列强光干扰、高温物体热辐射、被测试样表面局部氧化以及成像光路中热空气折射率不均匀波动等恶劣条件并存的极端恶劣测量环境下，高超声速飞行器受热面全场力/热变形的非接触、高精度光学测量问题。本项目研究成果可在本实验室正在承担的高超声速飞行器研究工作中得到检验和应用，预期研究成果不仅在航空航天领域具有极其重要的军事应用价值，对极端环境实验力学方法研究也具有重要的学术意义。

高超声速飞行器材料、结构在设计和研制阶段进行静、动态气动热环境模拟试验和热-载联合强度试验时，直接受热面热应力、热变形、结构膨胀量等基本力学量的测量是其结构安全设计和可靠性评价的重要依据。针对航空航天领域高超声速飞行器受热面全场高温变形测量这一迫切需要取得突破的重要测试技术，本项目研制了基于石英灯红外辐射加热技术的高超声速飞行器受热面高温变形光学测量系统，发展了基于高亮度单色光照明和窄带通滤波成像相结合的“主动成像”数字图像相关测量技术用于高温变形测量，有效解决了石英灯阵列强光干扰、高温物体热辐射、被测试样表面局部氧化以及成像光路中热空气折射率不均匀波动等恶劣条件并存的极端恶劣测量环境下高超声速飞行器受热面全场力/热变形的非接触光学测量问题。所研制的高温应变测量光测系统已成功用于C/SiC编织复合材料和蜂窝合金板结构的全场高温热变形测量，并在我国航天部门的高超声速飞行器设计和研制过程的风洞考核验证试验中获得了成功应用。本项目研究成果不仅在航空航天领域具有极其重要的军事应用价值，对极端环境实验力学方法研究也具有重要的学术意义。