New Paradigms for Inverse Heat Conduction Problems: Creative analytics and experiments utilizing advanced technologies

该项目允许系统地研究由于恶劣的热环境而难以捉摸和难以解决的问题。这些条件出现在高速飞行、燃烧、材料加工、飞机和自动刹车、化学和能源过程、火灾研究、地球物理科学以及国防和国家安全应用中。这些应用使得解释感兴趣的工程量所需的地面仪器变得困难。因此，田纳西大学诺克斯维尔分校正在开发的方法允许对恶劣环境引起的表面温度和热流进行深入或背面分析。所提出的方法既具有变革性，又对其他工程领域具有自然更广泛的影响，因为它代表了一种新的范例。将进行计算和实验研究，以表明该方法和新设计的小样本测试设备的优点。此外，研究结果将纳入本科和研究生课程，以提高创造性解决问题的能力。将编制短期课程和讲习班，以便在各大学进行介绍；会议;并提供给感兴趣的行业，以确保国际竞争优势。该项目为解决适用于经典（需要参数）和校准（无参数）公式的逆热传导问题提供了变革性的分析概念和新的实验发展。在标定试验台大厦进行了基于组件验证的实验设计。随着应用程序变得越来越极端，从而产生了仪器噩梦，逆分析受到了极大的关注。高温和高热流密度的应用会严重损坏地面仪器，使其对未来的解释无用或不可靠。在这种情况下，可靠的地面评估是了解实际情况的基础。该项目促进了需要实验验证的线性和非线性研究的新公式的发展。实验验证是基于开发一个小样本，开放架构的测试设施，允许空气，惰性气体和光真空条件下使用最新的仪器和热源。将设计、制造和测试适用于航空航天和机械工程社区的基准质量测试设施。新型高温高热流率电加热器是基本的加热元件。这些加热器由氮化铝和钨线组成，与RTD完全集成。装在一个薄包装里。可以开始仔细的部件研究，以准确地量化设计配置中的热通量。在系统校准期间，将薄膜热电偶粘附在测试样品上，以估计表面温度。前面的条件，即表面温度和热流密度，将交替使用脉冲回波超声换能器来测量往返时间。传统的逆热传导是基于深度仪器的可用性，需要热物理和几何性质的规范；还有，传感器特性。热物理性质和传感器特性的量化是昂贵的，需要大量的时间和精力。从对校准视图的理解中获得的见解可以用于改进经典的逆方法。在内部，如果测试设备可以设计为交钥匙结果，则校准可以降低成本和时间延迟。将声学仪器集成到校准方法中是一种新颖的方法，它将基于对侧测量得出准确的表面温度和净热流预测。

This project allows for the systematic investigation of problems that are highly elusive and difficult to solve owing to harsh thermal environments. These conditions appear in high-speed flight, combustion, material processing, airplane and automatic brakes, chemical and energy processes, fire research, geophysical sciences, and defense and national security applications. These applications render a difficult situation for surface instrumentation needed for interpreting engineering quantities of interest. As such, the methods under development at the University of Tennessee, Knoxville allow for in-depth or backside analyzes to be performed rendering the surface temperature and heat flux caused by the harsh environment. The proposed approach is both transformative and possesses a natural broader impact to other areas of engineering as it represents a new paradigm. Both computational and experimental studies will be performed indicating the merit of the methodology and a newly designed small sample test facility. Further, the research findings will be incorporated into undergraduate and graduate courses for enhancing creative problem solving. A short-course and workshop will be developed for presentation at universities; conferences; and, available to interested industries for assuring an international competitive edge.This project offers transformative analytical concepts and novel experimental developments for resolving inverse heat conduction problems applicable to both classical (parameters required) and calibration (parameter free) formulations. Experiments are designed based on component validation in the edifice of calibration test facility. Inverse analysis is receiving significant attention as applications are becoming extreme and thus creating instrumentation nightmares. High temperature and high heat flux applications can significantly damage surface instrumentation rendering it either useless or unreliable for future interpretation. Such situations arise where reliable surface assessments are fundamental to understanding the physical situation. This project promotes the development of new formulations for both linear and nonlinear studies that require experimental verification. Experimental verification is based on developing a small sample, open architecture test facility that allows for air, inert gas and light vacuum conditions using the latest instrumentation and heating sources. A benchmark quality test facility will be designed, fabricated and tested applicable to the aerospace and mechanical engineering communities. New high temperature and high heat flux electrical heaters represent the fundamental heating element. These heaters are composed of aluminum nitride with tungsten traces that are fully integrated with RTD?s in a thin package. Careful component studies can be initiated to accurately quantify the heat flux in a designed configuration. Thin film thermocouples will be adhered to the test specimen for estimating the surface temperature during the system calibration. The front condition, i.e., surface temperature and heat flux, will alternatively be estimated using a pulse-echo ultrasonic transducer for measuring round-trip time. Conventional inverse heat conduction is predicated on the availability of in-depth instrumentation and requires the specification of thermophysical and geometrical properties; and, sensor characteristics. Quantification of thermophysical properties and sensor characteristics is costly and requires a significant time effort. Insight gained from understanding a calibration view can be applied for improving classical inverse methods. In-house, calibration reduces costs and time delays if a test facility can be designed for turn-key results. Integrating acoustic instrumentation into the calibration approach is novel and will lead to accurate surface temperature and net heat flux predictions based on an opposing-side measurement.