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

该项目允许系统地调查由于恶劣的热环境而非常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处于困难的境地。因此，诺克斯维尔的田纳西大学正在开发的方法允许进行深入或背面分析，从而呈现由恶劣环境引起的表面温度和热通量。 所提出的方法是变革性的，并拥有一个自然的更广泛的影响，工程的其他领域，因为它代表了一个新的范例。计算和实验研究将表明的方法和新设计的小样本测试设施的优点。此外，研究结果将纳入本科生和研究生课程，以提高创造性解决问题的能力。将开发短期课程和讲习班，在大学、会议上进行演示，并提供给感兴趣的行业，以确保国际竞争优势。该项目提供了变革性的分析概念和新颖的实验发展，用于解决适用于经典（需要参数）和校准（无参数）公式的逆热传导问题。在建立校准测试设备的基础上，设计了基于组件验证的实验。 逆分析正受到极大的关注，因为应用变得极端，从而产生仪器的噩梦。 高温和高热通量应用会严重损坏地面仪器，使其对未来的解释变得无用或不可靠。出现这种情况时，可靠的表面评估是了解物理情况的基础。 该项目促进了需要实验验证的线性和非线性研究的新配方的开发。实验验证是基于开发一个小样本，开放式结构的测试设施，允许空气，惰性气体和轻真空条件下使用最新的仪器和加热源。将设计、制造和测试适用于航空航天和机械工程界的基准质量测试设施。新的高温和高热通量电加热器代表了基本的加热元件。这些加热器是由氮化铝与钨的痕迹，是完全集成与RTD？It’包装很薄。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。薄膜热电偶将粘附在试样上，用于在系统校准期间估计表面温度。前面的条件，即，表面温度和热通量将可选择地使用用于测量往返时间的脉冲回波超声换能器来估计。传统的逆热传导是基于深度仪器的可用性，需要热物理和几何特性的规范;以及传感器特性。热物理性质和传感器特性的量化是昂贵的，并且需要大量的时间努力。 从理解校准视图中获得的见解可以应用于改进经典的逆方法。如果测试设施可以设计用于交钥匙结果，则内部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新颖的，并且将导致基于对侧测量的准确的表面温度和净热通量预测。

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.