Radiation Tools for the Determination of Temperatures and Concentrations from Radiometric Measurements in Laminar and Turbulent Combustion Systems

这项研究涉及预测和测量层流和湍流燃烧系统中的物种和/或烟尘浓度和温度。虽然光学诊断已经达到了很高的精确度，但在湍流燃烧环境中进行准确测量仍然非常困难。这些困难在很大程度上归因于湍流流场结构和相应辐射场之间的高度非线性相互作用。这些相互作用不仅使测量变得困难，而且对燃烧系统中固有的热释放和化学级联以及碳烟形成都有重要影响。这一提议试图用基本的实验、分析和计算方法来解释湍流-辐射相互作用的性质。智能优点：将开发非侵入性光谱辐射工具，主要基于视线技术，测量层流和湍流反应流中的物种浓度和温度。这些测量将用于重建感兴趣变量的分布，并指导开发和验证此类流动的理论模型。这项研究的一个独特方面是纳入了仪器的预测响应，这将被用来在配套实验中测量感兴趣的数量。这种能力减少了在测量和预测之间进行比较时的不确定性，并增加了我们对潜在物理现象的理解。该预测模型基于传输PDF方法。更广泛的影响：湍流燃烧与美国使用的大部分能源的产生和/或转换有关。相关的热传递，包括辐射热传递，被用于从发电到运输的各种应用。研究生和本科生将在PIS机构从事这项研究，这是加州大学系统的一个新组成部分。本科生将主要负责进行实验测量，让来自代表性不足群体的学生获得重要的高级研究机会。将与爱德华兹空军基地和桑迪亚国家实验室的研究人员进行合作。

0966627ModestThis research involves the prediction and measurement of species and/or soot concentrations and temperatures in laminar as well as turbulent combustion systems. Although optical diagnostics have reached high levels of refinement, it remains very difficult to make accurate measurements in turbulent combustion environments. The difficulties are largely attributable to the highly non-linear interactions between the structure of the turbulent flow field and the corresponding radiation field. Not only do these interactions make measurements difficult, they also have an important effect on both the heat release and the chemical cascading as well as soot formation that is inherent in combustion systems. This proposal seeks to explain, using fundamental experimental, analytical and computational approaches, the nature of the turbulence-radiation interaction. Intellectual Merit: Nonintrusive spectral radiation tools will be developed to measure species concentrations and temperatures in both laminar and turbulent reacting flows, based primarily on line-of-sight techniques. The measurements will be used to reconstruct the distributions of the variables of interest, and guide the development of, and validate theoretical models for such flows. One unique aspect of the research is inclusion of the predicted response of instrumentation that would be used to measure the quantities of interest in a companion experiment. This capability reduces the uncertainties in comparisons made between measurements and predictions, and increases our understanding of the underlying physical phenomena. The predictive model is based upon the transported PDF method.Broader Impacts: Turbulent combustion is associated with production and/or conversion of most of the energy used in the U.S. The associated heat transfer, including the radiation heat transfer, is utilized in applications ranging from electric power generation to transportation. Graduate and undergraduate students will be engaged in the research at the PIs institution, which is a new component of the University of California System. Undergraduate students will be primarily responsible for making the experimental measurements, giving students from underrepresented groups important exposure to advanced research. Collaboration will be made with researchers at Edwards Air Force Base and Sandia National Laboratories.