Advanced radiation models to enable direct comparisons between computed and measured temperatures and compositions in laminar and turbulent flames

先进的辐射模型可以直接比较计算和测量的层流和湍流火焰中的温度和成分

• 批准号: 1604446
• 负责人: Daniel Haworth
• 金额: $ 21万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1604446&HistoricalAwards=false
• 关键词: Advanced; radiation; models; enable; direct

1604446 - HaworthCombustion will continue to play a central role in propulsion and power generation for the foreseeable future. This includes engines for light- and heavy-duty road vehicles (cars and trucks). Aggressive fuel economy and emissions targets have been established to simultaneously reduce energy consumption and pollutant emissions, including greenhouse-gas emissions. At the same time, alternatives to petroleum-derived fuels (e.g., biofuels) are being introduced to reduce the carbon footprint of combustion-based energy systems. Predictive mathematical/computational tools are urgently needed so that engineers can optimize future engines and other combustion systems for maximum performance with minimum fuel consumption and emissions, while enabling the introduction of future sustainable fuels. These tools must include accurate representations of the key underlying physical processes. Radiative heat transfer is important in combustion systems, by virtue of their high temperatures, but has received relatively little attention to date because of its extreme complexity. This project will develop advanced radiation models that will be an important part of a new generation of predictive mathematical/computational tools, which in turn will enable the introduction of a new generation of high-efficiency, low-emissions, alternative-fuel vehicles.High-resolution optical diagnostics and numerical simulations are increasingly being brought to bear to provide fundamental insight into the underlying physical processes in engines and other combustion systems, and to inform the development of reduced-order models that can be used for device and system design. However, the connection between experiment and numerical simulation/modeling remains somewhat primitive. For example, extensive simplification and modeling are required to provide quantitative values of temperature and equivalence-ratio distributions from measured radiative intensities for nonintrusive optical diagnostics techniques. At the same time, increasingly sophisticated models for spectral radiative heat transfer are being developed for computational fluid dynamics (CFD)-based simulations of turbulent reacting flows, and these models provide an ideal starting point for directly computing the radiative intensity signals that correspond to various optical diagnostics techniques. By the end of this project, two important diagnostic techniques will have been developed/advanced for applications to harsh high-pressure combustion environments such as those in piston engines, simulation models will have been extended to directly compute radiative intensity signals corresponding to these diagnostic techniques, and a proof-of-concept of the advantages of making direct comparisons between computed and measured radiative intensities (versus derived quantities, such as temperature and equivalence ratio) will have been completed.

1604446 - 在可预见的未来，HaworthCombustion 将继续在推进和发电领域发挥核心作用。这包括轻型和重型道路车辆（汽车和卡车）的发动机。制定了积极的燃油经济性和排放目标，以同时减少能源消耗和污染物排放，包括温室气体排放。与此同时，石油衍生燃料的替代品（例如生物燃料）正在被引入，以减少基于燃烧的能源系统的碳足迹。迫切需要预测数学/计算工具，以便工程师能够优化未来的发动机和其他燃烧系统，以最小的燃料消耗和排放实现最大性能，同时能够引入未来的可持续燃料。这些工具必须包括关键基础物理过程的准确表示。由于其高温，辐射传热在燃烧系统中非常重要，但由于其极其复杂，迄今为止受到的关注相对较少。该项目将开发先进的辐射模型，该模型将成为新一代预测数学/计算工具的重要组成部分，进而推动新一代高效、低排放、替代燃料汽车的推出。分辨率光学诊断和数值模拟越来越多地被用来提供对发动机和其他燃烧系统的底层物理过程的基本洞察，并为可用于设备和系统设计的降阶模型的开发提供信息。然而，实验和数值模拟/建模之间的联系仍然有些原始。例如，需要进行广泛的简化和建模，以根据非侵入式光学诊断技术测量的辐射强度提供温度和当量比分布的定量值。与此同时，越来越复杂的光谱辐射传热模型正在开发中，用于基于计算流体动力学 (CFD) 的湍流反应流模拟，这些模型为直接计算对应于各种辐射强度信号提供了理想的起点。光学诊断技术。到该项目结束时，将开发/改进两种重要的诊断技术，用于恶劣的高压燃烧环境（例如活塞发动机中的燃烧环境），仿真模型将扩展为直接计算与这些诊断技术相对应的辐射强度信号，并且将完成对计算和测量的辐射强度（与导出的量，例如温度和当量比）进行直接比较的优势的概念验证。