A Unified Manifold-Based Approach to Modeling Turbulent Combustion

基于统一流形的湍流燃烧建模方法

• 批准号: 1839425
• 负责人: Michael Mueller
• 金额: $ 30万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1839425&HistoricalAwards=false
• 关键词: Unified; Manifold; Based; Approach; Modeling

One of the major impediments to the development of new high-efficiency low-emissions combustion systems is the lack of reliable, affordable, predictive computational models for describing turbulent combustion. The primary challenge in developing such models is describing the relationship between combustion processes and turbulence. While a broad range of models have been developed for describing the effects of turbulence on combustion processes, no general models exist for describing the effects of combustion processes on turbulence. Current turbulence models implicitly assume that combustion heat release has no effect on turbulence, a fact contrary to observation. This project will develop a new modeling approach capable of capturing the two-way coupling between combustion processes and turbulence. In the new approach, information about the combustion processes is directly embedded into the turbulence model. The new model will be evaluated against a set of computational databases and experimental databases of laboratory-scale turbulent combustion. With the two-way coupling between combustion processes and turbulence fully captured, the new modeling approach will enable truly predictive simulations of turbulent combustion, facilitating the development of new clean combustion systems. The software implementation of the new modeling approach will also be made publicly available for use by other researchers and in industry.Despite the known influences of combustion heat release on turbulence, notably the phenomenon of counter-gradient-transport, turbulence models in reacting flows are usually adapted from the non-reacting flow community, implicitly assuming no effect of combustion heat release on turbulence. This project will develop a fundamentally new approach for Large Eddy Simulation (LES) of turbulent combustion that accounts for fully coupled interactions between turbulence and combustion. The approach relies on the conditional filtering of not only the thermochemical scalar equations but also the momentum equation with respect to one or more flame structure variables. With this approach, the modeling of turbulence is divorced from the flame dynamics, which are embedded into the conditional filtering, and simplifies closure modeling. After deriving the conditionally filtered governing equations and analyzing their budgets using data from Direct Numerical Simulation (DNS), closure models will be developed using a combination of physics-based approaches and data-based approaches. Ultimately, the unified manifold-based approach will be implemented into a computational tool, benchmarked against current modeling approaches, and validated against experimental measurements of turbulent premixed and stratified flames.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

开发新型高效低排放燃烧系统的主要障碍之一是缺乏可靠的、可负担的、用于描述湍流燃烧的预测计算模型。发展这种模型的主要挑战是描述燃烧过程和湍流之间的关系。虽然已经开发了广泛的模型来描述湍流对燃烧过程的影响，但是还没有通用的模型来描述燃烧过程对湍流的影响。目前的湍流模型隐含地假设燃烧放热对湍流没有影响，这与观察相反。该项目将开发一种新的建模方法，能够捕捉燃烧过程和湍流之间的双向耦合。在新方法中，燃烧过程的信息直接嵌入到湍流模型中。新模型将根据一组实验室规模的湍流燃烧的计算数据库和实验数据库进行评估。随着燃烧过程和湍流之间的双向耦合被完全捕获，新的建模方法将能够对湍流燃烧进行真正的预测模拟，从而促进新的清洁燃烧系统的开发。新的建模方法的软件实现也将公开提供给其他研究人员和工业界使用。尽管已知燃烧热释放对湍流的影响，特别是反梯度传输现象，反应流中的湍流模型通常是从非反应流社区改编的，隐含地假设燃烧热释放对湍流没有影响。该项目将为湍流燃烧的大涡模拟（LES）开发一种全新的方法，该方法考虑了湍流和燃烧之间的完全耦合相互作用。该方法不仅依赖于热化学标量方程的条件滤波，而且依赖于相对于一个或多个火焰结构变量的动量方程。该方法将湍流模型与火焰动力学模型分离，并将其嵌入到条件滤波中，简化了闭合模型。在推导出有条件过滤的控制方程并使用直接数值模拟（DNS）的数据分析其预算后，将使用基于物理的方法和基于数据的方法相结合来开发闭合模型。最终，统一的基于歧管的方法将被实施到一个计算工具，基准对当前的建模方法，并验证对湍流预混合和分层flames.This奖项的实验测量反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

Closure modeling for the conditional Reynolds stresses in turbulent premixed combustion

湍流预混燃烧中条件雷诺应力的闭合建模

• DOI: 10.1016/j.proci.2020.07.046
• 发表时间: 2021
• 期刊: Proceedings of the Combustion Institute
• 影响因子: 3.4
• 作者: Lee, Jinyoung;Mueller, Michael E.
• 通讯作者: Mueller, Michael E.

Damköhler number scaling of active cascade effects in turbulent premixed combustion

湍流预混燃烧中主动级联效应的 Damköhler 数标度

• DOI: 10.1063/5.0039119
• 发表时间: 2021
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: MacArt, Jonathan F.;Mueller, Michael E.
• 通讯作者: Mueller, Michael E.

Heat release effects on the Reynolds stress budgets in turbulent premixed jet flames at low and high Karlovitz numbers

• DOI: 10.1016/j.combustflame.2020.02.014
• 发表时间: 2020-06-01
• 期刊: COMBUSTION AND FLAME
• 影响因子: 4.4
• 作者: Lee, Jinyoung;MacArt, Jonathan F.;Mueller, Michael E.
• 通讯作者: Mueller, Michael E.