Simulations and Modeling of Turbulent Combustion Using Fuel Mixtures with High Hydrogen Content

使用高氢含量燃料混合物的湍流燃烧模拟和建模

基本信息

批准号：
277815585
负责人：
Professor Dr.-Ing. Heinz Pitsch
金额：
--
依托单位：
Institut für Technische Verbrennung (ITV)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/277815585?language=en
关键词：
Simulations Modeling Turbulent Combustion Using

项目摘要

Stationary gas turbines play a significant role in the present energy supply, and their importance will continue to grow in the energy landscape of the future, partly because of their good load flexibility and quick start capability. As a consequence of the present efforts for renewable energy and cleaner use of fossil fuels, fuel-flexible operation of gas turbines, and particularly fuel enrichment by hydrogen, is becoming an inceasingly important topic in fundamental research and technology. Examples include the use of hydrogen as energy storage and the combustion of syngas in the integrated gasification combined cycle (IGCC) process. However, the enrichment of fuels with high fractions of hydrogen results for lean stationary gas turbine combustion in a significant change in combustion characteristics. This can result in increased combustion noise, flashback, unwanted combustion instabilities, and eventually in complete machine failure. Here, especially thermo-diffusive instabilities, induced by differential diffusion of hydrogen, play an important role and can lead to strongly altered and cellular flame structures exhibiting locally extinguished regions. The topic of the present project proposal is therefore the combustion of fuel mixtures with high hydrogen content (HHC). The goal is to enable computer-based simulations of turbulent combustion processes in combustion chambers considering the effects found in fuel flexible operation. Such simulations nowadays are an important part of the development and optimization of gas turbines. One of the main scientific challenges for modeling is here that the complex interaction of flame structure, differential diffusion, thermo-diffusive instability, and turbulence is not yet sufficiently understood. Within this project, these phenomena shall be investigated by means of direct numerical simulations (DNS). For this, DNS will be performed for premixed turbulent combustion of methane/hydrogen mixtures with different hydrogen content. Using systematic analysis tools, the resulting data will be analyzed a priori and a posteriori to address some important questions, for example with respect to flame structure, burning rate, and the influence of thermo-diffusive instabilities on the turbulence. The working hypothesis is that the combustion of HHC fuels can be described by suitable multi-scalar models. An appropriate formulation and modeling of the resulting unclosed terms will be developed based on the systematic analysis of the DNS data.

固定的燃气轮机在目前的能源供应中起着重要作用，其重要性将在未来的能源景观中继续增长，部分原因是它们具有良好的载荷灵活性和快速的启动能力。由于目前的可再生能源和更清洁的化石燃料，燃油燃料的操作，尤其是氢气富含燃料的努力，正成为基础研究和技术的重要主题。示例包括将氢用作储能和在集成气体合并循环（IGCC）过程中的合成气的燃烧。然而，在燃烧特性的显着变化中，具有较高氢的含量高的燃料富集。这会导致燃烧噪声增加，闪回，不需要的燃烧不稳定性，并最终导致完整的机器故障。在这里，尤其是由氢的差分扩散引起的热 - 延伸不稳定性，起着重要作用，并可能导致强烈改变的细胞火焰结构，表现出局部灭绝的区域。因此，本项目建议的主题是燃料混合物具有高氢含量（HHC）的燃烧。目的是考虑到燃料柔性操作中的效果，启用燃烧室中湍流燃烧过程的基于计算机的模拟。如今，此类模拟是燃气轮机开发和优化的重要组成部分。建模的主要科学挑战之一是，火焰结构，差分扩散，热延伸不稳定和湍流的复杂相互作用尚未充分理解。在该项目中，这些现象应通过直接数值模拟（DNS）进行研究。为此，将对具有不同氢含量的甲烷/氢混合物的预混合湍流燃烧进行DNS。使用系统的分析工具，将对所得数据进行先验和后验分析，以解决一些重要的问题，例如，关于火焰结构，燃烧率以及热降低不稳定性对湍流的影响。工作假设是可以通过合适的多尺度模型来描述HHC燃料的燃烧。根据DNS数据的系统分析，将开发出适当的未锁定项的表述和建模。