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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.

固定式燃气轮机在目前的能源供应中发挥着重要作用，其重要性将在未来的能源格局中继续增长，部分原因是它们具有良好的负载灵活性和快速启动能力。由于目前对可再生能源和清洁使用化石燃料的努力，燃气轮机的燃料灵活操作，特别是氢燃料浓缩，正在成为基础研究和技术中日益重要的课题。例子包括在综合气化联合循环（IGCC）过程中使用氢气作为储能和燃烧合成气。然而，高氢组分燃料的富集导致贫固定式燃气轮机燃烧特性发生显著变化。这可能导致燃烧噪音增加，闪回，不必要的燃烧不稳定，并最终导致整机故障。在这里，特别是由氢的微分扩散引起的热扩散不稳定性，起着重要的作用，并可能导致强烈改变和细胞火焰结构，表现出局部熄灭区域。因此，本项目提案的主题是高氢含量燃料混合物的燃烧。目标是在考虑燃料灵活操作的影响下，使燃烧室湍流燃烧过程的计算机模拟成为可能。如今，这种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、微分扩散、热扩散不稳定性和湍流的复杂相互作用尚未得到充分理解。在本项目中，这些现象将通过直接数值模拟（DNS）进行研究。为此，将对不同含氢量的甲烷/氢混合物的预混湍流燃烧进行DNS实验。使用系统的分析工具，将对所得数据进行先验和后验分析，以解决一些重要问题，例如火焰结构，燃烧速度以及热扩散不稳定性对湍流的影响。工作假设是HHC燃料的燃烧可以用合适的多标量模型来描述。将根据对DNS数据的系统分析，对由此产生的未封闭条款制定适当的公式和建模。