中等压力下稀薄预混H2-Ch4火焰的湍流火焰速度和火焰特性

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Filippo Faldella, Sebastian Eisenring, Taesung Kim, Ulrich Doll, Peter Jansohn
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引用次数: 0

摘要

通过在现有的天然气燃料燃烧系统中添加越来越多的氢气,可以减少燃气轮机发电中的二氧化碳排放。为了确保安全运行,需要更多地了解H2添加如何影响湍流火焰速度和其他重要火焰特性。在燃气轮机相关条件下的高压轴向倾燃燃烧室中,研究了加氢对火焰某些特性的影响。利用OH平面激光诱导荧光(PLIF)反演火焰前缘轮廓和湍流火焰速度。结果表明,随着燃料混合物中氢气浓度的增加,湍流火焰速度和火焰特性发生了巨大变化。可以确定两种主要状态:从0到50%体积的氢气,湍流火焰速度以几乎线性的方式微弱增加,而从50%体积到100%体积,趋势急剧变化,氢气的高反应性,结合较低的刘易斯数,导致热扩散不稳定性和优先扩散效应变得越来越强,导致非常高的燃烧速率。所提出的结果有助于理解和定义相关的修改,这些修改是成功运行高H2含量燃料的燃气轮机燃烧室系统所必需的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Turbulent Flame Speed and Flame Characteristics of Lean Premixed H2-Ch4 Flames At Moderate Pressure Levels
Abstract Carbon dioxide emissions in gas turbine power generation can be reduced by adding an increasing amount of hydrogen to the existing natural gas-fueled combustion systems. To enable safe operation, more insight on how H2 addition affects turbulent flame speed and other important flame characteristics is needed. In this work, the investigation of hydrogen addition effects on certain flame properties has been carried out in a high-pressure axial-dump combustor at gas turbine relevant conditions. OH planar laser induced fluorescence (PLIF) was applied to retrieve flame front contours and turbulent flame speed. The results show that as the concentration of hydrogen in the fuel mixture increases, turbulent flame speed and flame characteristics change drastically. Two main regimes can be identified: From 0 to 50% vol. Hydrogen, the turbulent flame speed increases weakly in an almost linear fashion, while from 50% vol. to 100% vol. the trend sharply changes and the higher reactivity of hydrogen, combined with a lower Lewis number, cause thermal-diffusive instability and preferential diffusion effects to become increasingly strong, leading to very high burning rates. The presented results help to understand and to define the relevant modifications that are necessary to successfully operate gas turbine combustor systems with high H2 content fuels.
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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