Analysis of the stabilization mechanisms and the NOx formation pathways of a partially premixed burner operated with pure hydrogen

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Roberto Meloni , Giulia Babazzi , Luca Mazzotta , Domenico Borello
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引用次数: 0

Abstract

The need of reliable Computational Fluid Dynamics (CFD) models able to predict the performance of pure hydrogen combustion is becoming strategic for the development of new burner designs for Gas Turbine (GT) combustor. The ability to correctly assess the locations where the flame gets stabilized can also facilitate the early detection of any potential issue during the combustor operation, helping in the definition of the hardware improvements. So, in this research paper, the results of a species-transport based model applied to a partially premixed burner operated at atmospheric pressure will be presented as validation stage. This burner exhibits an attached and a lifted flame configuration depending on the flow conditions it operates with. The two test points are numerically investigated revealing an excellent agreement in terms of velocity field and heat release rate prediction compared with the experimental measurements. Lastly, the time-averaged CFD solutions are used to retrieve information for a Chemical Reactor Network (CRN) model employed to quantify the NOx emission leveraging a chemical mechanism able to consider all the possible formation pathways. It is demonstrated that the presented methodology is able to reproduce the experimental measures with high fidelity allowing to capture the relationship between flame morphology and pollutant emission formation.
纯氢部分预混燃烧器稳定化机理及NOx生成途径分析
需要可靠的计算流体动力学(CFD)模型来预测纯氢燃烧的性能,对于开发新型燃气轮机(GT)燃烧器设计具有重要意义。正确评估火焰稳定位置的能力也有助于在燃烧器运行过程中早期发现任何潜在问题,有助于确定硬件改进。因此,在本研究中,将基于物种输运的模型应用于部分预混燃烧器在大气压下运行的结果作为验证阶段。这种燃烧器表现出附着和提升的火焰结构,这取决于它的流动条件。对两个测试点进行了数值研究,结果表明,在速度场和放热率预测方面,与实验测量结果非常吻合。最后,时间平均CFD解决方案用于检索化学反应器网络(CRN)模型的信息,该模型利用能够考虑所有可能形成途径的化学机制来量化NOx排放。结果表明,所提出的方法能够以高保真度再现实验测量结果,从而能够捕捉火焰形态与污染物排放形成之间的关系。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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