Numerical investigation of the effects of pressure on NO formation characteristics for a H2/Air micromix flame

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-24 DOI:10.1016/j.ijhydene.2025.04.332

Cheng Lu , Yajin Lyu , Chang Xing , Li Liu , Penghua Qiu , Linyao Zhang

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引用次数: 0

Abstract

The present work numerically studies the effect of pressure on NO formation characteristics for a H₂/Air micromix flame. The NO emission increases as pressure increasing at high flame temperature condition (over 2300 K), which decreases as pressure increasing at low flame temperature condition (below 1800 K). In addition, NO emission has a peak value at 0.5 MPa when the flame temperature is medium (between 1800 and 2300 K). The change of pressure has slight impact on the ratio of NO from thermal route, and it reduces the ratio of NO from NNH route. However, it increases the ratio of NO from other route. Moreover, when the pressure is between 0.1 MPa and 0.5 MPa, the change of flame temperature dominates the generation of NO emission. When the pressure is in the range of 0.5 MPa–2.0 MPa, the change of radical concentration (OH, H, O et al.) dominates the generation of NO emission. In general, the increase of pressure obviously promotes the consumption of H in middle and low flame temperature zone, and the consumption of H in high flame temperature zone reduces.

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压力对H2/Air微混合火焰NO形成特性影响的数值研究

本文通过数值模拟研究了压力对H2/Air微混合火焰NO形成特性的影响。在高火焰温度条件下（超过2300 K）， NO排放量随压力的增加而增加，在低火焰温度条件下（低于1800 K）， NO排放量随压力的增加而减少，并且在火焰温度为中等（1800 ~ 2300 K）时，NO排放量在0.5 MPa处达到峰值，压力的变化对热路NO的比例影响较小，降低了NNH路NO的比例。但增加了其他途径NO的比例。当压力在0.1 MPa ~ 0.5 MPa之间时，火焰温度的变化主导着NO排放的产生。当压力在0.5 MPa - 2.0 MPa范围内时，自由基浓度（OH、H、O等）的变化主导着NO排放的产生。总的来说，压力的增加明显促进了中、低火焰温区H的消耗，高火焰温区H的消耗减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.