Experimental study on flame structure, stability, and emission characteristics of CH4-H2 swirl-induced inverse diffusion flame

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-17 DOI:10.1016/j.csite.2025.106342

Yuseon Jeon , Man Young Kim , Heejung Jung , Seungro Lee

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引用次数: 0

Abstract

Inverse Diffusion Flame (IDF) is a flame with a central oxidizer jet surrounded by an annular fuel jet. In this study, a swirler was inserted into the oxidizer nozzle to increase the mixing intensity. The combustion and emission characteristics of the swirl-induced IDF (S-IDF) were investigated and compared with those of non-swirl IDF (N-IDF). The flame behavior, mixing, and radical distribution were visualized to compare the combustion characteristics of the S-IDFs and N-IDFs. The flame stabilities were evaluated by measuring the blow-out and the emission characteristics were examined by measuring the NOx and CO emissions. Although the S-IDF had 90 % lower blow-out limits than N-IDF due to curtain effect induced by swirling radial flow near fuel nozzle, S-IDF showed cleaner emission performance by reducing the maximum 88 % of CO emission. Here, hydrogen addition was suggested to enhance the operating range of S-IDF while maintaining clean emissions. The hydrogen-added S-IDF (50 vol% of hydrogen addition) showed 7.5 times higher blow-out limits and 69 % lower CO emission than methane S-IDF. Based on these findings, it was confirmed that S- IDF showed a cleaner emission performance by reducing CO emission, and inferior operation range can be supported by adding hydrogen as a fuel.

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CH4-H2旋流反扩散火焰结构、稳定性及发射特性实验研究

逆扩散火焰（IDF）是一种中心氧化剂射流被环形燃料射流包围的火焰。在氧化喷嘴中插入旋流器以提高混合强度。研究了旋流诱导IDF （S-IDF）的燃烧和排放特性，并与非旋流诱导IDF （N-IDF）进行了比较。通过火焰行为、混合和自由基分布的可视化来比较S-IDFs和N-IDFs的燃烧特性。通过测量喷爆量来评价火焰稳定性，通过测量NOx和CO排放量来考察其排放特性。尽管S-IDF由于燃料喷嘴附近旋转径向流产生的幕效应，其排气极限比N-IDF低90%，但S-IDF的排放性能更清洁，最大减少了88%的CO排放。在此，建议加氢以提高S-IDF的工作范围，同时保持清洁排放。加氢S-IDF（加氢量为50 vol%）比甲烷S-IDF的排气极限高7.5倍，CO排放量降低69%。综上所述，S- IDF通过降低CO排放而具有更清洁的排放性能，并且可以通过添加氢作为燃料来支持较差的工作范围。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.