Experimental and numerical investigation of the combustion behavior in a conical vortex combustor

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-13 DOI:10.1016/j.fuel.2024.133322

Dan Du, Jing-hao Zhang, Qiang-qiang Hao, Jing-jie Ren, Ming-shu Bi

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Abstract

In this study, we analyzed the effects of different excess air coefficients (α) and primary air ratios (φ) on the combustion process in a conical vortex combustion chamber. Experimental and simulation results revealed the significant impact of the variations in these factors on the flame shape, NO emission, and CH₄ residue in the combustor.

Three flame shapes were observed in the combustor at different air-flow rates. At 0.221 < α ≤ 1.21, outer trumpet-shaped flames formed in Case 1. At 3.57 ≤ α ≤ 10.61, the air influx through the vortex flow channel rapidly propagated to the lower part of the combustor, forming only the central flame in Case 3. At 1.21 < α < 3.57, the proper amount of air lowered the combustion temperature and increased the combustion area, and thus, outer trumpet-shaped and central flames coexisted in Case 2. In Case 2, the CH₄ residue was 0.8 % of that in Case 1, and the minimum NO emission was less than 40 ppm, providing a good balance between combustion and low-emission performance. These findings are expected to contribute to the development of a new type of combustion chamber.

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锥形涡流燃烧器燃烧行为的实验和数值研究

本研究分析了不同过量空气系数（α）和一次空气比（φ）对锥形涡流燃烧室燃烧过程的影响。实验和模拟结果表明，这些因素的变化对燃烧器中的火焰形状、NO 排放量和 CH4 残留量有显著影响。在 0.221 < α ≤ 1.21 时，情况 1 中形成了外喇叭形火焰。在 3.57 ≤ α ≤ 10.61 时，通过涡流通道流入的空气迅速向燃烧器下部扩散，在情况 3 中仅形成中心火焰。在 1.21 < α < 3.57 时，适量的空气降低了燃烧温度，增大了燃烧面积，因此在案例 2 中，喇叭形外焰和中心火焰并存。在实例 2 中，CH4 残留量为实例 1 的 0.8%，NO 排放量小于 40 ppm，在燃烧和低排放性能之间取得了良好的平衡。这些发现有望为新型燃烧室的开发做出贡献。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.