Study on the acoustic disturbance characteristics of the spray flame

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-10-28 DOI:10.1016/j.tsep.2024.103016

Dongliang Wei, Hao Fang, Hao Zhou

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Abstract

The axial sound field was added to the ethanol spray flame as a perturbation element to study the dynamic response and combustion characteristics. A forced acoustic field is applied to a small oscillating flame. In cases where the frequency of the external sound field matches the eigenfrequency, even small amplitude self-excited flames demonstrate significant instability. As the intensity of the sound field increases, the amplitude of pressure oscillations sharply rises, and the pressure and flame heat release oscillations are in-phase. When the sound field operates at frequencies other than the eigenfrequency, it has an inhibitory effect on the evaporation and combustion process of ethanol droplets. Consequently, intensifying the sound field leads to a reduction in both the area of the evaporation combustion zone and the axial temperature of the flame. The CO formation is influenced by both temperature and the sound field, showing a pattern of increasing and then decreasing with the increase of sound intensity. Additionally, NOx generation exhibits higher emission concentrations in low-temperature and short flames, which is more likely to prompt NOx and is not closely related to frequency.

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喷射火焰的声学干扰特性研究

为研究动态响应和燃烧特性，在乙醇喷射火焰中加入了轴向声场作为扰动元素。在小型振荡火焰上施加了强制声场。在外部声场频率与特征频率相匹配的情况下，即使是小振幅自激火焰也会表现出明显的不稳定性。随着声场强度的增加，压力振荡的振幅急剧上升，压力和火焰放热振荡同相。当声场工作在特征频率以外的频率时，会对乙醇液滴的蒸发和燃烧过程产生抑制作用。因此，声场的增强会导致蒸发燃烧区面积和火焰轴向温度的降低。一氧化碳的形成受温度和声场的影响，随着声强的增加呈现先增加后减少的模式。此外，氮氧化物的生成在低温和短火焰中表现出更高的排放浓度，这更有可能催生氮氧化物，且与频率关系不大。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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