在部分汽化煤油中同时测量OH/煤油- plif对崖体稳定火焰贫爆的实验研究

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-03-04 DOI:10.1016/j.expthermflusci.2025.111458

Guohua Wu , Xin Yu , Jiangbo Peng , Chaobo Yang , Bin Hu , Zhen Cao , Yingjie Song

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引用次数: 0

摘要

采用羟基(OH)/煤油-平面激光诱导荧光（PLIF）同步测量技术，对部分汽化煤油中崖体稳定火焰的稀爆（LBO）进行了实验研究。通过与煤油- plif的比较，OH-PLIF消除了干扰荧光。结果表明：随着LBO的接近，OH-PLIF区域逐渐减小，火焰由圆柱形过渡到圆锥形；在Z=1.5D之后，煤油- plif的强度逐渐降低。此外，随着LBO的接近，火焰表面向再循环区（RZ）移动，火焰表面密度（FSD）逐渐降低，表明RZ在LBO过程中的作用显著。最后，利用煤油- plif和OH-PLIF数据进行同步动态分解（simultaneous Dynamic Decomposition， SDD）分析，提取主导频率及其对应的空间结构。结果表明，随着杠杆收购的临近，SDD的主导频率逐渐降低。煤油- plif信号的空间结构呈现出正、负振荡强度的交替分布，而OH-PLIF信号的空间结构则逐渐向RZ集中。

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Experimental investigation of lean blow-out on bluff-body stabilized flames using simultaneous OH/kerosene-PLIF measurements in partially vapourised kerosene

Experimental investigation of the lean blow-out (LBO) on bluff-body stabilized flames in partially vapourised kerosene was conducted using simultaneous hydroxyl (OH)/kerosene- planar laser-induced fluorescence (PLIF) measurement technique. By comparing with kerosene-PLIF, interference fluorescence in OH-PLIF was eliminated. The results indicated that as the LBO was approached, the OH-PLIF region gradually decreased, and the flame transitioned from cylindrical to conical shape. Beyond Z=1.5D, the intensity of kerosene-PLIF gradually decreased. Furthermore, as the LBO was approached, the flame surface moved towards the recirculation zone (RZ), and the flame surface density (FSD) gradually decreased, indicating the significant role of RZ in the LBO process. Lastly, this study employs simultaneous kerosene-PLIF and OH-PLIF data for Simultaneous Dynamic Decomposition (SDD) analysis to extract the dominant frequencies and their corresponding spatial structures. The results indicate that as the LBO was approached, the dominant frequency of SDD gradually decreases. The spatial structure of kerosene-PLIF exhibits an alternating distribution of positive and negative oscillation intensities, while the spatial structure of OH-PLIF signals progressively concentrate in the RZ.

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.