Simultaneous 10 kHz PIV/OH-PLIF/chemiluminescence and conjoint data analysis approach for thermoacoustic oscillation near lean blowout

IF 5 Q2 ENERGY & FUELS
Zhen Cao , Wenbei Liu , Xin Yu , Bin Hu , Jiangbo Peng , PengHua Qiu , Chaobo Yang
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Abstract

Simultaneous multi-parameter experimental data characterizing the flow-combustion interaction process are of great significance for understanding the flame instability mechanism in combustion systems. In this study, we present simultaneous high-speed particle image velocimetry (PIV), OH planar laser-induced fluorescence (OH-PLIF), chemiluminescence, and acoustic pressure measurements of lean blowout (LBO) flames contained within a dual swirl-stabilized combustor to analyze the thermal-fluid-acoustic multi-field coupling process. The instability transition behavior and generation process of thermoacoustic oscillations near-LBO are experimentally investigated and analyzed. We identify two unstable swirling flame conditions, the transition and near-LBO, based on the dynamic behaviors of the dual flames, with significant thermoacoustic instability characteristics observed near 570 Hz through microphone measurements. Additionally, we investigate the spatiotemporal evolution of heat release and flow structure oscillations using spectral proper orthogonal decomposition (SPOD). As the flame approaches LBO, the axial vibration mode becomes predominant in both heat release and flow oscillation processes, with flow instability primarily concentrated in the flame arm zone. A joint analysis of SPOD data from PIV and chemiluminescence reveals an in-phase coupling between the flow field and heat release fluctuations, providing direct evidence of the triggering mechanism for thermoacoustic oscillations near LBO. Furthermore, the time-frequency analysis results illustrate the chronological sequence and causality between acoustic oscillations and heat release fluctuations during the LBO process.
同时10 kHz PIV/OH-PLIF/化学发光和联合数据分析方法的热声振荡近倾斜井喷
同时获得表征流动-燃烧相互作用过程的多参数实验数据,对理解燃烧系统中火焰不稳定机理具有重要意义。在这项研究中,我们同时采用高速粒子图像测速(PIV)、OH平面激光诱导荧光(OH- plif)、化学发光和声压测量来分析双旋流稳定燃烧室内的贫爆(LBO)火焰,以分析热-流-声多场耦合过程。实验研究和分析了lbo附近热声振荡的不稳定转变行为和产生过程。基于双火焰的动力学行为,我们确定了两种不稳定的旋转火焰状态,过渡和近lbo,通过麦克风测量在570 Hz附近观察到明显的热声不稳定特征。此外,我们利用光谱固有正交分解(SPOD)研究了热释放和流动结构振荡的时空演变。当火焰接近LBO时,放热和流动振荡过程均以轴向振动模式为主,流动不稳定主要集中在火焰臂区。对PIV和化学发光的SPOD数据进行联合分析,揭示了流场和放热波动之间的同相耦合,为LBO附近热声振荡的触发机制提供了直接证据。此外,时频分析结果说明了LBO过程中声振荡与放热波动之间的时间顺序和因果关系。
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CiteScore
4.20
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