Investigation of combustion noise generated by an open lean-premixed H2/air low-swirl flame using the hybrid LES/APE-RF framework
Investigation of combustion noise generated by an open lean-premixed H2/air low-swirl flame using the hybrid LES/APE-RF framework
复制标题
使用混合 LES/APE-RF 框架研究开放式稀薄预混氢气/空气低旋流火焰产生的燃烧噪声
DOI：
10.1016/j.combustflame.2022.112360
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发表时间：
2022
影响因子：
4.4
通讯作者：
Kurose Ryoichi
中科院分区：
文献类型：
--
作者：
Pillai Abhishek Lakshman;Inoue Shimpei;Shoji Takeshi;Tachibana Shigeru;Yokomori Takeshi;Kurose Ryoichi
采用计算流体力学/计算空气声学（CFD/CAA）混合框架对开放式稀预混氢/空气低涡流（LPHALS）湍流火焰的燃烧噪声谱进行了数值研究。在此框架下，通过大涡模拟（Large-Eddy Simulation， LES）计算火焰的反应流场，通过求解反应流声摄动方程（Acoustic Perturbation Equations for reactions Flows, APE-RF）捕获火焰产生的直接燃烧噪声。火焰结构和模拟条件与低旋流燃烧器（LSB）稳定开放式稀薄预混h2 /空气火焰的实验研究相一致。根据实验数据对LES结果进行了验证。CAA模拟能够在计算的燃烧噪声谱中预测一个明显的尖峰，类似于在测量的燃烧噪声谱中观察到的两个特征峰之一。CAA模拟预测的该谱峰频率为840hz，与实验测得的940hz的高频次谱峰频率接近。通过对混合LES/APE-RF结果的分析，发现840 Hz下的噪声产生机制是由于火焰与LSB出口下游剪切层中周期性产生的涡流结构之间的强烈相互作用引起的强烈的局部热释放率波动。此外，还分析了不同声源项产生的噪声的光谱含量和指向性，以研究它们对辐射声场的影响，从而研究开放LPHALS火焰产生的直接燃烧噪声的特性。
An open lean-premixed hydrogen/air low-swirl (LPHALS) turbulent flame exhibiting a pronounced peak in its combustion noise spectra, is investigated numerically using a hybrid Computational Fluid Dynamics/Computational Aero-Acoustics (CFD/CAA) framework. Under this framework, the reacting flow-field of the flame is computed via Large-Eddy Simulation (LES), while the direct combustion noise it produces is captured by solving the Acoustic Perturbation Equations for Reacting Flows (APE-RF). Flame configuration and simulation conditions correspond to those of an experimental study on an open lean-premixed H 2/air flame stabilized using a Low-Swirl Burner (LSB). LES results are validated against experimental data. The CAA simulation is able to predict a pronounced sharp peak in the computed combustion noise spectra, similar to one of the two characteristic peaks observed in the measured combustion noise spectra. Frequency of this spectral peak predicted by the CAA simulation is 840 Hz, which is close to that of the higher frequency secondary spectral peak at 940 Hz measured in the experiment. Upon examining the hybrid LES/APE-RF results, the noise generation mechanism at 840 Hz is found to be the intense local heat release rate fluctuations, caused by strong interaction between the flame and the periodically generated vortical flow structures in the shear layers, downstream of the LSB exit. Additionally, analysis of the spectral content and directivity of the noise generated by different acoustic source terms is performed, in order to investigate their impact on the radiated acoustic field, and hence the characteristics of direct combustion noise produced by the open LPHALS flame.
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