Vortex Breakdown Types and Global Modes in Swirling Combustor Flows with Axial Injection
Vortex Breakdown Types and Global Modes in Swirling Combustor Flows with Axial Injection
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DOI：
10.2514/1.b35217
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发表时间：
2015-01
影响因子：
1.9
通讯作者：
S. Terhaar;T. Reichel;C. Schrödinger;Lothar Rukes;C. Paschereit;K. Oberleithner
中科院分区：
文献类型：
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作者：
S. Terhaar;T. Reichel;C. Schrödinger;Lothar Rukes;C. Paschereit;K. Oberleithner
本文提出了一个综合的实验，数值和分析研究的不同的旋涡破裂类型和螺旋不稳定性的发生在现实的旋流燃烧室流与轴向空气喷射通过一个中心体的结果。在水洞试验装置上对燃烧室内和燃烧室上游混合管内的等温流场进行了参数化研究。在反应条件下进一步评估所选构型。其次，进行了大涡模拟，并成功地与实验数据进行了验证。等温和反应的结果表明，强烈的影响的入流参数上的涡破裂的类型和频率，振幅和形状的全球模式。对时间平均测量和模拟速度数据进行线性局部水动力稳定性分析，得出流场内部的绝对不稳定区域。轴向注射示出，以阻止绝对不稳定区…
This paper presents the results of a combined experimental, numerical, and analytical study of the occurrence of different vortex breakdown types and helical instabilities in realistic swirling combustor flows with axial air injection through a centerbody. A parametric study of the isothermal flowfield inside the combustion chamber and in the mixing tube upstream of the combustor is carried out in a water-tunnel test facility. Selected configurations were further assessed under reacting conditions. Next, a large-eddy simulation was conducted and successfully validated with the experimental data. The isothermal and reacting results show a strong effect of the inflow parameters on the type of the vortex breakdown and the frequency, amplitude, and shape of the global mode. Linear local hydrodynamic stability analyses, carried out on the time-average measured and simulated velocity data, yield the absolutely unstable domain inside the flowfield. Axial injection is shown to impede a zone of absolute instabilit...