Frequency Domain Predictions of Acoustic Wave Propagation and Losses in a Swirl Burner With Linearized Navier-Stokes Equations
Frequency Domain Predictions of Acoustic Wave Propagation and Losses in a Swirl Burner With Linearized Navier-Stokes Equations
复制标题
使用线性纳维-斯托克斯方程对旋流燃烧器中的声波传播和损耗进行频域预测
DOI：
10.1115/gt2015-42723
复制
发表时间：
2015
影响因子：
4.1
通讯作者：
T. Sattelmayer
中科院分区：
文献类型：
--
作者：
M. Zahn;M. Schulze;C. Hirsch;M. Betz;T. Sattelmayer
采用低成本、高质量的CFD/CAA混合方法预测旋流燃烧器的声学特性，包括其复杂的旋流条件。数值计算确定的燃烧器传递矩阵对实验数据进行了验证。结果表明，这种低成本的混合方法的能力，以预测具有高几何复杂性的燃烧室部件的声学特性。最重要的是，它捕捉到了平均流量对波动场的影响。这导致声能的损失，从而构成声阻尼源。在这方面，可以以相对低的计算成本获得可靠的数据来表征复杂的声学分量。因此，可以减少通常需要提供数据的实验工作，例如建立低阶网络模型。对波动量领域的洞察允许分析线性声阻尼现象。基本上，在等熵条件下，由于涡度扰动的形成，声能损失。在复杂旋流的流动分离边缘和多剪切层内识别涡度扰动的源区。Copyright © 2015 by ASME
A low-cost, high-quality hybrid CFD/CAA-methodology is used to predict the acoustic properties of a swirl burner including its complex swirl flow conditions. The numerically determined burner transfer matrix is validated against experimental data. The results demonstrate the capability of this low-cost hybrid approach to predict the acoustic characteristics of combustor components with high geometrical complexity. Most importantly it captures the effect of mean flow quantities on the fluctuating field. This causes the loss of acoustic energy and thus constitutes sources of acoustic damping. In this regard, reliable data can be obtained to characterize complex acoustic components at relatively low computational cost. Therefore, experimental efforts can be reduced which are generally required to provide data e.g. to set up low-order network models.The insight into the field of fluctuating quantities allows the analysis of linear acoustic damping phenomena. Essentially, in the context of isentropic conditions acoustic energy is lost due to the formation of vorticity disturbances. Source regions for vorticity disturbances are identified at flow separation edges and within the multiple shear layers of the complex swirl flow.Copyright © 2015 by ASME