Investigation of the Thermoacoustic Characteristics of a Lean Premixed Gas Turbine Burner
Investigation of the Thermoacoustic Characteristics of a Lean Premixed Gas Turbine Burner
复制标题
精益预混燃气轮机燃烧器热声特性研究
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
W. Polifke
中科院分区：
文献类型：
--
作者：
C. Paschereit;W. Polifke
为了模拟热声振荡，燃烧系统可以被描述为声学元件的网络，例如代表燃料和空气供应、燃烧器和火焰、燃烧器、冷却通道、合适的终端等。对于这些元件中的大多数，简单的分析模型提供了对其热声特性的充分描述。然而，燃烧器和火焰对声学扰动的复杂响应--至少在第一步--还需要通过实验来确定。在我们的方法中，我们将燃烧器描述为一个有源声学二端口，其中进出口压力和速度的状态变量通过一个四元传递矩阵耦合。这种方法类似于通信工程中的“黑箱”理论。要确定所有四个系数，必须创建两个独立的测试状态。这是通过分别使用燃烧器上游和下游的声源来实现的。在一台全尺寸燃气轮机燃烧器的应用中，首先在没有燃烧的情况下测试了该方法的准确性，并将结果与燃烧器声学特性的分析模型进行了比较。然后利用该方法确定了燃烧器的燃烧传递矩阵，并考察了声幅、当量比等参数对燃烧传递矩阵的影响。将燃烧器作为带反馈的声学二端口处理，用于模拟燃烧室的热声行为，并通过实验确定燃烧器传递矩阵，这是一种新颖的方法。
To model thermoacoustic oscillations, a combustion system can be described as a network of acoustic elements, representing for example fuel and air supply, burner and flame, combustor, cooling channels, suitable terminations, etc. For most of these elements, simple analytical models provide an adequate description of their thermoacoustic properties. However, the complex response of burner and flame to acoustic perturbations has — at least in a first step — to be determined by experiment. In our approach, we describe the burner as an active acoustical two-port, where the state variables pressure and velocity at the inlet and the outlet are coupled via a four element transfer matrix. This approach is similar to the “black box” theory in communication engineering. To determine ail four coefficients, two independent test states have to be created. This is achieved by using acoustic sources upstream and downstream of the burner, respectively. In application to a full size gas turbine burner, the method’s accuracy was tested in a first step without combustion and the results were compared to an analytical model for the burner’s acoustic properties. Then the method was used to determine the burner transfer matrix with combustion and to investigate the influence of various parameters such as acoustic amplitude and equivalence ratio. The treatment of burners as acoustic two-port with feedback used to model the thermoacoustic behavior of combustion chambers and the experimental determination of the burner transfer matrix is novel.Copyright © 1998 by ASME