Response Characteristics of a Laminar Premixed Flame to Acoustic Perturbations

다국어 초록 (Multilingual Abstract)

In various industrial and propulsion systems, the occurrence of thermoacoustic instability in combustors can be catastrophic. An understanding of flame response characteristics to acoustic perturbations is important for the analysis of this instability. Investigations into flame response characteristics to acoustic perturbations are necessary for acquiring the capability to predict this instability. In this study, numerical simulations of the response characteristics of a perforated-plate- stabilized lean laminar premixed methane/air flame to acoustic perturbations were performed. The premixed methane/air flame was described by a two-step global reaction mechanism, and two- dimensional axisymmetric simulations were performed by using an open-source OpenFOAM- based solver. The flame response was modeled by using a flame transfer function (FTF) related to flow velocity perturbations and total heat release rate perturbations. The FTF was obtained using the impulse and sinusoidal velocity forcing methods, respectively. The FTFs obtained from the two methods were similar to each other. The flame dynamics and the validity of the numerical method are discussed on the basis of an analysis of the flame response to acoustic perturbations.

목차 (Table of Contents)

• 1. Introduction
• 2. Numerical Method
• 3. Results
• 4. Conclusion
• References