Thermo-acoustic instabilities in gas turbine engines are studied to avoid engine failure. Compared to the engines with annular combustors, the can-annular combustor design should be less vulnerable to acoustic burner-to-burner interaction, since the burners are acoustically coupled only by the turbine stator stage and the plenum. However, non-negligible cross-talk between neighboring cans has been observed in measurements in such machines. This study is focused on the analysis of the acoustic interaction between the cans. Simplified two-dimensional (2D) and three-dimensional (3D) equivalent systems representing the corresponding engine alike turbine design are investigated. Thermo-acoustic instabilities are reproduced using a forced response approach. Compressible large eddy simulation based on the open source computational fluid dynamics OpenFOAM framework is used applying accurate boundary conditions for the flow and the acoustics. A study of the reflection coefficient and of the transfer function between the cans has been performed. Comparisons between 2D and 3D equivalent configurations have been evaluated.

中文翻译：

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筒形环形燃烧室中的筒体之间的热声串扰

为了避免发动机故障，研究了燃气涡轮发动机中的热声不稳定性。与具有环形燃烧器的发动机相比，由于燃烧器仅通过涡轮定子级和增压室进行声学耦合，因此，环形燃烧器的设计应不易受到燃烧器与燃烧器之间的相互作用。然而，在这种机器的测量中已经观察到相邻罐之间的串扰不可忽略。这项研究的重点是罐之间的声学​​相互作用的分析。研究了代表相应发动机类似涡轮机设计的简化的二维（2D）和三维（3D）等效系统。使用强制响应方法可以再现热声不稳定性。基于开源计算流体动力学的可压缩大涡模拟OpenFOAM框架用于为流和声学应用精确的边界条件。已经对罐之间的反射系数和传递函数进行了研究。已经评估了2D和3D等效配置之间的比较。