The management of combustion dynamics in gas turbine combustors has become more challenging as strict NOx/CO emission standards have led to engine operation in a narrow, lean regime.^1,2 While premixed or partially premixed configurations such as Lean Premixed Pre-vaporized (LPP), Rich Quench Lean burn (RQL), and Lean Direct Injection (LDI) have shown reduced NOx emissions, they promote a coupling between acoustics, hydrodynamics, and combustion that can lead to amplification of combustion instabilities.² Advancements in experimental techniques such as particle imaging velocimetry (PIV) and planar laser induced fluorescence (PLIF) at multi-kHz interrogation frequencies coupled with high frequency pressure measurements provide detailed understanding of the complex flow-field and flame dynamics. To extend the spatio-temporal capabilities of these measurements and to gain further understanding of the interaction between chamber acoustics, hydrodynamics and the flame, high-fidelity computations validated against experiments provide significant value. The validation of these models must be performed over a wide range of parameters at engine relevant conditions to capture discriminating physics and experiment trends. This paper addresses the need for experimental data that can be used to test high-fidelity simulations of the unsteady reacting flow field in model configurations specifically designed for relevant conditions. The model combustor was designed to provide quantitative measurements that could be directly compared to CFD predictions. Boundary conditions were well-defined and amenable to modeling, the combustor wall in the active flame region was coated with thermal barrier coating to approach wall boundary conditions used in the model, and a range of geometric and operating conditions were used to test the ability of the model to predict trendwise behavior.

中文翻译：

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单元素稀薄直喷燃烧室燃烧不稳定性的参数研究

由于严格的NOx / CO排放标准已导致发动机在狭窄，稀薄的条件下运行，因此燃气轮机燃烧器中燃烧动力学的管理变得更具挑战性。^1,2虽然预混合或部分预混合的配置（例如精益预混预蒸发（LPP），浓淬火精益燃烧（RQL）和精益直喷（LDI））显示减少了NOx排放，但它们促进了声学，流体动力学，和燃烧会导致燃烧不稳定性加剧。²实验技术的进步，例如在多kHz询问频率下的粒子成像测速（PIV）和平面激光诱导的荧光（PLIF），再加上高频压力测量，使人们对复杂的流场和火焰动力学有了更深入的了解。为了扩展这些测量的时空能力并进一步了解室内声学，流体动力学和火焰之间的相互作用，针对实验验证的高保真度计算提供了重要价值。这些模型的验证必须在与发动机相关的条件下，在广泛的参数范围内进行，以捕获有区别的物理学和实验趋势。本文满足了对实验数据的需求，这些实验数据可用于测试针对特定条件而专门设计的模型配置中非稳态反应流场的高保真度模拟。模型燃烧器旨在提供可以直接与CFD预测进行比较的定量测量。边界条件定义明确且易于建模，在活动火焰区域的燃烧室壁上涂有热障涂层，以逼近模型中使用的壁边界条件，并使用一系列几何和操作条件来测试该模型可以预测趋势行为。