Swirl-stabilized burner for premixed and spray combustion

所要求的设备是一个涡流稳定燃烧器，它将能够作为一个精益预混燃烧器和一个使用液体燃料喷雾的燃烧器运行。稀薄预混燃烧器极易受到燃烧不稳定性的影响，这是由热释放波动和燃烧室声学之间的耦合引起的。热声不稳定性是限制未来燃气涡轮发动机进步的最具挑战性和最不为人所知的现象之一。在非常一般的意义上，对可压缩气体的任何扰动都可以由三种波构成：声波、涡量和熵。使用所要求的燃烧器进行研究的第一个目标是了解控制火焰动力学的物理过程。所要求设备的实验目标将集中在热声不稳定性基本机制的基础上，以便开发必要的工具来预测这些不稳定性发生的条件。从生物量生产的可再生燃料预计将在近期和中期占燃料原料的更大比例。增加生物燃料的生产和使用不仅有利于环境，而且有助于能源安全和经济增长。然而，关于液体生物燃料用于燃气轮机的燃烧性能的研究很少。因此，使用所要求的燃烧器进行的研究的第二个目标是在复制燃气轮机燃烧器典型特征的常压燃烧器中分离燃料成分和流体动力学对不同液体常规和生物燃料排放的影响。所要求的燃烧器还将导致产生基准数据集，这些数据集将用作指导这些燃烧现象的数值研究的重点。特别是，需要新的、高效的、准确的燃烧模型来预测现有燃气涡轮发动机设计对排放的影响，以及设计使用替代生物燃料的下一代低排放、高能效燃气涡轮发动机。

The requested equipment is a swirl-stabilized burner that will be capable of operating as a lean premixed combustor as well as a combustor employing a liquid fuel spray. Lean premixed combustors are highly susceptible to combustion instabilities, caused by the coupling between heat release fluctuations and combustor acoustics. Thermoacoustic instability represents one of the most challenging and least understood phenomena limiting the advancement of future gas turbine engines. In a very general sense, any disturbance of a compressible gas can be constituted of three types of waves: acoustic, vorticity, and entropy. The first objective of the research to be conducted using the requested burner is understand the physical processes that control the flame dynamics. The experiments targeted for the requested equipment will focus on the underpinnings of the basic mechanisms of thermoacoustic instability so that necessary tools could be developed to predict the conditions under which these instabilities occur. Renewable fuels produced from biomass are expected to constitute a greater portion of the fuel feedstock in the near to midterm. Increased production and use of biofuels will not only benefit the environment but also contribute to the energy security and economic growth. However, there are only a few studies on combustion performance of liquid biofuels for gas turbine applications. Thus, the second objective of the research to be conducted using the requested burner is to isolate the effects of fuel composition and fluid dynamics on emissions from different liquid conventional and biofuels in an atmospheric pressure burner replicating typical features of a gas turbine combustor. The requested burner will also lead to the generation of benchmark sets of data which will be used as a focus for guiding numerical studies of these combustion phenomena. In particular, new, efficient, and accurate combustion models are needed for predicting both the impact on emissions from existing gas turbine engine designs and for designing next-generation, low-emissions, high-fuel-efficient gas turbine engines burning alternative bio-fuels.