Swirl-stabilized burner for premixed and spray combustion

所要求的设备是一个旋流稳定燃烧器，它将能够作为一个贫油预混燃烧室以及燃烧室采用液体燃料喷雾。贫油预混燃烧室对燃烧不稳定性非常敏感，这是由放热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机发展的最具挑战性和最难理解的现象之一。一般来说，可压缩气体的任何扰动都可以由三种波组成：声波、涡量波和熵波。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。针对所要求的设备进行的实验将侧重于热声不稳定性基本机制的基础，以便开发必要的工具来预测发生这些不稳定性的条件。从生物质生产的可再生燃料预计将在近期至中期内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，目前关于液体生物燃料在燃气涡轮机应用中的燃烧性能的研究还很少。因此，使用所要求的燃烧器进行的研究的第二个目的是在复制燃气涡轮机燃烧器的典型特征的大气压燃烧器中隔离燃料成分和流体动力学对来自不同液体常规燃料和生物燃料的排放的影响。所要求的燃烧器还将导致基准数据集的生成，这些数据集将被用作指导这些燃烧现象的数值研究的重点。 特别地，需要新的、有效的和精确的燃烧模型来预测对来自现有燃气涡轮机发动机设计的排放的影响和设计燃烧替代生物燃料的下一代、低排放、高燃料效率的燃气涡轮机发动机。

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.