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Experimental Investigation of the Stability Limits for a Low-Emission, Two-Stage Combustor

机译：低排放两级燃烧器稳定性极限的实验研究

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摘要

Results are presented of the experimental investigation of gaseous fuel combustion in a combustor comprising two zones in series each of which has its own burner unit (BU). The first burner unit (BU1) is a conventional one for low-emission combustors. It contains swirlers, a fuel-air mixing zone, a pilot burner, and a main burner. BU1 is fed with a premixed fuel-air mixture (FAM). The second burner unit (BU2) is located downstream along the flow, behind the first combustion zone. It is supplied with gaseous fuel (i.e., natural gas) without premixing with air. Diffusion combustion occurs in the second zone. The potential was studied for extending the stable operation range of the first combustion zone to the range of low excess air factors by creating radial nonuniformity in the FAM concentration at the BU1 outlet. This is accomplished by feed air in one hole in the fuel tubes above the vanes of the main burner swirler. The best FAM concentration at the first stage minimizing NO~( x )and CO emission during joint operation of two combustion stages installed in series was determined. The results of the experiments with BU2, which is a thick hollow disk with a nozzle-shaped orifice with holes in the bore surface for fuel injection, are presented. The experiments were carried out with a model combustor in the test facility at OAO VTI.
机译：给出了燃烧器中气体燃料燃烧的实验研究结果，该燃烧器包括两个串联的区域，每个区域都有自己的燃烧器单元（BU）。第一燃烧器单元（BU1）是用于低排放燃烧器的常规燃烧器单元。它包含旋流器，燃料-空气混合区，引燃器和主燃烧器。 BU1供有预混合的燃料-空气混合物（FAM）。第二燃烧器单元（BU2）沿着气流位于第一燃烧区的下游。在不与空气预混合的情况下供应气态燃料（即天然气）。扩散燃烧发生在第二区域。通过在BU1出口处的FAM浓度产生径向不均匀性，研究了将第一燃烧区的稳定运行范围扩展至低过量空气系数范围的潜力。这是通过在主燃烧器旋流器叶片上方的燃料管中的一个孔中注入空气来实现的。确定了第一阶段的最佳FAM浓度，该浓度可使串联安装的两个燃烧阶段联合运行时的NO〜（x）和CO排放最小。给出了BU2的实验结果，BU2是一个厚实的中空圆盘，带有一个喷嘴形孔，孔表面有用于燃料喷射的孔。实验是在OAO VTI的测试设施中使用模型燃烧器进行的。

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