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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >INVESTIGATION ON FLOWFIELD AND FUEL/AIR PREMIXING UNIFORMITIES OF LOW SWIRL INJECTOR FOR LEAN PREMIXED GAS TURBINES
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INVESTIGATION ON FLOWFIELD AND FUEL/AIR PREMIXING UNIFORMITIES OF LOW SWIRL INJECTOR FOR LEAN PREMIXED GAS TURBINES

机译：低旋流注射器的流域和燃料/空气预混均匀性调查，用于精益预混燃气轮机

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Based on the development trend of incorporating fuel holes into swirler-vanes and the advantages of wide operating conditions as well as low NOx emissions of LSI, this paper proposes an original lean premixed LSI with a convergent outlet. The influence of key structures on flow fields and fuel/air premixing uniformities of LSI is investigated by the combination of laser diagnostic experiments and numerical simulations. The flowfields of LSI shows that the main recirculation zone is detached from the convergent outlet and its axial dimensions are smaller than that of HSI, which can decrease the residence time of high-temperature gas to reduce NOx emissions. The fuel/air premixing characteristics show that the positions and diameters of fuel holes affect fuel/air premixing by changing the penetration depth of fuel. And when the penetration depth is moderate, it can give full play to the role of swirling air in enhancing premixing of fuel and air. In addition, the increase of the length of the premixing section can improve the uniformity of fuel/ar premixing, but it can also weaken the swirl intensity and increase the residence time of the combustible mixture within the LSI, which can affect flame stability and increase the risk of auto-ignition. Therefore, the design and selection of LSI structural parameters should comprehensively consider the requirements of fuel/air mixing uniformity, flame stability and avoiding the risk of auto-ignition. The results can provide the technical basis for LSI design and application in aero-derivative and land-based gas turbine combustors.
机译：基于将燃料孔的发展趋势掺入旋流叶片和宽操作条件的优点以及LSI的低NOx排放，提出了一种带有收敛出口的原始精益预混合LSI。通过激光诊断实验和数值模拟的组合研究了LSI的流场和燃料/空气预混合均匀性的关键结构的影响。 LSI的流场表明，主再循环区域从收敛出口拆下，其轴向尺寸小于HSI的轴线，这可以降低高温气体的停留时间，以减少NOx排放。燃料/空气预混合特性表明，燃料孔的位置和直径通过改变燃料渗透深度来影响燃料/空气预混合。当渗透深度适中时，它可以充分发挥旋转空气在增强燃料和空气预混方面的作用。此外，预混合部分的长度的增加可以提高燃料/ Ar预混合的均匀性，但也可以削弱旋流强度并增加可燃混合物在LSI内的停留时间，这会影响火焰稳定性和增加自动点火的风险。因此，LSI结构参数的设计和选择应全面考虑燃料/空气混合均匀性，火焰稳定性和避免自动点火风险的要求。结果可为航空衍生物和陆基燃气轮机燃烧器中的LSI设计和应用提供技术基础。

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