Non-Intrusive, Laser-Based Imaging of Jet-A Fuel Injection and Combustion Species in High Pressure, Subsonic Flows
Non-Intrusive, Laser-Based Imaging of Jet-A Fuel Injection and Combustion Species in High Pressure, Subsonic Flows
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对高压、亚音速流中的 Jet-A 燃油喷射和燃烧物质进行非侵入式激光成像
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发表时间：
2001
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通讯作者：
W. Degroot
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作者：
R. J. Locke;Y. Hicks;R. Anderson;W. Degroot
NASA格伦研究中心（GRC）燃烧研究工作的重点是与工业界合作，设计和试验亚超音速应用的燃气涡轮燃烧室和子部件。这些下一代飞机燃烧室需要满足严格的国际环境限制，限制排放。为了实现这些目标，创新的燃烧室概念需要在远超过当前设计的温度和压力下操作。新的和创新的诊断工具是必要的，以表征这些流，因为现有的方法是不够的。在GRC的燃烧诊断小组已经实施了一套高灵敏度，非侵入性的光学成像方法来诊断这些新的发动机概念的流场。通过使用光学可访问的燃烧室和火焰管，燃料和中间燃烧物质的成像通过平面激光诱导荧光（PLIF）在现实的压力，现在是可能的。通过平面Mie散射和PLIF方法的燃料喷射过程的直接成像也被执行。此外，平面燃料荧光成像和计算分析的新组合允许流场的3-D检查，从而产生空间和时间分辨的燃料/空气体积分布图。这些图提供了对实际条件下燃油喷射过程的详细了解，从而大大提高了对喷油器性能和其他燃烧现象的评估。稳定的物种，如CO
ABSTRACT The emphasis of combustion research efforts at NASA Glenn Research Center (GRC) is on collaborating with industry to design and test gas-turbine combustors and subcomponents for both sub- and supersonic applications. These next-generation aircraft combustors are required to meet strict international environmental restrictions limiting emissions. To meet these goals, innovative combustor concepts require operation at temperatures and pressures far exceeding those of current designs. New and innovative diagnostic tools are necessary to characterize these flow streams since existing methods are inadequate. The combustion diagnostics team at GRC has implemented a suite of highly sensitive, nonintrusive optical imaging methods to diagnose the flowfields of these new engine concepts. By using optically accessible combustors and flametubes, imaging of fuel and intermediate combustion species via planar laser-induced fluorescence (PLIF) at realistic pressures are now possible. Direct imaging of the fuel injection process through both planar Mie scattering and PLIF methods is also performed. Additionally, a novel combination of planar fuel fluorescence imaging and computational analysis allows a 3-D examination of the flowfield, resulting in spatially and temporally resolved fuel/air volume distribution maps. These maps provide detailed insight into the fuel injection process at actual conditions, thereby greatly enhancing the evaluation of fuel injector performance and other combustion phenomena. Stable species such as CO