Simultaneous OH/Fuel PLIF measurement for centrally-staged swirling spray flames at elevated pressures and temperatures
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摘要:
为研究近真实工况下先进航空发动机中心分级燃烧室内部流动反应组分场特性，在进口压力为0.5 MPa、进口温度为600 K的条件下对中心分级旋流液雾火焰开展同步的OH与Fuel（煤油PAH荧光）平面激光诱导荧光（planar laser-induced fluorescence, PLIF）测量。为应对加温加压液雾火焰测试的困难与挑战，本文在试验流程、光路设计、图像采集与处理等多个环节进行了优化。OH/Fuel PLIF同步测量结果表明：中心分级旋流液雾火焰存在4种典型的火焰结构；在进口温度、压力及总燃油供给量保持不变的条件下，随着燃油分级比的降低，主预燃级火焰耦合减弱，出现多种火焰结构的变化，其中预燃级对火焰稳定起到关键作用。
Abstract:The species distribution of reacting flow was investigated in the staged swirl spray flames at near-realistic conditions for advanced aero-engine applications. Simultaneous planar laser-induced fluorescence (PLIF) measurements of OH radicals and fuel (kerosene) were conducted in a centrally staged combustor at an inlet pressure of 0.5 MPa and an inlet temperature of 600 K. To address the difficulties and challenges in PLIF measurements of complex spray flames at engine-relevant conditions, a series of optimization measures were taken in the experimental procedure, optical layout, image acquisition, and post-processing. The simultaneous OH/Fuel PLIF results reveal four typical flame structures in the combustor. Under constant inlet temperature, pressure, and total fuel supply, a reduction in the fuel staging ratio weakens the coupling between the pilot and main flames, leading to diverse variations in flame structures, where the pilot stage is proven to play a critical role in flame stabilization.
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图 1 中心分级旋流液雾模型燃烧室示意图
Figure 1. Schematic diagram of the centrally staged swirl spray combustor
图 2 加温加压燃烧光学诊断试验台
Figure 2. Pre-heated and pressurized combustion test rig for optical diagnostics
图 4 双像器使用中涉及的重要事项
Figure 4. Important considerations associated with the use of the image doubler
图 5 Fuel PLIF原始图像的校正过程
Figure 5. Illustration of corrections performed for a raw Fuel PLIF image
图 6 RP-3航空煤油与正庚烷预燃级火焰的OH PLIF结果对比
Figure 6. Comparison of OH PLIF results from a pilot flame burning RP-3 kerosene and n-heptane
图 7 不同分级比下的OH/ Fuel PLIF 时均图像
Figure 7. Time-averaged OH/Fuel PLIF images at different γ
图 8 γ=0.3时4种典型火焰结构的OH/Fuel PLIF瞬态图像
Figure 8. Instantaneous OH/Fuel PLIF images showing four typical flame structures at γ=0.3
图 9 不同分级比下典型火焰结构的瞬时OH/Fuel PLIF图像
Figure 9. Instantaneous OH/Fuel PLIF images illustrating typical flame structures at different γ
图 10 主预燃级耦合的火焰与燃油分布特征
Figure 10. Illustration of flame and fuel distribution associated with the main-pilot coupling
表 1 试验工况
Table 1. Test conditions
工况 SR Φmain Φpilot 瞬时火焰结构 1 0.4 0.31 1.31 Ⅱ，Ⅳ 2 0.3 0.36 0.98 Ⅰ，Ⅱ，Ⅲ，Ⅳ 3 0.2 0.41 0.66 Ⅰ，Ⅳ 4 0.15 0.43 0.49 Ⅰ，Ⅲ 5 0.1 0.46 0.33 Ⅲ，Ⅳ 6 0.08 0.47 0.26 Ⅲ，Ⅳ，复燃 
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