Visualization of flame structure in supersonic combustion by Planar Laser Induced Fluorescence technique
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摘要: 平面激光诱导荧光（PLIF）技术能够高时空分辨成像火焰结构并用于研究超声速燃烧机理。利用OH-PLIF与CH-PLIF技术研究了超声速燃烧的火焰结构。其中，利用OH-PLIF技术对燃烧室中3个展向截面与2个流向截面的凹腔稳定火焰反应区结构进行成像，利用CH-PLIF技术观测凹腔火焰放热区结构。实验结果表明：全局当量比较低时燃烧主要发生在凹腔中，OH沿中轴线对称分布；高当量比时火焰位置更高，OH主要沿燃烧室两侧壁面分布；CH所存在的超声速燃烧放热区呈现高度褶皱和破碎结构，放热区分布在比反应区更窄的区域。Abstract: Planar Laser Induced Fluorescence (PLIF) can be used to visualize the flame structure with high temporal and spatial resolution and investigate the mechanism of supersonic combustion. In this paper, OH-PLIF and CH-PLIF techniques were used to study the flame structure in supersonic combustion. The cavity-stabilized reaction zone structure of the three streamwise sections and two spanwise sections in a supersonic combustor was obtained by using the OH-PLIF technique. The experimental results show that the combustion occurs in the inner cavity and the OH radicals are distributed symmetrically along the central axis at a low global equivalence ratio. The OH radicals are primarily distributed at two-side-wall of the combustor and the location of the flame is higher than that of the cavity at a high equivalence ratio. The heat-release structure of the cavity-stabilized flame was observed by the CH-PLIF technique. It is found that the heat-release zone is highly wrinkled and distorted in the supersonic combustion and it is distributed in a narrower region than the reaction zone.
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图 1 kg/s超声速燃烧直连式实验台组成结构示意图
Figure 1. Schematic of 1 kg/s cavity-stabilized scramjet combustor
图 3 PLIF测量所选取截面在凹腔中的相对位置示意图
Figure 3. The relative position of the section selected for PLIF imaging in the cavit
图 4 不同全局当量比下超声速燃烧展向截面OH-PLIF结果
Figure 4. OH-PLIF images measured instreamwise sections for different global equivalence ratio
图 5 不同当量比下多个展向截面OH-PLIF的平均强度分布对比
Figure 5. Comparison of OH-PLIF average intensities in streamwise sections for different equivalence ratios
图 6 不同全局当量比下超声速燃烧流向截面OH-PLIF结果
Figure 6. OH-PLIF images measured inspanwise sections for different global equivalence ratios
图 7 流向截面垂直方向上OH-PLIF平均强度分布
Figure 7. Distributionn of OH-PLIF average intensity in streamwise sections in vertical direction
图 8 凹腔超声速燃烧CH-PLIF图像
Figure 8. CH-PLIF image in a cavity-stabilized scramjet combustor
图 9 OH-PLIF与CH-PLIF在流向截面的火焰结构成像对比
Figure 9. Comparison of OH-PLIF and CH-PLIF image in a cavity-stabilized scramjet combustor
图 10 OH与CH在流向截面的平均强度与强度分布曲线对比
Figure 10. Comparison of OH and CH average intensities in streamwise sections
表 1 PLIF实验系统配置
Table 1. The experimental system setup of PLIF
所测中间产物 OH CH 激发激光波长 ~283 nm ~387 nm 激光器系统 Nd:YAG泵浦的染料激光器(Sirah) 可调谐Alxanderite激光器 激光脉宽 ~10 ns ~100 ns 检测荧光波长 ~310 nm ~431 nm 能级跃迁 A-X B-X 相机 ICMOS PIMAX II ICCD 镜头 Nikon UV, f=105 mm, F/4.5 Nikon, f=50 mm, F/1.2 滤镜 UG11与WG305 431±10 nm带通 光学透镜组 凹柱面镜f=-40 mm, 凸柱面镜f=500 mm (流向)
凹柱面镜f=-40 mm, 凸柱面镜f=200 mm (展向)凹柱面镜f=-40 mm
凸柱面镜f=130 mm
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