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首页> 外文期刊>Applied optics >High-repetition-rate three-dimensional OH imaging using scanned planar laser-induced fluorescence system for multiphase combustion
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High-repetition-rate three-dimensional OH imaging using scanned planar laser-induced fluorescence system for multiphase combustion

机译：使用扫描平面激光诱导荧光系统进行多相燃烧的高重复率三维OH成像

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摘要

Imaging dynamic multiphase combusting events is challenging. Conventional techniques can image only a single plane of an event, capturing limited details. Here, we report on a three-dimensional, time-resolved, OH planar laser-induced fluorescence (3D OH PLIF) technique that was developed to measure the relative OH concentration in multiphase combustion flow fields. To the best of our knowledge, this is the first time a 3D OH PLIF technique has been reported in the open literature. The technique involves rapidly scanning a laser sheet across a flow field of interest. The overall experimental system consists of a 5 kHz OH PLIF system, a high-speed detection system (image intensifier and CMOS camera), and a galvanometric scanning mirror. The scanning mirror was synchronized with a 500 Hz triangular sweep pattern generated using Labview. Images were acquired at 5 kHz corresponding to six images per mirror scan, and 1000 scans per second. The six images obtained in a scan were reconstructed into a volumetric representation. The resulting spatial resolution was 500 × 500 × 6 voxels mapped to a field of interest covering 30 mm × 30 mm × 8 mm. The novel 3D OH PLIF system was applied toward imaging droplet combustion of methanol gelled with hydroxypropyl cellulose (HPC) (3 wt. %, 6 wt. %), as well as solid propellant combustion, and impinging jet spray combustion. The resulting 3D dataset shows a comprehensive view of jetting events in gelled droplet combustion that was not observed with high-speed imaging or 2D OH PLIF. Although the scan is noninstantaneous, the temporal and spatial resolution was sufficient to view the dynamic events in the multiphase combustion flow fields of interest. The system is limited by the repetition rate of the pulsed laser and the step response time of the galvanometric mirror; however, the repetition rates are sufficient to resolve events in the order of 100 Hz. Future upgrade includes 40 kHz pulsed UV laser system, which can reduce the scan time to 125 μs, while keeping the high repetition rate of 1000 Hz.
机译：动态多相燃烧事件的成像具有挑战性。传统技术只能对事件的单个平面成像，只能捕获有限的细节。在这里，我们报告了一种三维的，时间分辨的，OH平面激光诱导的荧光（3D OH PLIF）技术，该技术用于测量多相燃烧流场中的相对OH浓度。据我们所知，这是公开文献中首次报道3D OH PLIF技术。该技术涉及跨感兴趣的流场快速扫描激光片。整个实验系统由一个5 kHz OH PLIF系统，一个高速检测系统（图像增强器和CMOS相机）以及一个电流计扫描镜组成。扫描镜与使用Labview生成的500 Hz三角扫描图案同步。以5 kHz的频率采集图像，对应于每个镜像扫描六个图像，以及每秒1000个扫描。扫描获得的六幅图像被重建为体积表示。最终的空间分辨率为500×500×6体素，映射到覆盖30 mm×30 mm×8 mm的感兴趣区域。新型3D OH PLIF系统应用于成像与羟丙基纤维素（HPC）（3 wt。％，6 wt。％）凝胶化的甲醇的液滴燃烧，以及固体推进剂燃烧和撞击喷射喷雾燃烧。生成的3D数据集显示了胶凝液滴燃烧中的喷射事件的全面视图，而高速成像或2D OH PLIF则未观察到该事件。尽管扫描不是瞬时的，但时间和空间分辨率足以查看感兴趣的多相燃烧流场中的动态事件。该系统受到脉冲激光的重复率和电流镜的阶跃响应时间的限制。但是，重复率足以解决100 Hz量级的事件。未来的升级包括40 kHz脉冲UV激光系统，该系统可以将扫描时间缩短至125μs，同时保持1000 Hz的高重复频率。

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