以3千赫重复频率同时测量湍流举升射流火焰的平面碳烟结构和速度场

2019/12/06   下载量: 0

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应用领域 能源/新能源
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司的时间分辨粒子成像测速系统FlowMaster-TR和时间分辨激光诱导白炽光成像FlameMaster-LII系统,以3千赫重复频率同时测量湍流举升射流火焰的平面碳烟结构和速度场。

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We describe a newly developed combustion diagnostic for the simultaneous planar imaging of soot structure and velocity fields in a highly sooting, lifted turbulent jet flame at 3000 frames per second, or two orders of magnitude faster than “conventional” laser imaging systems. This diagnostic uses short pulse duration (8 ns), frequency-doubled, diode-pumped solid state (DPSS) lasers to excite laserinduced incandescence (LII) at 3 kHz, which is then imaged onto a high framerate CMOS camera. A second (dual-cavity) DPSS laser and CMOS camera form the basis of a particle image velocity (PIV) system used to acquire 2-component velocity field in the flame. The LII response curve (measured in a laminar propane diffusion flame) is presented and the combined diagnostics then applied in a heavily sooting lifted turbulent jet flame. The potential challenges and rewards of application of this combined
imaging technique at high speeds are discussed.

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