Cinematographic imaging of hydroxyl radicals in turbulent flames by planar laser-induced fluorescence up to 5 kHz repetition rate

被引：47

作者：

Kittler, C. ^{[1
]}

Dreizler, A. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, FG Energ & Kraftwerkstechn, D-64287 Darmstadt, Germany

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2007年 / 89卷 / 2-3期

关键词：

D O I：

10.1007/s00340-007-2803-7

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Temporally resolved measurements of transient phenomena in turbulent flames, such as extinction, ignition or flashback, require cinematographic sampling of two-dimensional scalar fields. Hereby, repetition rates must exceed typical flame-inherent frequencies. The high sensitivity planar laser-induced fluorescence (PLIF) has already proved to be a practical method for scalar imaging. The present study demonstrates the feasibility of generating tuneable narrowband radiation in the ultraviolet (UV) spectral range at repetition rates up to 5 kHz. Pulse energies were sufficiently high to electronically excite hydroxyl radicals (OH) produced in a partially-premixed turbulent opposed jet (TOJ) flame. Red-shifted fluorescence was detected two-dimensionally by means of an image-intensified CMOS camera. Sequences comprising up to 4000 frames per run were recorded. Besides statistically stationary conditions, extinction of a turbulent flame due to small Damkohler numbers is presented showing the potential of the technique.

引用

页码：163 / 166

页数：4

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