Flame stabilization and auto-ignition of pulsed methane jets in a hot coflow: Influence of temperature

被引：39

作者：

Arndt, Christoph M. ^{[1
]}

Schiessl, Robert ^{[2
]}

Gounder, James D. ^{[1
]}

Meier, Wolfgang ^{[1
]}

Aigner, Manfred ^{[1
]}

机构：

[1] DLR, German Aerosp Ctr, Inst Combust Technol, D-70569 Stuttgart, Germany

[2] Karlsruhe Inst Technol, Inst Tech Thermodynam, D-76131 Karlsruhe, Germany

来源：

PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2013年 / 34卷

关键词：

Auto-ignition; Jet-in-hot-coflow; High-speed diagnostics; Numerical model; Vitiated coflow; CHEMILUMINESCENCE; MODEL;

D O I：

10.1016/j.proci.2012.05.082

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The auto-ignition of a pulsed methane jet issuing into a coaxial laminar coflow of hot exhaust gas from a lean premixed hydrogen/air flat flame has been studied experimentally by means of high-speed optical diagnostics. The downstream location of the first auto-ignition kernel as well as the stabilization height of the steady-state lifted jet flame and the auto-ignition time were determined by OH* chemiluminescence (CL) measurements. OH planar laser-induced fluorescence (PLIF) was used to determine further details of the auto-ignition with a higher spatial resolution and increased sensitivity. In order to three-dimensionally reconstruct the ignition kernel location in space and only include ignition kernels in the PLIF processing that first occurred inside the laser light sheet, broadband luminosity imaging from a viewing angle perpendicular to the PLIF and CL measurements was performed. The coflow temperature was varied in the temperature range between 1566 and 1810 K in order to study the influence of the coflow temperature on the auto-ignition height, auto-ignition time, and on the lift-off height of the steady lifted jet flame. In addition, detailed model simulations were performed to study the influence of temperature and strain on auto-ignition in reacting mixing layers. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：1483 / 1490

页数：8

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