Ignition by transient hot turbulent jets: An investigation of ignition mechanisms by means of a PDF/REDIM method

被引：43

作者：

Ghorbani, A. ^{[1
]}

Steinhilber, G. ^{[2
]}

Markus, D. ^{[1
]}

Maas, U. ^{[2
]}

机构：

[1] Phys Tech Bundesanstalt, Braunschweig, Germany

[2] Karlsruhe Inst Technol, D-76021 Karlsruhe, Germany

来源：

PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2015年 / 35卷

关键词：

Hot jets; REDIM; Jet ignition; Turbulent premixed combustion; PDF method; HYDROGEN-AIR MIXTURES; GAS; INITIATION; CHEMISTRY; FLOWS;

D O I：

10.1016/j.proci.2014.06.104

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Understanding the ignition of combustible mixtures by hot jets of burnt gases plays an important role in explosion protection. In this work a PDF method in conjunction with a reaction-diffusion manifold (REDIM) is used to investigate the ignition of a hydrogen/air mixture by a hot turbulent jet. In accordance with experimental results it is observed in numerical investigations that after an ignition delay time, the ignition is typically initiated at the jet head vortex. The scope of the current work is to investigate the mechanisms leading to ignition and explain the processes governing the ignition delay time as well as the ignition location. It is shown that macro-as well as micromixing and the chemical kinetics have a profound influence on the ignition process and that a realistic model for the ignition process has to account for all these processes in combination with a transient description of the jet penetration. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：2191 / 2198

页数：8

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