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Towards Under-Resolved Simulation of Lean Hydrogen-Air Combustion Including the Effect of Intrinsic Flame Front Instabilities

[+] Author and Article Information
Peter Katzy

Lehrstuhl für Thermodynamik Fakultät für Maschinenwesen Technische Universität München 85748 Garching Germany
katzy@td.mw.tum.de

Josef Hasslberger

Lehrstuhl für Thermodynamik Fakultät für Maschinenwesen Technische Universität München 85748 Garching Germany
hasslberger@td.mw.tum.de

Lorenz R. Boeck

Lehrstuhl für Thermodynamik Fakultät für Maschinenwesen Technische Universität München 85748 Garching Germany
lbock@caltech.edu

Thomas Sattelmayer

Lehrstuhl für Thermodynamik Fakultät für Maschinenwesen Technische Universität München 85748 Garching Germany
sattelmayer@td.mw.tum.de

1Corresponding author.

ASME doi:10.1115/1.4036984 History: Received September 26, 2016; Revised May 18, 2017

Abstract

The presented work aims to improve CFD explosion modeling for lean hydrogen-air mixtures on under-resolved grids. Validation data is obtained from an entirely closed laboratory scale explosion channel (GraVent facility). Investigated hydrogen-air concentrations range from 6 to 19 vol.-%. Initial conditions are p = 1 atm and T = 293 K. Two highly time-resolved optical measurement techniques are applied simultaneously: (1) 10 kHz shadowgraphy captures line-of-sight integrated macroscopic flame propagation; and (2) 20 kHz OH-PLIF (planar laser-induced fluorescence of the OH radical) resolves microscopic flame topology without line-of-sight integration. This paper presents the experiment, measurement techniques, data evaluation methods and simulation results. The evaluation methods encompass the determination of flame tip velocity over distance and a detailed time-resolved quantification of flame topology based on OH-PLIF images. One parameter is the length of wrinkled flame fronts in the OH-PLIF plane obtained through automated post-processing. It reveals the expected enlargement of flame surface area by instabilities on microscopic level. A strong effect of mixture composition is observed. Simulations based on the new model formulation, incorporating the microscopic enlargement of the flame front, show a promising behavior, where the impact of the augmented flame front on the observed flame front velocities can be detected.

Copyright (c) 2017 by ASME
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