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Investigation of the transition from single to group coal particle combustion using high-speed scanning OH-LIF and diffuse backlight-illumination

Li, Tao ; Geschwindner, Christopher ; Köser, Jan ; Schiemann, Martin ; Dreizler, Andreas ; Böhm, Benjamin (2021)
Investigation of the transition from single to group coal particle combustion using high-speed scanning OH-LIF and diffuse backlight-illumination.
In: Proceedings of the Combustion Institute, 38 (3)
doi: 10.1016/j.proci.2020.06.314
Article, Bibliographie

Abstract

The transition from single to group high-volatile bituminous (hvb) coal particle combustion is experimentally investigated in a laminar flow reactor using state-of-the-art laser diagnostics. Simultaneous volumetric OH-LIF imaging using a novel laser scanning technique is combined with time-resolved diffuse backlight-illumination (DBI) providing fundamental insights into flame topologies. Three-dimensional visualizations of volatile flames are first demonstrated on single particle combustion and then applied to characterize the flame topology associated with group particle combustion. The particle number density (PND) determined by instantaneous DBI images covers a wide range from the individual particle combustion to group combustion enabling the determination of transitional effects. While an enclosed volatile flame is observed with dominant spherical structures at low PND, enveloping flames surrounding non-flammable regions reveal distinct features as PND increases. The corresponding physical process is described by exploring the effect of local gas temperatures. The particle velocity affected by the inter-particle and particle-gas interaction is analyzed along the axial and radial direction. The ignition delay time increases gradually as PND increases. The non-flammable region is quantified by evaluating the non-flammable volume ratio Rnf. The non-flammability becomes pronounced if PND exceeds a limit of approximately 0.37mm-3, which corresponds to an inter-particle distance of 4 dP in this study.

Item Type: Article
Erschienen: 2021
Creators: Li, Tao ; Geschwindner, Christopher ; Köser, Jan ; Schiemann, Martin ; Dreizler, Andreas ; Böhm, Benjamin
Type of entry: Bibliographie
Title: Investigation of the transition from single to group coal particle combustion using high-speed scanning OH-LIF and diffuse backlight-illumination
Language: English
Date: 2021
Journal or Publication Title: Proceedings of the Combustion Institute
Volume of the journal: 38
Issue Number: 3
DOI: 10.1016/j.proci.2020.06.314
URL / URN: https://www.sciencedirect.com/science/article/pii/S154074892...
Abstract:

The transition from single to group high-volatile bituminous (hvb) coal particle combustion is experimentally investigated in a laminar flow reactor using state-of-the-art laser diagnostics. Simultaneous volumetric OH-LIF imaging using a novel laser scanning technique is combined with time-resolved diffuse backlight-illumination (DBI) providing fundamental insights into flame topologies. Three-dimensional visualizations of volatile flames are first demonstrated on single particle combustion and then applied to characterize the flame topology associated with group particle combustion. The particle number density (PND) determined by instantaneous DBI images covers a wide range from the individual particle combustion to group combustion enabling the determination of transitional effects. While an enclosed volatile flame is observed with dominant spherical structures at low PND, enveloping flames surrounding non-flammable regions reveal distinct features as PND increases. The corresponding physical process is described by exploring the effect of local gas temperatures. The particle velocity affected by the inter-particle and particle-gas interaction is analyzed along the axial and radial direction. The ignition delay time increases gradually as PND increases. The non-flammable region is quantified by evaluating the non-flammable volume ratio Rnf. The non-flammability becomes pronounced if PND exceeds a limit of approximately 0.37mm-3, which corresponds to an inter-particle distance of 4 dP in this study.

Uncontrolled Keywords: Coal particle volatile combustion, Group particle combustion, High-speed laser-induced fluorescence, Laser scanning, Diffuse backlight-illumination
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Reactive Flows and Diagnostics (RSM)
TU-Projects: DFG|TRR129|TP B07 Dr. Böhm TRR1
Date Deposited: 27 Oct 2021 06:58
Last Modified: 13 Sep 2022 11:46
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