An Effect of Dilution and Turbulence on Formation of MILD Combustion

Ho Yeon Lee; Sang Soon Hwang

doi:10.15231/jksc.2023.28.1.001

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2023 Vol.28, Issue 1 Next Page

Research Article

An Effect of Dilution and Turbulence on Formation of MILD Combustion 희석율과 난류강도에 따른 수소 MILD 연소 형성

31 March 2023. pp. 1-8

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Abstract

An effect of dilution and turbulence on the formation of MILD combustion was numerically analyzed using κ-ε (SKE) and Eddy Dissipation Concept (EDC) model appropriate to MILD combustion simulation. Results show that the temperature distribution of hydrogen and methane were similar under the condition of 3% diluted oxygen but the combustion reaction rate of hydrogen is increased as the flame temperature was about 80 degrees higher. This higher reaction rate tends to narrow MILD zone compared to methane case. As the dilution effect is increased and the dilution oxygen concentration becomes lower, the MILD area with Da<1 is shown to be wider with no significant difference. When the turbulence intensity is increased from 2.5% to 5%, the MILD region with Da<1 tends to be formed in a wider area, which is more favorable condition for hydrogen MILD combustion.

Keywords

Hydrogen

Damköhler number

MILD (Moderate Intensity Low oxygen Dilution)

DJHC (Delft Jet in Hot diluted Coflow)

References

S. Marragou, H. Magnes, T. Poinsot, L. Selle, T. Schull, Stabilization regimes and pollutant emissions from a dual fuel CH₄/H₂ and dual swirl low NOx burner, Int. J. Hydrog. Energy, 47 (44) (2022) 19275-19288. 10.1016/j.ijhydene.2022.04.033

K. Kikuchi, T Motegi, T. Hori, F. Akamatsu, Influence of nozzle design parameters on exhaust gas characteristics in practical-scale flameless hydrogen combustion, Int. J. Hydrog. Energy, 47 (49) (2022) 21287-21297. 10.1016/j.ijhydene.2022.04.230

X. Liu, W. Shao, C. Liu, X. Bi, Y. Liu, Y. Xiao, Numerical study of a high-hydrogen micromix model burner using flamelet-generated manifold, Int. J. Hydrog. Energy, 46 (39) (2021) 20750-20764. 10.1016/j.ijhydene.2021.03.157

J.A. Wṻnning, J.G. Wṻnning, Flame-Less Oxidation to Reduce Thermal NO- Formation, Prog. Energy Combust. Sci., 23 (1) (1997) 81-94. 10.1016/S0360-1285(97)00006-3

N. Peters, Turbulent Combustion, Cambridge University Press, Cambridge, 2000. 10.1017/CBO9780511612701

G. Sarras, Y. Mahmoudi, L. Arteaga Mendez, E. van Veen, M. Tummers, D. Roekaerts, Modeling of Turbulent Natural Gas and Biogas Flames of the Delft Jet-In-Hot-Coflow Burner: Effects of Coflow Temperature, Fuel Temperature and Fuel Composition on the Flame Lift-Off Height, Flow Turbul. Combust., 93 (4) (2014) 607-635. 10.1007/s10494-014-9555-3

C. Rodrigues, M. Tummers, E. van Veen, D.J.E.M. Roekaerts, Effects of coflow temperature and composition on ethanol spray flamesin hot-diluted coflow, Int. J. Heat Fluid Flow, 51 (2015) 309-323. 10.1016/j.ijheatfluidflow.2014.10.006

E. Oldenhof, M.J. Tummers, E.H. van Veen, D.J.E.M. Roekaerts, Role of Entrainment in the Stabilisation of Jet-In-Hot-Coflow Flames, Combust. Flame, 158 (8) (2011) 1553-1563. 10.1016/j.combustflame.2010.12.018

B. Bhatia, A. De, D. Roekaerts,A. Masri, Numerical analysis of dilute methanol spray flames in vitiated coflow using extended flamelet generated manifold model, Phys. Fluids, 34 (2022) 075111. 10.1063/5.0098705

H.Y. Lee, C.L. Cha, S.S. Hwang, Numerical investigation on NOX formation in oxygen-CH₄ MILD combustion with air leakage, J. Mech. Sci. Tech., 33 (2019) 3733-3741. 10.1007/s12206-019-0715-1

F.C. Christo, B.B. Dally, Modeling turbulent reacting jets issuing into a hot and diluted coflow, Combust. Flame, 142 (1-2) (2005) 117-129. 10.1016/j.combustflame.2005.03.002

P.H. Lee, S.S. Hwang, NOx Formation in Hydrogen-Methane Turbulent Partially Premixed Flame Under MILD Combustion Condition, Trans. Korean Soc. Mech. Eng. B, 41 (12) (2017) 821-828. 10.3795/KSME-B.2017.41.12.821

B.B. Dally, A.N. Karpetis, R.S. Barlow, Structure of turbulent non-premixed jet flames in a diluted hot co-flow, Proc. Combust. Inst, 29 (1) (2002) 1147-1154. 10.1016/S1540-7489(02)80145-6

A. Mardani, S. Tabejamaat, M. Ghamari. Numerical study of influence of molecular diffusion in the Mild combustion regime. Combust. Theory Model, 14 (2010) 747-774.(1) (2002) 1147-1154. 10.1080/13647830.2010.512959

Information

Publisher :The Korean Society Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of The Korean Society Combustion
Journal Title(Ko) :한국연소학회지
Volume : 28
No :1
Pages :1-8
Received Date : 2023-01-15
Revised Date : 2023-02-02
Accepted Date : 2023-02-02
DOI :https://doi.org/10.15231/jksc.2023.28.1.001

Journal of The Korean Society Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

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