A numerical support of leading point concept

Lee，Hsu Chew1,2; Dai，Peng1; Wan，Minping1,2; Lipatnikov，Andrei N.3

2022-06-30

10.1016/j.ijhydene.2022.05.140

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   Impact Factor & Quartile

0360-3199

1879-3487

Unsteady three-dimensional Direct Numerical Simulation (DNS) data obtained from 16 statistically planar and one-dimensional, complex-chemistry, lean (equivalence ratio is equal to 0.50 or 0.35) hydrogen-air flames propagating in forced, intense, small-scale turbulence (Karlovitz number up to 565) are reported. The data are analyzed to compare roles played by leading and trailing edges of a premixed turbulent flame brush in its propagation. The comparison is based on the following considerations: (i) positively (negatively) curved reaction zones predominate at the leading (trailing, respectively) edge of a premixed turbulent flame brush and (ii) preferential diffusion of molecular or atomic hydrogen results in increasing the local fuel consumption and heat release rates in positively or negatively, respectively, curved reaction zones. Therefore, turbulent burning velocities computed by deactivating differential diffusion effects for all species with the exception of either H or H are compared for assessing roles played by leading and trailing edges of a premixed turbulent flame brush in its propagation. By analyzing the DNS data, a significant increase in the local fuel consumption and heat release rates due to preferential diffusion of H or H is documented close to the leading or trailing, respectively, edges of the studied flame brushes. Nevertheless, turbulent burning velocities computed by activating preferential diffusion solely for H are significantly higher than turbulent burning velocities computed by activating preferential diffusion solely for H. This result indicates an important role played by the leading edge in the propagation of the explored turbulent flame brushes.

Hydrogen Leading point concept Lewis number Preferential diffusion Turbulent burning velocity Turbulent combustion

SCI ; EI

English

First

Guangdong Science and Technology Department[2019B21203001];Guangdong Science and Technology Department[2020B1212030001];National Natural Science Foundation of China[51976088];National Natural Science Foundation of China[91752201];National Natural Science Foundation of China[92041001];

Chemistry ; Electrochemistry ; Energy & Fuels

Chemistry, Physical ; Electrochemistry ; Energy & Fuels

WOS:000862450200004

PERGAMON-ELSEVIER SCIENCE LTD

20222412208834

Air ; Chemical activation ; Combustion ; Diffusion ; Reaction rates ; Velocity

Chemical Reactions:802.2 ; Chemical Products Generally:804

ENGINEERING

2-s2.0-85131445242

Scopus

1.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Mechanics and Maritime Sciences,Chalmers University of Technology,Gothenburg,SE-412 96,Sweden

Lee，Hsu Chew,Dai，Peng,Wan，Minping,et al. A numerical support of leading point concept[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2022,47(55):23444-23461.

Lee，Hsu Chew,Dai，Peng,Wan，Minping,&Lipatnikov，Andrei N..(2022).A numerical support of leading point concept.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,47(55),23444-23461.

Lee，Hsu Chew,et al."A numerical support of leading point concept".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 47.55(2022):23444-23461.