Work

On the validity of flamelet based mean reaction rate closures in lean H2-air turbulent premixed flames

Year: 2025

Type: article

Abstract: The validity of the flamelet-based mean reaction rate closures for lean hydrogen-air premixed flames using Flame Surface Density (FSD) and Scalar Dissipation Rate (SDR) approaches is investigated in this study. Analysis of Direct Numerical Simulation (DNS) data for equivalence ratios of 0.4 and 0.7 under different turbulence intensities reveals that the SDR-based closure tends to underpredict the mean reaction rate for H 2 , O 2 , and H 2 O mass fraction-based reaction progress variables. Moreover, incorporating the effects of local equivalence ratio variations does not significantly improve the performance of the SDR-based closure. It is demonstrated that the FSD-based reaction rate closure requires accurate modelling of the stretch factor. Furthermore, the choice of the reaction progress variable that yields optimal performance for the mean reaction rate closure depends on the specific closure approach adopted.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2025.06.045

Authors: Vishnu Mohan, Frederick W. Young, Umair Ahmed, Nilanjan Chakraborty

Institution: Newcastle University

Language: English

Topic: Combustion and flame dynamics

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,730