Direct numerical simulation of hydrogen-air reacting turbulent channel flows at Re_τ=180 and 400

The present study performs direct numerical simulations (DNS) of premixed hydrogen-air V-shaped flames in turbulent channel flows at friction Reynolds numbers (Re_τ) of 180 and 400. The near-wall flame quenching behavior and flame-turbulence interactions are investigated under these two turbulence conditions. The results reveal that, due to differences in turbulence intensity, near-wall flame quenching occurs within distinct sublayers of the near-wall region. Specifically, at Re_τ=180, flame quenching predominantly takes place within the viscous sublayer, whereas at Re_τ​=400, it primarily occurs in the buffer layer. Additionally, the influence of turbulence intensity on local flame-wall geometry and wall heat transfer associated with near-wall quenching is also examined.