Numerical Investigation on the Effect of Inclination Angle of the Wall Fin on the Hydrogen–Air Micro-combustion

Abstract

In this present study, combustion is investigated in a micro-scale channel with an internal triangular wall fin numerically. Numerical simulations have been performed for micro-combustion with triangular wall fin for fin-inclination angles of 40°, 50°, and 60° at different inlet velocities. Two small-sized recirculation zones are formed one behind each wall fin so that the flame is anchored and offers more residence time for stable reaction. The average combustion efficiency is observed to be greater than 97% for all the inclination angles in the considered range of inlet velocities. Though the effect of the inclination angle on the mean temperature on the outer wall is insignificant in terms of magnitude, the uniformity in its distribution is affected by the fin-inclination angle. The uniformity measured in terms of the uniformity index (UI) and standard deviation (SD) is better for higher inclination angles or lower inlet velocities. It is also demonstrated that the 50° inclination angle gives the highest average and maximum wall temperature in most inlet velocities.