Effects of dual-inlet on premixed hydrogen/air combustion characteristics and thermal performance for micro thermophotovoltaic application

Premixed H2/air combustion in the micro-combustor with dual-inlet is investigated. Effects of the second-inlet settings on the combustion characteristics, thermal performance and radiation efficiency are discussed and compared. The results indicate that the second-inlet can efficiently modify burning characteristics and heat transmission, improving the burner thermal performance. With the increase of the distance between second-inlet and inlet, the mean outer wall temperature Tm is first risen and then down with a fixed reactants ratio of second-inlet Qin. It also affects the flow field and radiation temperature, and combustor C3 achieves the highest Tm 1180.9 K and radiation efficiency 28.231% at the total flow rate mf = 3.376 x 10-5 kg/s and Qin = 10%. For an augment of mf, the radiation tem-perature is improved while radiation efficiency is declined, and the combustor C2 obtains the highest radiation power 42.3 W at mf = 5.626 x 10-5 kg/s and Qin = 20%.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.