Computational study of the multi hydrogen jets in presence of the upstream step in a Ma=4 supersonic flow

© 2020 Hydrogen Energy Publications LLC The injection of the hydrogen is the main noteworthy stage for the advance of the supersonic engine. In our computational study, the incidence of the step condition in the upstream of the hydrogen multi-jet is investigated for the augmentation of the fuel distribution in downside of the fuel jets at Mach = 4. To perform our research, a 3-dimensional computational domain is taken to unveil the primary flow organization of the hydrogen jets and its interactions with the freestream for the advance of fuel mixing. This work comprehensively examined the impression of the jet pressure on the mixing value and flow structure. Besides, the three-dimensional outcome of the step on the pattern of the four multi-jets is compared with the single equivalent jet. According to our results, the existence of step improves the fuel mixing efficiency up to 30% close to of early jets. Our findings reveal that increasing the step height from 0.5 to 2 mm enhances the fuel mixing more than 15%