Peiyi LI, Zun CAI, Yanan WANG, Quanqi WANG, Taiyu WANG, Hongbo WANG, Mingbo SUN
DOI Number: 10.60853/cs1r-6839
Conference number: HiSST-2024-00108
With the research of scramjet is gradually developed from small scale to larger scale, it is an inevitable requirement to design large-scale engine on the guide of small-scale engine research results according to the law of scale effect. However, the research on the scale effect is mainly based on the steady process of the flow and combustion, little attention has been paid to the unsteady process. In order to investigate the scale effects on the unsteady process, the ignition in three scramjet combustor of different scale were studied with three-dimension numerical simulation. The numerical study is based on a scramjet combustor of single-cavity ethylene-fueled scramjet with single-side expansion. The k-omega SST two-equation turbulence model are used, ignition process was added to the energy equation as an energy deposition term coupled with the finite rate model. Through the establishment of energy deposition ignition model, the detailed simulation of the main parameters affecting the ignition process, such as ignition position, energy and duration, is achieved. Secondly, through the numerical simulation of the three-dimensional ignition process of the cavity combustor with different scales, it is verified that there is an obvious scale effect in the ignition process of the cavity combustor with different scales. Finally, the specific performance law of the scale effect of ignition energy and ignition time on the cavity ignition process is further explored.