Experimental investigation on ignition enhancement of partially covered cavities in a supersonic flow

摘要

Ignition enhancement characteristics of partially covered cavity in an ethylene-fueled scramjet combustor were investigated experimentally under the inflow conditions of Ma=2.1, stagnation pressure P-0=0.7MPa, and stagnation temperature T-0=846K. It is concluded that under the influence of the baffle, the covered region will become a region with sufficient fuel during the stable combustion process and wall-pressure distribution will be increased due to this restricted region. Comparing with the uncovered cavity under the same equivalence ratio, partially covered cavity is more suitable for the formation and propagation of flame kernel, and ignition in the scramjet combustor could be intensified due to this cavity configuration.