Interaction between Mixing and Combustion of Slot-Injected Fuel in a Supersonic Combustor

摘要

An experimental study was carried out to investigate the effect of combustion on mixing process in a supersonic compustor. A two-dimensional, directly connected wind tunnel with a backward step was employed. Hydrogen was injected subsonically from a slot injector located at the downward wall of backward step. Both reacting and non-reacting experiments were carried out to reveal how combustion affects to the mixing process between the fuel flow and the air flow. The results showed that mixing process in the reacting flow is remarkably affected by the combustion, and at the test condition employed, mixing is enhanced by the combustion. In the present case, adverse pressure rise at the vicinity of the slot injector due to the precombustion shock system associated with combustion caused the subsonic fuel flow to expand into the air flow. This change in flow field enhanced the entrainment of air into the mixing layer and the mixing process.