Research on primary jet of a reverse flow combustor model with swirl cup

The characteristics of primary jets and its effects on the velocity field of reverse flow combustor model, which primarily comprising an axial-radial swirl cup and a primary hole with cooling air, was studied experimentally in the case of operating pressure of 300Kpa and pressure lose of combustor of 2.5%. The results show that, the air intake direction of primary jets into the reverse flow combustor differs from that of straight-flow com-bustors, namely, the inner jets inclined to downstream direction, and the outer jets inclined to upstream direction. The penetration of the primary jets is very deep to reach almost the opposite liner wall. And, the length of the recirculation zone is shortened remarkably, with L/D (length to diameter of swirl cup) about 0.5D, and L/D of typical straight-flow combustor about 1.3.