带旋流杯的模型回流燃烧室主燃孔射流研究

实验研究了带轴径向旋流杯、主燃孔和冷却气流的模型回流燃烧室在工作压力为300 kPa,燃烧室压力损失为2.5%时主燃孔射流的特点以及其对燃烧室流场的影响.结果表明,回流式燃烧室内外壁主燃孔射流进气方向与顺流式燃烧室不同,即内壁主燃孔射流向流动方向下游倾斜,外壁主燃孔射流向流动方向上游倾斜;主燃孔射流穿透深度很大,几乎能穿透到对面火焰筒壁;中心回流区长度明显缩短,其长度L与旋流杯出口直径D的比值(L/D)约为0.5,而常规的顺流式燃烧室的L/D约为1.3.

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 combustors,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.