带空气雾化喷嘴的燃烧室压力对烟粒浓度及火焰辐射的影响

 在一个小型高压燃烧试验台上研究了燃烧室采用空气雾化喷嘴后,燃烧室压力对燃烧室内烟粒浓度和火焰辐射的影响。实验的主要参数 :来流空气压力为 1～ 2 MPa,温度为室温;燃烧室总余气系数为 8.0,工作压力为 0.3～ 0.88MPa。实验结果表明 :主燃区烟粒浓度和火焰辐射随压力增加呈急剧增加的趋势,但其增加的速率是随空气雾化喷嘴的吹气压力的增加而下降;在不同压力下,火焰总辐射沿火焰筒轴向长度呈明显减少的趋势,但在较高压力情况下 (如 pc≥ 0.5 MPa )主要由大量烟粒被氧化消失引起的,而在较低压力情况下(如 pc≤ 0.3 MPa )则主要是由气体辐射的减少造成的。

EFFECT OF PRESSURE ON SOOT CONCENTRATION AND FLAME RADIATION IN A SMALL MODEL GAS TURBINE COMBUSTOR WITH AN AIR-BLAST ATOMIZER

The effect of combustor pressure on soot concentrati on and flame radiation was investigated in a small model gas turbine combustor with an air-blast atomizer. Experimental results showed that the soot concentration and flame radiation in the primary zone increase rapidly with the increasing combustor pressure; however, its increasing rate is reduced as the pressure of the blast air is increased. Flame rediation along the axial length of the fla me tube decreases at different pressures, which is more apparent at higher pressures. The decrease is mainly caused by fast soot oxidation along the axial length of the flame tube at higher pressures, and substantially produced by the reduction of gas radiation at lower pressures.