以单头部中心分级旋流干式低排放(Dry Low Emission， DLE)燃烧室为研究对象，以天然气为燃料，针对不同的全局当量比、进口温度、进口压力条件开展试验测试和数值模拟，研究燃烧室的燃烧性能以及污染物排放的变化规律。研究发现：随全局当量比增大，中心回流区长度略有增大、宽度变窄、回流速度增大，燃料量的增加使得高温区面积明显扩大，燃烧室出口温升明显增大，出口温度分布系数变化不大，燃烧室出口CO和NOx排放摩尔分数明显增大；随进口温度的增大，中心回流区长度先明显增大再减小、宽度变窄、回流速度先增大再减小，进口空气温度的升高使得反应速率加快从而导致燃烧室出口温度升高，但温升、出口温度分布系数变化不大，CO和NOx排放摩尔分数增大；随进口压力的增大，中心回流区长度、宽度略有增大，回流速度增大，燃烧室内部和燃烧室出口温度无明显变化，出口温度分布系数减小，CO和NOx排放摩尔分数受影响较小

Combustion performance and pollutant emissions of a dry low emission (DLE) combustion chamber with a single dome centred on a graded cyclone and natural gas serving as its fuel, were studied by experiments and simulations under different global equivalent ratios, inlet temperatures and inlet pressures. Results show that central recirculation zone becomes slightly longer and narrower with the increase of the global equivalent ratio. Simultaneously, the recirculation velocity increases and the high temperature zone expands due to the increase of fuel amount. The temperature rise, CO and NOx emission molar fraction at the outlet of the combustion chamber increase significantly while the outlet temperature distribution coefficient changes slightly; central recirculation zone length is first elongated and then shortened and width becomes narrow with the increase of the inlet temperature obviously. The recirculation velocity first increases and then decreases. The inlet air temperature rise makes the reaction rate quicken, leading to temperature rise at the outlet of the combustion chamber. However, the temperature rise and outlet temperature distribution coefficient remain almost unchanged. In addition, CO and NOx emission molar fraction increases; central recirculation zone slightly becomes longer and wider with the increase of the inlet pressure. The recirculation velocity increases remarkably. Temperature inside the combustion chamber and that at the outlet of the combustion chamber remain unchanged while the outlet temperature distribution coefficient decreases. CO and NOx emission molar fraction is little affected by the change of the inlet pressure.

V231.3

辽宁省教育厅面上项目（LJKMZ20220537）