为掌握同轴分级燃烧室性能参数随空气分级比（主燃级空气流量的比值）的变化规律，以某同轴分级燃烧室为研究对象，数值分析了空气分级比对燃烧室的燃烧效率、总压损失、出口温度分布、污染物排放和绝热壁面最高温度的影响。结果表明：空气分级比主要会改变角涡位置的燃烧温度和高温烟气的停留时间；随着空气分级比的升高，燃烧室总压损失、出口温度分布系数、NOx排放、绝热壁面最高温度逐渐升高，但燃烧效率、CO污染物排放、径向温度分布系数对空气分级比不敏感；在同轴分级燃烧室设计中，在保证燃烧稳定的前提下可采用较小的空气分级比以实现燃烧室高效、低阻、低污染燃烧。

In order to confirm the variation law of coaxiallystaged combustor performance parameters with air staging ratio (i.e. the ratio of primary combustion stage air flow), taking a coaxiallystaged combustor as research object, numerical simulation was carried out to analyze the influence of air staging ratio on the performance of a model coaxiallystaged gas turbine combustor, such as the efficiency of combustion, total pressure loss, combustor outlet temperature distribution factor, pollutant emissions and maxium adiabatic temperature of combustor liner. Results show that air staging ratio can mainly change the combustion temperature of corner recirculation zones and the resistance time of hightemperature flue gas; increasing the air staging ratio will increase the total pressure loss, outlet temperature distribution factor, NOx emission and maximum adiabatic temperature of combustor liner, while combustion efficiency, CO emission, radial temperature distribution factor are not sensitive to air staging ratio; under the premise of ensuring flame stability, a smaller air staging ratio can be adopted to realize high combustion efficiency, low pressure loss and emissions when designing a coaxiallystaged combustor.

V231.2

国家科技重大专项(2017-Ⅲ-0006-0031，Y2019-I-0022-0021)