为了综合考察燃气轮机燃烧室在高稳定性、低排放以及燃料适应性等方面的新要求，基于旋流预混燃烧技术，通过三维数值模拟方法开展了甲烷/空气、丙烷/空气预混燃烧特性及排放特性研究。结果表明：在一定的预混气进气质量流量条件下，当量比增大易引发回火，燃烧温度更高，同时NOx排放指数增大，增加预混气质量流量，可在一定程度上提高回/熄火极限；当量比固定，增加预混气进气质量流量可避免潜在的回火现象，且NOx排放指数线性降低；旋流器的旋流数增大能形成强旋流，稳定火焰，降低NOx排放指数，但过大的旋流强度会引发回火现象；相比于甲烷/空气预混燃烧，丙烷/空气预混燃烧温度偏高，NOx排放指数较大，但回熄火边界更宽，对应更广阔的稳定燃烧区间。

In order to comprehensively investigate the new requirements of gas turbine combustors in terms of high stability, low emissions and fuel adaptability, the methane/air and propane/air premixed combustion and emissions characteristics were studied through threedimensional numerical simulation based on swirl premixed combustion technology. The results show that the increase of equivalence ratio will lead to flashback under certain airintake mass flow rate of premixed air, the NOx emission index increases due to higher combustion temperature, and the flashback/flameout limit tends to extend under higher premixed air mass flow rate; under constant equivalence ratio, potential flashback phenomenon will be avoided by increasing airintake mass flow rate of premixed air, and the emission index decreases linearly; the increment of swirl number can generate strong swirl to stabilize flame and reduce NOx emission index, but excessive swirl intensity will lead to flashback; compared with methane/air premixed combustion, propane/air premixed combustion temperature is higher and NOx emission index is bigger, but the boundary between flashback and flameout is wider, corresponding to wider stable combustion region.

TK16

国家自然科学基金（51576159）