为了使应用于燃气轮机的单管微混燃烧器实现清洁燃烧，达到降低污染的效果，采用数值模拟的方法，从影响单管微混燃烧器燃/空掺混均匀性的几何参数入手，分析了几何参数与掺混均匀性的问题，研究了微混燃烧器中非反应流动以及燃/空分配对掺混均匀性的影响，形成了单喷嘴微混设计方案。三维模拟模型基于如下设计参数建立：空气孔径Da为2~5 m、空气孔间距S为5~11 m、第1排空气孔与燃料主流入口平面距离L1为3~35 m、流速V为50~70 s。结果表明：混合质量并不直接取决于空气孔直径Da的大小，而是与燃空射流动量比有关；空气孔间距S对均匀度的影响较小，且与最短预混段长度L呈三次多项式的关系；L1的长度与预混段长度在给定区间内呈现四次多项式的关系；流速V、空气孔直径Da、射流深度H三者可呈现出一个函数关系，可由已知量推测未知量的范围。基于上述研究结果，在合适的几何尺寸下，单管微混燃烧器可以得到较高的混合质量，压损较小的情况下，使燃/空掺混均匀性更好。

In order to make the single tube micro mixing burner used in gas turbine realize clean combustion and reduce pollution, starting with the geometric parameters affecting the fuel/air mixing uniformity of single tube micro mixing burner, the problems of geometric parameters and mixing uniformity were analyzed, and the effects of nonreactive flow and fuel/air distribution on mixing uniformity in micro mixing burner were studied, and the single nozzle micro mixing design scheme was formed by numerical simulation method.The threedimensional simulation model was established based on the following design parameters: air hole diameter Da of 2 mm to 5 mm, air hole spacing S of 5 mm to 11 mm,plane distance L1 of 3 mm to 35 mm between the first row of air holes and the fuel mainstream inlet, and flow velocity V of 50 m/s to 70 m/s.The results show that the mixing quality does not directly depend on the diameter Da of the air hole, but on the momentum ratio of fuel/air jet flow;the air hole spacing S has little effect on the uniformity, and has a cubic polynomial relationship with the shortest premixed section length L; the relationship between the lengths of L1 and premixed section is a quartic polynomial in a given interval; there is a functional relationship among velocity V,air hole diameter Da and jet flow depth H,and the range of unknown quantity can be inferred from the known quantity.Based on the above research results,the single tube micro mixing burner with the appropriate geometric size can obtain higher mixing quality,so that the fuel/air mixing uniformity is better under the condition of small pressure loss.

TK471

国家科技重大专项（2019-Ⅲ-0018-0062)