防冰系统喷嘴结构对冷热空气掺混性能的影响

为了分析燃气轮机进气防冰系统的性能，降低过滤器烧伤的风险，针对某燃气轮机防冰系统，采用三维数值模拟方法探讨了不同的射流孔孔径、孔数以及不同引气流量条件下防冰热气与主流冷空气的掺混效果。计算结果展示了射流孔喷出的热气与主流冷空气的掺混现象及其向下游输运的整个过程，表明吹风比（Br）是影响热气与主流掺混的关键参数，减小射流孔孔径、增大引气流量都会提高射流孔Br，使热空气与主流冷空气掺混的更加均匀，而在射流孔孔径和引气流量不变的前提下，增加射流孔数目不会对掺混起到积极的作用。

Influence of Nozzle Structure of Anti-icing System on Mixing Performance of Cold and Hot Air

In order to analyze the performance of gas turbine inlet anti-icing system and reduce the risk of filter burn, the effects of different jet hole diameter, the number of holes and bleed air flow rate on the mixing effect of a gas turbine anti-icing system and mainstream were discussed by using three-dimensional numerical simulation method. The mixing phenomenon of bleed air ejected from jet holes with mainstream and the whole process of its downstream transportation are presented. Simulation result shows that blowing ratio (Br) is the key parameter affecting the mixing of hat gas and mainstream. Reducing jet hole diameter and increasing bleed air flow rate will increase Br both, and the hot bleed air and the mainstream cold air are mixed more evenly. When the jet hole diameter and the flow rate of bleed air remain unchanged, increasing the number of jet holes will not play a positive role in mixing.