入口流量分配对超紧凑级间燃烧室性能的影响

对超紧凑级间燃烧室入口的流量分配进行了优化分析.首先基于化学反应模拟软件Chemkin,建立了航空煤油RP3/空气的小型级间燃烧室性能简化分析方法,并利用现有实验数据对其进行了验证.选取了入口主流流量/腔体流量分别为60/40，65/35，70/30，75/25，80/20五种分配方案,利用简化分析模型对各分流方案进行了对比研究,主要关注出口温度、燃烧效率和污染物排放的变化情况.结果表明:分流比为65/35时,燃烧效率相对于5种分流比中最高燃烧效率只下降0.249%,但NOx及CO排放均相对降低了50%以上.基于此研究方法得到的结论,可为超紧凑级间燃烧室设计初期的分流方案选取提供依据和性能简化分析方法. 

Performance of ultra compact inter turbine burner with different inlet mass flow splits

An optimization analysis of inlet mass flow splits of ultra compact inter turbine burner was introduced. The combustion performance in a small scale inter turbine burner was numerically analyzed using Chemkin software, and a detail kerosene RP 3/air mechanism was used. Numerical results were qualitatively validated with the existing experimental data with respect to the combustion performance. Five split ratios of the core mass flow rate to cavity mass flow rate, 60/40, 65/35, 70/30, 75/25 and 80/20, were adopted to contrastively study the outlet temperature, combustion efficiency and pollutant emission using the simplified model. The results show that the combustion efficiency of the split ratio 65/35 decreasesd by 0249% compared with the highest efficiency among the five split ratios, but the NOx and CO emissions both decrease more than 50%. The conclusion based on this method can provide a basis for evaluating an optimum mass flow split at the design stage of ultra compact inter turbine burner as well as for simplified performance analysis.