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为研究水蒸气的混入对实际工作条件下的涡轮发动机燃烧室流场及NOx排放分布影响,采用Laminar flamelet燃烧模型对不同水蒸气含量下的煤油燃烧进行三维数值模拟。湍流及燃烧模型采用DLR-A湍流非预混射流火焰模型实验进行校验。燃烧室的计算结果表明,水蒸气的混入会减少燃烧室高温火焰燃烧区的尺寸和温度,流场的构型变化不大。通过OH基的组分分布及含量变化分析可知,在本文计算参数范围内,水蒸气会促使燃烧反应向下游移动。在起飞工作条件下,水蒸气进入燃烧室时其组分稀释及热沉为主要作用,化学反应的促进燃烧放热相对较小。当水蒸气的质量分数达到15%时,可减少约95%的NOx排放量。
In order to study the influence of water vapor mixing on the flow field and NOx emission distribution of turbine engine combustor under actual operating conditions, Laminar flamelet combustion model was used to simulate the three-dimensional combustion of kerosene under different water vapor contents. Turbulence and combustion models were calibrated using a DLR-A turbulent non premixed jet flame model experiment. The calculation results of the combustion chamber show that the mixing of water vapor reduces the size and temperature of the high temperature flame combustion zone, and the configuration of the flow field does not change much. According to the analysis of the distribution and content change of OH groups, water vapor will promote the combustion reaction to move downstream in the range of parameters calculated in this paper. Under the working conditions of take-off, when the water vapor enters the combustion chamber, its component dilution and heat sink are the main functions, and the chemical reaction promotes the combustion heat release relatively small. When the mass fraction of water vapor reaches 15%, about 95% of NOx emissions can be reduced.