涡扇发动机收敛排气系统进口总温总压对喷流中心线温度分布影响

为了在涡扇发动机总体设计阶段,建立红外辐射特征预测模型,通过计算流体动力学方法研究涡扇发动机排气系统进口总温总压对其喷流无量纲温度分布规律的影响,得到适合涡扇发动机总体设计阶段使用的计算喷流中心线上温度分布的经验公式.结果表明:喷流中心线上相同无量纲温度对应的无量纲距离与涡扇发动机排气系统内外涵进口总压、外涵总温成正比与内涵总温成反比.总结出的涡扇发动机喷流中心线上温度分布的计算经验公式与数值计算结果吻合较好. 

Influence of total temperature and pressure at the inlet of convergent exhaust system of turbofan engine on temperature distribution at plume centerline

During the overall process of designing the turbofan engine, the model for predicting the signature of infrared radiation was established.With the method for calculating the fluid dynamics, the influence of the total temperature and total pressure at the inlet of convergent exhaust system of turbofan engine on the temperature distribution at plume centerline was estimated; the overall process of designing the turbofan engine was required and the approximate formula for calculating the temperature distribution at plume centerline was achieved. The result shows that the dimensionless distance corresponding to the dimensionless temperature at plume centerline is proportional to the total pressure of the inner duct, the bypass duct and total temperature of the bypass duct at the inlet of convergent exhaust system of turbofan engine, but inversely proportional to the total temperature of the inner duct.Therefore, it can be concluded that the summed-up experience formula of temperature distribution at the plume centerline of turbofan engine agrees well with the numerical results.