某长外涵道形式的尾喷管特性数值计算分析

Numerical calculation and characteristic analysis of a certain nozzle with long bypass duct

为了获取用于飞行推力确定的尾喷管特性,利用全三维CFD仿真计算得到了某国产小型分开排气涡扇发动机的尾喷管流量系数和推力系数随外流马赫数、内外涵进口总压比、喷管落压比的变化关系。计算结果表明,尾喷管特性变化趋势合理,可为该型国产发动机飞行推力确定提供依据,对研究带长外涵道型尾喷管内外涵耦合影响分析具有重要意义。

In order to obtain the characteristics of the nozzle for in -flight thrust determination, using 3D CFD simulation, the change regulations of the nozzle flow coefficient and thrust coefficient of a small turbofan engine were obtained,with the change of the flight Maeh number, total pressure ratio of internal and external duct and nozzle pressure ratio. The calculation results showed that the variation trend of the nozzle characteristics is reasonable, which can provide a basis for determining the flight thrust of the domestic engine. It is of great significance for the study of coupling relationship between internal and external duct of the nozzle with long bypass duct.