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研究了用于航空发动机整机数值仿真的含粘性力项的二维欧拉流动模型,进行了整机流场数值仿真。用代数和椭圆形偏微分方程混合方法分别生成叶栅通道和燃烧室内贴体坐标网格;分别针对压气机转子、静子和涡轮叶栅,定义了三种不同损失系数;采用高阶精度Godunov格式和时间推进法,交替使用显/隐格式,收敛速度快,计算准确度高。计算了某双轴涡扇发动机设计点的整机性能与部件性能,计算结果与设计数据相吻合,分析整机仿真计算得出的流场参数分布,可以更好的了解流场细节。数值试验表明,建立的程序可以预测发动机稳态条件下的整机性能以及用于发动机的设计与改进,奠定了二维数值试验台建设的基础。
The two-dimensional Euler flow model with viscous force used in numerical simulation of aero-engine whole machine is studied and the flow field numerical simulation of the whole machine is carried out. The algebraic and elliptical partial differential equations are used to generate the grids of the cascade and the combustion body respectively. Three different loss coefficients are defined for the compressor rotors, the stator and the turbine cascade respectively. The high-order accuracy Godunov scheme And time to promote the law, alternating use of explicit / implicit format, convergence speed, high computational accuracy. Computational performance and component performance of a biaxial turbofan engine design point are calculated. The calculated results are consistent with the design data. Analyzing the parameter distribution of the flow field calculated by the whole machine simulation can better understand the details of the flow field. Numerical experiments show that the established program can predict the overall performance of the engine under steady-state conditions, as well as the design and improvement of the engine, laying the foundation for the construction of a two-dimensional numerical test rig.