气冷涡轮气热耦合数值模拟

应用有限差分方法进行气冷涡轮气热耦合计算,研究了影响气热耦合计算精度的几个因素,包括:流场壁面附近的计算网格、湍流转捩模型以及能量方程中普朗特数的计算等。为了能够应用高精度离散格式,并加快计算速度,采用了气热耦合动力学的微分方程与相应的差分格式,采用了结构化网格。数值计算结果与试验进行对比表明,在流场壁面附近应采用正交性好的网格,并在计算中考虑转捩的影响;而普朗特数的变化对本次计算的影响不大。

Coupled heat transfer analysis of air cooling gas turbine

Coupled heat transfer simulations with a FDM coupled solver were carried out to study the factors effecting the coupled simulation accuracy.Such factors included numerical grids around the blade wall,the turbulence and transition models,and the variation of Pradtl number.The difference scheme corresponding to the conjugate heat transfer dynamics differential equation and structured grids were employed to ensure the computational accuracy and speed.The comparison between numerical results and the measured ones shows that the grids quality around the blade wall and the transition model are essential for the coupled heat transfer simulations,and that the variation of Prandtl number affects slightly on the numerical results.