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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。
The finite difference method is used to calculate the gas-air coupling of gas-cooled turbines. Several factors that affect the calculation accuracy of gas-heat coupling are studied, including the computational grid near the flow field, the turbulent transition model and the Prandtl number in the energy equation Calculation and so on. In order to be able to use high-precision discrete format and speed up the calculation, differential equations of the gas-heat coupling dynamics and the corresponding differential format are adopted, and a structured grid is adopted. Comparing the numerical results with the experimental results, it is suggested that a grid with good orthogonality should be adopted near the wall of flow field, and the influence of transition should be considered in the calculation. The change of Prandtl number has little effect on this calculation.