论文部分内容阅读
本文目的在于验证所开发的适用于涡轮气热耦合模拟的计算程序,并研究转捩对气热耦合计算结果影响。首先在流场求解程序HIT-3D中加入考虑转捩影响的q-ω低雷诺数二方程模型以及AGS代数转捩模型模块,然后采用直接耦合方法关联HIT-3D与自主开发的温度场求解程序,使新程序具备气热耦合求解功能。选取MarkⅡ叶片的三个不同试验工况作为验证算例,在计算中考虑管内流动影响,并对流道内流动分别采用了B-L代数模型、q-ω二方程模型以及B-L&AGS模型,而对管内流动则分别采用了B-L模型与B-L&AGS模型。计算表明采用各模型预测的压力分布与试验吻合较好,而在层流转捩区域采用B-L&AGS模型预测的温度分布与实验吻合最好,而在湍流流动区域,各模型预测的温度分布接近。这一方面表明所开发程序具备较准确进行内冷涡轮气热耦合计算的能力,另一方面也证明了考虑转捩影响对提高气热耦合计算精度的重要性。
The purpose of this paper is to validate the developed computational program suitable for the gas-to-air coupling simulation of a turbine and investigate the effect of transition on the results of the coupling of gas and heat. Firstly, the q-ω low Reynolds number two-equation model and the AGS algebraic transition module model are considered in the flow solver HIT-3D, then the direct coupling method is used to correlate HIT-3D with the self-developed temperature field solver , So that the new program with air-heat coupling solution function. Three different test conditions of MarkⅡ leaf were selected as validation examples. In the calculation, the influences of the flow in the tube were considered. The BL algebraic model, the q-ω two-equation model and the B-L & AGS model were adopted for the flow in the flow channel respectively. The BL model and the B-L & AGS model are respectively used. The calculated results show that the pressure distributions predicted by each model are in good agreement with the experimental results. However, the temperature distribution predicted by the B-L & AGS model in the laminar transition zone is in good agreement with the experimental data, while the predicted temperature distribution in the turbulent flow region is similar. On the one hand, it shows that the developed program has the ability of more accurately calculating the COG of the COG and on the other hand, it proves the importance of considering the influence of the transition to improve the calculation accuracy of the COG.