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选用了两个实际透平叶片MARKⅡ静叶和某高压透平静叶,前者为光滑叶片,后者为表面覆盖有圆台的粗糙表面叶片.利用CFD数值模拟技术对叶栅流道特性和叶片表面换热分布进行数值模拟计算,数值计算结果与实验结果对比验证了数值方法的可靠性.研究表明,准确预测转捩位置和选取合适的y+值是计算叶片表面换热特性的关键,剪切应力输运(SST)转捩模型预测的结果最令人满意.在粗糙叶片表面数值计算中,对表面粗糙度模型进行验证,然后详细分析了污垢沉积对叶片表面换热的影响.结果表明:随着叶片表面粗糙度的增大,叶片近壁面湍流增强,叶片的表面传热系数增大.
Two real turbine blades, MARK II vanes and a high-pressure turbine stator vane were used, the former being smooth vanes and the latter being rough surface vanes covered with truncated conical surfaces.Through CFD numerical simulation, The results of numerical calculation and experimental results verify the reliability of the numerical method.The results show that accurately predicting the rotation position and selecting the appropriate y + value are the key points for calculating the heat transfer characteristics of the blade surface. The results of SST transition model are the most satisfactory. In the calculation of rough blade surface, the surface roughness model is verified, and then the effect of soil deposition on the surface heat transfer is analyzed in detail. The results show that with the The increase of blade surface roughness, the turbulence near the wall of the blade increased, and the surface heat transfer coefficient of the blade increased.