气冷涡轮叶片气热耦合数值模拟研究

Coupling numerical simulation of heat-flow characteristics of the turbine blade with internal cooling

采用气热耦合计算方法进行气冷涡轮气动性能-传热分析,这种方法无需指定对流换热系数和热流密度等经验参数,只须要给出气流与固体之间的流动换热物理条件。利用该方法对某三维涡轮导叶进行数值模拟,计算结果表明,气热耦合计算的叶片温度场更接近真实情况,针对该叶片尾缘烧蚀问题,利用气热耦合计算方法,研究了叶片尾缘冷却设计方案,通过对在尾缘开缝冷却方案的分析计算,结果表明,该设计方案可以使得尾缘最高温度下降了130K。

A new method heat-flow coupling simulation is developed. It eliminates the need to specify the temperatures and the heat fluxes, only need to give the boundary conditions. Using this method, a 3D turbine blade with internal cooling has been studied successfully. The results demonstrate that heat-flow coupling is more feasible compare to the traditional method. In order to protect the trailing edge ablated, a coolant slot is applied in this blade. It is shown that this slot could decrease blade trailing edge temperature by 130 degrees.