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为快捷有效地计算涡轮叶片双层壁复合冷却结构的冷却特性,将一套适用于气冷叶片换热模拟的管网耦合算法应用于所设计的双层壁内冷叶片上.结合冷却流路的一维管道网络算法以及壁面单元与对应外流场网格间的插值过程,形成HIT3D-Coolnet管网耦合程序,并参考有测量数据的涡轮叶片算例验证其模拟有效性.针对新型的双层壁冷却结构,在已有叶型的基础上初步构建3种配气方式的复合冷却方案.用HIT3D-Coolnet快速得到叶片外壁温度信息以甄选初始方案,借助全三维数值模拟分析初选方案双层壁结构内的流动特性,并据此采取措施改善初始设计.流场分析表明,导入腔内的冷却空气冲击腔壁,并在腔室空间内形成特定的旋涡结构,有效地强化了内部对流换热.在合理的冷气分配下,双层壁冷却技术可获得较好的冷却效果.
In order to calculate the cooling characteristics of the double-walled composite cooling structure of the turbine blade quickly and effectively, a set of pipe network coupling algorithm suitable for the simulation of the air-cooled blade heat exchange is applied to the double- Dimensional pipeline network algorithm and the interpolation process between the wall element and the corresponding outflow field grid to form the HIT3D-Coolnet pipe network coupling program and validate its simulation validity by referring to the turbine blade with measured data.According to the new double Based on the existing leaf pattern, three kinds of compound cooling schemes of gas distribution were preliminarily constructed.Using HIT3D-Coolnet, the outer wall temperature information of the leaf was quickly obtained to select the initial scheme, and the full three-dimensional numerical simulation was used to analyze the primary scheme double The flow characteristics in the wall structure and the measures taken to improve the initial design.Flow field analysis shows that the cooling air introduced into the cavity impinges on the cavity wall and forms a specific vortex structure in the cavity space and effectively strengthens the internal convection Heat transfer. In a reasonable air-conditioning distribution, double wall cooling technology can get better cooling effect.