1 200 mm末级超长叶片全三维工程设计的数值研究

采用汽轮机全三维粘性流场计算程序，通过优化匹配静、动叶和合理选择流道内的各项气动参数，成功地完成了全速机组超长1200mm末级叶片的工程设计。对设计结果的数值验证表明，后加载的弯扭静叶片使得流道内的流动均匀加速，从而减小叶型与二次流损失，并为动叶提供优化设计方案。在动叶下半部分采用后部加载叶型，在上半部分采用专门设计的超音速叶型，可降低激波及激波与边界层相互作用损失。

Numerical Study of a Full Three-dimensional Engineering Design of 1200 mm Super-long Last Stage Blades

With the adoption of a calculation program for a full three-dimensional viscous flow field and through an optimized matching of rotating and stationary blades as well as a rational selection of various aerodynamic parameters in flow passages, an engineering design of 1200 mm super-long last stage blades for a full-speed steam turbine unit has been successfully completed. The numerical verification of test results shows that the rear-loaded twisted and bent stator blades enable the steam flow in the passage to be accelerated uniformly, thus reducing the profile and secondary flow losses and providing rotor blades with optimized design schemes. The use of rear-loaded blade profiles at their lower half part of rotor blades and the use of specially designed supersonic blade profiles at their upper half part can reduce the losses caused by mutual reaction between shock waves and that between shock waves and boundary layers.