Contra-rotating turbines offer enhanced performance over their conventional co-rotating configurations. In addition, vaneless contra-rotating turbine stages offer lesser stage length along with improved performance. Contra-rotating turbines with a vaned LP stages offer a controlled work-split between the stages over a wider range of operating conditions by maintaining inlet swirl to the second rotor. The objective of the present work is to design an equivalent vaned contra-rotating turbine for an existing co-rotating configuration of a two-spool turbo fan engine. The contra-rotating turbine is designed by retaining the existing flow path and HP turbine, and redesigning the LP turbine for fixed radial distributions of inlet total temperature, pressure and swirl. A comparative study between performance of the co-rotating and contra-rotating turbines is carried out for different speeds. Cascade testing of the LP stator and rotor mean sections was carried out to validate the analysis. The LP stage of contra-rotating turbine exhibits a performance improvement by 2% points at design point, as per flow predictions. The reduced flow deflection in stator row is the primary reason for significant reduction in profile and secondary losses in contra-rotating turbine, which contributed to the performance improvement. A significant reduction of 23% in blade weight and 45% in LP stator vane count is obtained.

相对旋转的涡轮机提供了优于其常规的同向旋转配置的性能。另外，无叶片反向旋转涡轮级具有更短的级长以及更高的性能。带叶片LP级的对转涡轮通过保持第二个转子的进气涡流，在较宽的运行条件范围内提供了各级之间的受控功分。本工作的目的是设计一种等效的带叶片的对置旋转涡轮机，用于两转子涡轮风扇发动机的现有同向旋转配置。对转涡轮的设计是保留现有的流路和高压涡轮，然后重新设计低压涡轮，以实现入口总温度，压力和涡流的固定径向分布。对不同转速的同向旋转和反向旋转涡轮之间的性能进行了比较研究。进行了LP定子和转子平均截面的级联测试以验证分析。根据流量预测，反向旋转涡轮的LP级在设计点的性能提高了2％。定子排中流动偏斜的减小是对向旋转涡轮机外形和次级损耗显着减小的主要原因，这有助于提高性能。叶片重量显着降低了23％，低压定子叶片数量降低了45％。根据流量预测，反向旋转涡轮的LP级在设计点的性能提高了2％。定子排中流量偏斜的减小是对向旋转涡轮机外形和次级损耗显着减小的主要原因，这有助于性能的提高。叶片重量显着降低了23％，低压定子叶片数量降低了45％。根据流量预测，反向旋转涡轮的LP级在设计点的性能提高了2％。定子排中流量偏斜的减小是对向旋转涡轮机外形和次级损耗显着减小的主要原因，这有助于性能的提高。叶片重量显着降低了23％，低压定子叶片数量降低了45％。