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Design of a two spool contra-rotating turbine for a turbo-fan engine

Propulsion and Power Research 2020年第3期9卷 225-239页

作者： Prathapanayaka Rajeevalochanam S.N.Agnimitra Sunkara Seepana Venkata Ramana Murthy R.Senthil Kumaran Propulsion Division CSIR-National Aerospace LaboratoriesBangaloreKarnataka560017India turbine group Gas Turbine Research EstablishmentDRDOBangalore.Karnataka560093India

Contra-rotating turbines offer enhanced performance over their conventional corotating *** addition,vaneless contra-rotating turbine stages offer lesser stage length along with improved ***-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 *** 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 *** 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 *** testing of the LP stator and rotor mean sections was carried out to validate the *** LP stage of contra-rotating turbine exhibits a performance improvement by 2%points at design point,as per flow *** 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.

关键词： Contra-rotating turbine Computational fluid dynamics Vaned contra-rotating Two spool Unsteady CFD

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