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

作　　者：Prathapanayaka Rajeevalochanam S.N.Agnimitra Sunkara Seepana Venkata Ramana Murthy R.Senthil Kumaran 

机构地区：[1]Propulsion Division,CSIR-National Aerospace Laboratories,Bangalore,Karnataka,560017,India [2]Turbine Group,Gas Turbine Research Establishment,DRDO,Bangalore.Karnataka,560093,India

出　　处：《Propulsion and Power Research》2020年第3期225-239,共15页推进与动力（英文）

基　　金：Authors acknowledge GATET-GTRE,DRDO,India forthe financial assistance in this project;Authors would like tothank Director and Head-Propulsion Division of CSIR-NAL for their support in carrying out this work;Authorsalso thank‘Turbine Group-GTRE’and Versatile Turbine Test Rig team members.

摘　　要：Contra-rotating turbines offer enhanced performance over their conventional corotating 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.

关 键 词：Contra-rotating turbine Computational fluid dynamics Vaned contra-rotating Two spool Unsteady CFD 

分 类 号：TK1[动力工程及工程热物理—热能工程]