Aerodynamic performance of a very high lift low pressure turbine blade with emphasis on separation prediction

The present paper is based on an experimental study of a front-loaded very high lift, low pressure turbine blade designed at the VKI. The experiments have been carried out in a low-speed wind tunnel over a wide operating range of incidence and Reynolds number. The aim of the study is to characterize the flow through the cascade in terms of losses, mean outlet flow angle, and secondary flows. At low inlet freestream turbulence intensity, a laminar separation bubble is present, and a prediction model for a separated flow mode of transition has been developed.

[1]  Stefan Brunner,et al.  Comparison of Two Highly Loaded Low Pressure Turbine Cascades Under the Influence of Wake-Induced Transition , 2000 .

[2]  L. Hultgren,et al.  MEASUREMENTS IN SEPARATED AND TRANSITIONAL BOUNDARY LAYERS UNDER LOW-PRESSURE TURBINE AIRFOIL CONDITIONS , 2000 .

[3]  R. E. Mayle,et al.  The 1991 IGTI Scholar Lecture: The Role of Laminar-Turbulent Transition in Gas Turbine Engines , 1991 .

[4]  Gregory J. Walker,et al.  The Role of Laminar-Turbulent Transition in Gas Turbine Engines: A Discussion , 1992 .

[5]  J. Hourmouziadis,et al.  Separation Bubbles Under Steady and Periodic-Unsteady Main Flow Conditions , 2000 .

[6]  W. B. Roberts.  The Effect of Reynolds Number and Laminar Separation on Axial Cascade Performance , 1975 .

[7]  Roddam Narasimha,et al.  The laminar-turbulent transition zone in the boundary layer , 1985 .

[8]  Ralph J. Volino,et al.  Separated Flow Transition Under Simulated Low-Pressure Turbine Airfoil Conditions: Part 2 — Turbulence Spectra , 2002 .

[9]  Howard P. Hodson,et al.  High Lift and Aft-Loaded Profiles for Low-Pressure Turbines , 2001 .

[10]  Ting Wang,et al.  A PREDICTION MODEL FOR SEPARATED-FLOW TRANSITION , 1999 .

[11]  Terrence W. Simon,et al.  Experimental investigation of transition as applied to low pressure turbine suction surface flows , 1997 .

[12]  H. E. Gallus,et al.  A Study on Models to Simulate Boundary Layer Transition in Turbomachinery Flows , 2000 .

[13]  M. Yaras,et al.  Measurements of the Effects of Pressure-Gradient History on Separation-Bubble Transition , 2001 .

[14]  R. Mayle,et al.  Transition in a Separation Bubble , 1995 .

[15]  M. Yaras,et al.  Measurements of the Effects of Freestream Turbulence on Separation-Bubble Transition , 2002 .

[16]  W. J. Solomon.  Effects of Turbulence and Solidity on the Boundary Layer Development in a Low Pressure Turbine , 2000 .

[17]  H. Schlichting.  Boundary Layer Theory , 1955 .

[18]  Tony Arts,et al.  Unsteady and Calming Effects Investigation on a Very High Lift LP Turbine Blade: Part I — Experimental Analysis , 2002 .

[19]  R. E. Mayle,et al.  The Role of Laminar-Turbulent Transition in Gas Turbine Engines , 1991 .