Direct Numerical Simulations of a High-Pressure Turbine Vane

In this paper we establish a benchmark data set of a generic high-pressure turbine vane generated by direct numerical simulation (DNS) to resolve fully the flow. The test conditions for this case are a Reynolds number of 0.57 million and an exit Mach number of 0.9, which is representative of a modern transonic high-pressure turbine vane. In this study we first compare the simulation results with previously published experimental data. We then investigate how turbulence affects the surface flow physics and heat transfer. An analysis of the development of loss through the vane passage is also performed. The results indicate that free-stream turbulence tends to induce streaks within the near wall flow, which augment the surface heat transfer. Turbulent breakdown is observed over the late suction surface, and this occurs via the growth of two-dimensional Kelvin-Helmholtz spanwise roll-ups, which then develop into lambda vortices creating large local peaks in the surface heat transfer. Turbulent dissipation is found to significantly increase losses within the trailing-edge region of the vane.

[1]  R. Lewis,et al.  Low-storage, Explicit Runge-Kutta Schemes for the Compressible Navier-Stokes Equations , 2000 .

[2]  Liwei Chen,et al.  Assessing the sensitivity of turbine cascade flow to inflow disturbances using direct numerical simulation , 2012 .

[3]  Richard D. Sandberg,et al.  DNS OF COMPRESSIBLE PIPE FLOW EXITING INTO A COFLOW , 2012, Proceeding of Seventh International Symposium on Turbulence and Shear Flow Phenomena.

[4]  Bryan E. Richards,et al.  Short Duration Measurements of Heat-Transfer Rate to a Gas Turbine Rotor Blade , 1982 .

[5]  Richard D. Sandberg,et al.  Numerical investigation of turbulent supersonic axisymmetric wakes , 2012, Journal of Fluid Mechanics.

[6]  Roger W. Ainsworth,et al.  Unsteady Heat Transfer Measurements from Transonic Turbine Blades at Engine Representative Conditions in a Transient Facility , 2008 .

[7]  K. Dullenkopf,et al.  A Theory for Wake-Induced Transition , 1989 .

[8]  Karen A. Thole,et al.  Detailed Boundary Layer Measurements on a Turbine Stator Vane at Elevated Freestream Turbulence Levels , 2001 .

[9]  Michael G. Dunn,et al.  Convective Heat Transfer and Aerodynamics in Axial Flow Turbines , 2001 .

[10]  Richard D. Sandberg,et al.  DIRECT NUMERICAL SIMULATIONS OF A TRANSONIC TIP FLOW WITH FREE-STREAM DISTURBANCES , 2013 .

[11]  Neil D. Sandham,et al.  Direct numerical simulation of ‘short’ laminar separation bubbles with turbulent reattachment , 2000, Journal of Fluid Mechanics.

[12]  Christopher A. Kennedy,et al.  Reduced aliasing formulations of the convective terms within the Navier-Stokes equations for a compressible fluid , 2008, J. Comput. Phys..

[13]  John D. Denton,et al.  The 1993 IGTI Scholar Lecture: Loss Mechanisms in Turbomachines , 1993 .

[14]  R. G. Jacobs,et al.  Simulations of bypass transition , 2001, Journal of Fluid Mechanics.

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

[16]  W. Rodi,et al.  Direct numerical simulation of flow and heat transfer in a turbine cascade with incoming wakes , 2006, Journal of Fluid Mechanics.

[17]  Karen A. Thole,et al.  Effects of Large Scale High Freestream Turbulence and Exit Reynolds Number on Turbine Vane Heat Transfer in a Transonic Cascade , 2009 .

[18]  Michael G. Dunn,et al.  Aerodynamic and Heat-flux Measurements with Predictions on a Modern One and One-Half State High Pressure transonic Turbine , 2005 .

[19]  Richard D. Sandberg,et al.  DNS of a canonical compressible nozzle flow , 2011 .

[20]  Karen A. Thole,et al.  Flowfield Measurements for a Highly Turbulent Flow in a Stator Vane Passage , 2000 .

[21]  Neil D. Sandham,et al.  Direct Numerical Simulation of Turbulent Flow over a Rectangular Trailing Edge , 2001 .

[22]  Nicolas Gourdain,et al.  Application of RANS and LES to the Prediction of Flows in High Pressure Turbine Components , 2011 .

[23]  Nicolas Gourdain,et al.  RANS and LES for the Heat Transfer Prediction in Turbine Guide Vane , 2012 .

[24]  Charles W. Haldeman,et al.  Heat-Transfer Measurements and Predictions for the Vane and Blade of a Rotating High-Pressure Turbine Stage , 2004 .

[25]  Howard P. Hodson,et al.  Boundary Layer and Loss Measurements on the Rotor of an Axial-Flow Turbine , 1984 .

[26]  Richard D. Sandberg,et al.  Nonreflecting Zonal Characteristic Boundary Condition for Direct Numerical Simulation of Aerodynamic Sound , 2006 .

[27]  M. L. G. Oldfield,et al.  Heat Transfer Optimized Turbine Rotor Blades—An Experimental Study Using Transient Techniques , 1984 .

[28]  T. V. Jones,et al.  High Frequency Surface Heat Flux Imaging of Bypass Transition , 2005 .

[29]  Tony Arts,et al.  Unsteady Rotor Heat Transfer in a Transonic Turbine Stage , 2002 .

[30]  Thomas E. Diller,et al.  Simultaneous Heat Flux and Velocity Measurements in a Transonic Turbine Cascade , 2005 .

[31]  Robert Haimes,et al.  Fully Scaled Transonic Turbine Rotor Heat Transfer Measurements , 1988 .

[32]  Richard D. Sandberg,et al.  Compressible DNS of a Low Pressure Turbine Subjected to Inlet Disturbances , 2015 .