1. TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri Rotating Turbine Rig, Heat Transfer, Film Cooling Facility: A new two-loop turbine specially designed for Film cooling/heat tarassfer measurement under rotating condition. Instrumentation used: Pressure Sensitive paints (PSP) for film cooling effectiveness measurement Temperature sensitive paints (TSP) for heat transfer measurement

2. TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri Rotating Turbine Rig, Aero-Performance Research Capability Following figures give you an idea about the rotating turbine Aero-performance research capability The turbine facility is designed to address aerodynamics, heat transfer and performance issues under rotating condition. The facility with its components is shown below schematically.

3. Turbine Rotor Specially Designed for Heat Transfer and Film Cooling Rotor has two loops: an Internal cooling loop for purge flow through an inclined circumferential slot and an external loop for platform film cooling/heat transfer Experiments.. TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

4. Coolant Injection Through Gap Cross sectional view of the slot ahead of the 1 st stage rotor Coolant enters the plenum through the hollow shaft and exits the slot at 25º to the horizontal. TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

5. Coolant Injection Film Cooling Holes on Hub Platform Turbine 1 st Stage Rotor platform and Flow Schematics Downstream Film Cooling Holes Injection Coolant injection from discrete Holes STATOR ROTOR Stator Rotor u Passage Vortex GAPGAP TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

6. Using Pressure Sensitive Paints (PSP) for Film Cooling Effectiveness Measurement Block diagram of the experimental facility TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

7. PSP - Calibration Fig. 6 Calibration Curve for PSP Calibration for Temp. range = 22.2 o C to 60.1 o C Thermocouple Vacuum Chamber Vacuum Pump Red light emitted from PSP Green light to excite PSP PC PSP coated test sample Strobe light Camera Heater for Temperature Control TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

8. Boundary Condition and Sample Results  1st Rotor  Inlet Velocity = 35.8 m/s  Inlet Mach Number = 0.1  Inlet Temperature = 46°C Turbine Stage Operating Conditions  Exit Velocity = 107 m/s  Exit Mach Number = 0.3  Exit Temperature = 43°C  Re = 2.0*10 5 (axial chord length and exit velocity)  Inlet Total – to – Exit Pressure Ratio = 1.4  Angular Velocity = 2400 rpm, 2550 rpm, 3000 rpm  Stator-Rotor Ejection: Cooling Flow ~ 0.5% to 2% of Mainstream  Platform Film Cooling: Blowing Ratio (M=  c V c /  ∞ V ∞ ) ~ 0.5 to 2  Density Ratio (DR=  c /  ∞ ) = 1 (N 2 Injection) TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

9. Results Measured Film Cooling Effectiveness on the Rotating Platform using PSP – Downstream Discrete Hole Injection 2400 rpm Pitchwise Averaged Film Cooling Effectiveness at 2400rpm – Effect of Blowing ratio SS PS SS PS SS PS SS PS SS PS SS PS M=0.75 M=1.00 M=1.25 M=1.50 M=1.75 M=2.00 M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms) TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

10. Results Measured Film Cooling Effectiveness on the Rotating (Reference Point) Platform using PSP – Downstream Discrete Hole Injection 2550 rpm Pitchwise Averaged Film Cooling Effectiveness at 2550rpm – Effect of Blowing ratio SS PS SS PS SS PS SS PS SS PS SS PS M=0.75 M=1.00 M=1.25 M=1.50 M=1.75 M=2.00 M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms) TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

11. Results Measured Film Cooling Effectiveness on the Rotating Platform using PSP – Downstream Discrete Hole Injection 3000 rpm SS PS SS PS SS PS SS PS SS PS SS PS M=0.75 M=1.00 M=1.25 M=1.50 M=1.75 M=2.00 Pitchwise Averaged Film Cooling Effectiveness at 3000rpm – Effect of Blowing ratio M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms)

12. Results Pitchwise Averaged Film Cooling Effectiveness on the Rotating Platform using PSP – Downstream Film Cooling Hole Injection Pitchwise Averaged Film Cooling Effectiveness– Effect of Rotor Speed M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms)

13. Results Measured Film Cooling Effectiveness on the Rotating Platform using PSP – Upstream Stator- Rotor Injection Through Circumferential Slot Only 2400 rpm 2550 rpm 3000 rpm TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

14. Combination of Slot and Hole Injections Turbine 1 st Stage Rotor platform and Flow Schematics for Combined Upstream Stator- Rotor Gap Injection and Downstream Film Cooling Holes Injection Coolant injection through Stator-Rotor Seal Coolant injection from discrete holes STATOR ROTOR Stator Rotor u Passage Vortex GAPGAP TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

15. Results Measured Film Cooling Effectiveness on the Rotating Platform using PSP – Combined Upstream Stator- Rotor Gap Injection and Downstream Film Cooling Hole Injection 2400 rpm SS PS MFR=1.00% M=0.75 SS PS MFR=1.00% M=1.00 SS PS MFR=1.00% M=1.25 Pitchwise Averaged Film Cooling Effectiveness at 2400rpm – Effect of Blowing ratio M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms) TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri

16. Results Measured Film Cooling Effectiveness on the Rotating Platform using PSP – Combined Upstream Stator- Rotor Gap Injection and Downstream Film Cooling Hole Injection 3000 rpm SS PS MFR=1.00% M=0.75 SS PS MFR=1.00% M=1.00 SS PS MFR=1.00% M=1.25 Pitchwise Averaged Film Cooling Effectiveness at 3000rpm – Effect of Blowing ratio M=ρ c V c / ρ ∞ V ∞ ; MFR=(ms c / ms) TPFL: The Turbomachinery Performance and Flow Research Laboratory Texas A&M University M. T. Schobeiri