The application of pulsed vortex generator jets to control separation on the suction surface of a low pressure turbine blade is reported. Blade Reynolds numbers in the experimental, linear turbine cascade match those for high altitude aircraft engines and aft stages of industrial turbine engines with elevated turbine inlet temperatures. The vortex generator jets have a 30 degree pitch and a 90 degree skew to the freestream direction. Jet flow oscillations up to 100 Hz are produced using a high frequency solenoid feed valve. Results are compared to steady blowing at jet blowing ratios less than 4 and at two chordwise positions upstream of the nominal separation zone. Results show that pulsed vortex generator jets produce a bulk flow effect comparable to that of steady jets with an order of magnitude less massflow. Boundary layer traverses and blade static pressure distributions show that separation is almost completely eliminated with the application of unsteady blowing. Reductions of over 50% in the wake loss profile of the controlled blade were measured. Experimental evidence suggests that the mechanism for unsteady control lies in the starting and ending transitions of the pulsing cycle rather than the injected jet stream itself. Boundary layer spectra support this conclusion and highlight significant differences between the steady and unsteady control techniques. The pulsed vortex generator jets are effective at both chordwise injection locations tested (45% and 63% axial chord) covering a substantial portion of the blade suction surface. This insensitivity to injection location bodes well for practical application of pulsed VGJ control where the separation location may not be accurately known a priori.
Skip Nav Destination
ASME Turbo Expo 2000: Power for Land, Sea, and Air
May 8–11, 2000
Munich, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7856-9
PROCEEDINGS PAPER
Turbine Separation Control Using Pulsed Vortex Generator Jets
Jeffrey P. Bons,
Jeffrey P. Bons
Air Force Institute of Technology, Wright-Patterson AFB, OH
Search for other works by this author on:
Rolf Sondergaard,
Rolf Sondergaard
Air Force Research Laboratory, Wright-Patterson AFB, OH
Search for other works by this author on:
Richard B. Rivir
Richard B. Rivir
Air Force Research Laboratory, Wright-Patterson AFB, OH
Search for other works by this author on:
Jeffrey P. Bons
Air Force Institute of Technology, Wright-Patterson AFB, OH
Rolf Sondergaard
Air Force Research Laboratory, Wright-Patterson AFB, OH
Richard B. Rivir
Air Force Research Laboratory, Wright-Patterson AFB, OH
Paper No:
2000-GT-0262, V003T01A067; 10 pages
Published Online:
August 4, 2014
Citation
Bons, JP, Sondergaard, R, & Rivir, RB. "Turbine Separation Control Using Pulsed Vortex Generator Jets." Proceedings of the ASME Turbo Expo 2000: Power for Land, Sea, and Air. Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration. Munich, Germany. May 8–11, 2000. V003T01A067. ASME. https://doi.org/10.1115/2000-GT-0262
Download citation file:
40
Views
Related Proceedings Papers
Related Articles
Turbine Separation Control Using Pulsed Vortex Generator Jets
J. Turbomach (April,2001)
Separation Control on a Very High Lift Low Pressure Turbine Airfoil Using Pulsed Vortex Generator Jets
J. Turbomach (October,2011)
The Fluid Dynamics of LPT Blade Separation Control Using Pulsed Jets
J. Turbomach (January,2002)
Related Chapters
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies