In the present study an application for efficient cooling of turbine liner segments employing pulsating impinging jets was investigated. A combined numerical and experimental study was conducted to evaluate the design of a case cavity device which utilizes the periodically unsteady pressure distribution caused by the rotor blades to excite a pulsating impinging jet. Through an opening between the main annulus and a case cavity, pressure pulses from the rotor blades propagated into this cavity and caused a strong pressure oscillation inside. The unsteady CFD results were in good qualititative agreement with the measurement data obtained using high frequency pressure transducers and hot wire anemometry. Furthermore, the numerical study revealed the formation of distinct toroidal vortex structures at the nozzle outlet as a result of the jet pulsation. Within the scope of the measurements the influence of the operating point on the pressure propagation inside the cavity was investigated. The dependence of shape and amplitude of the pressure oscillation on engine speed and stage pressure ratio was found to be in accordance with an analytical consideration.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5673-4
PROCEEDINGS PAPER
Blade Triggered Excitation of Periodically Unsteady Impinging Jets for Efficient Turbine Liner Segment Cooling Available to Purchase
Christian Scherhag,
Christian Scherhag
Technische Universität Darmstadt, Darmstadt, Germany
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Jan Paul Geiermann,
Jan Paul Geiermann
Technische Universität Darmstadt, Darmstadt, Germany
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Fabian Wartzek,
Fabian Wartzek
Technische Universität Darmstadt, Darmstadt, Germany
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Heinz-Peter Schiffer
Heinz-Peter Schiffer
Technische Universität Darmstadt, Darmstadt, Germany
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Christian Scherhag
Technische Universität Darmstadt, Darmstadt, Germany
Jan Paul Geiermann
Technische Universität Darmstadt, Darmstadt, Germany
Fabian Wartzek
Technische Universität Darmstadt, Darmstadt, Germany
Heinz-Peter Schiffer
Technische Universität Darmstadt, Darmstadt, Germany
Paper No:
GT2015-43497, V05CT18A004; 14 pages
Published Online:
August 12, 2015
Citation
Scherhag, C, Geiermann, JP, Wartzek, F, & Schiffer, H. "Blade Triggered Excitation of Periodically Unsteady Impinging Jets for Efficient Turbine Liner Segment Cooling." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5C: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05CT18A004. ASME. https://doi.org/10.1115/GT2015-43497
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