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 computational fluid dynamics (CFD) results were in good qualitative 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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Blade Triggered Excitation of Periodically Unsteady Impinging Jets for Efficient Turbine Liner Segment Cooling
Christian Scherhag,
Christian Scherhag
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: scherhag@glr.tu-darmstadt.de
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: scherhag@glr.tu-darmstadt.de
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Jan Paul Geiermann,
Jan Paul Geiermann
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
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Fabian Wartzek,
Fabian Wartzek
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
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Heinz-Peter Schiffer
Heinz-Peter Schiffer
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
Search for other works by this author on:
Christian Scherhag
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: scherhag@glr.tu-darmstadt.de
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: scherhag@glr.tu-darmstadt.de
Jan Paul Geiermann
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
Fabian Wartzek
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
Heinz-Peter Schiffer
Institute of Gas Turbines
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
and Aerospace Propulsion,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 9, 2015; final manuscript received November 13, 2015; published online January 20, 2016. Editor: Kenneth C. Hall.
J. Turbomach. May 2016, 138(5): 051005 (10 pages)
Published Online: January 20, 2016
Article history
Received:
November 9, 2015
Revised:
November 13, 2015
Citation
Scherhag, C., Geiermann, J. P., Wartzek, F., and Schiffer, H. (January 20, 2016). "Blade Triggered Excitation of Periodically Unsteady Impinging Jets for Efficient Turbine Liner Segment Cooling." ASME. J. Turbomach. May 2016; 138(5): 051005. https://doi.org/10.1115/1.4032145
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