Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans

Reid Adam Berdanier, Iván Monge-Concepción, Brian F. Knisely, Michael David Barringer, Karen Ann Thole, Eric A. Grover

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    As engine development continues to advance toward increased efficiency and reduced fuel consumption, efficient use of compressor bypass flow, commonly used as cooling flow, becomes increasingly important. In particular, optimal use of compressor bypass flow yields an overall reduction of harmful emissions. The cooling flows used for cavity sealing between stages are critical to the engine and must be sufficiently maintained to prevent damaging ingestion from the hot gas path. To assess these cavity seals, the present study utilizes a one-stage turbine with true-scale engine hardware operated at enginerepresentative rotational Reynolds number and Mach number. Past experimental studies have made use of part-span rather than full-span blades to reduce flow rate requirements for the turbine test rig; however, such decisions raise questions about potential influences of the blade span on sealing effectiveness measurements in the rim cavity. For this study, a tracer gas facilitates measurements of sealing effectiveness in the rim cavity to compare measurements collected with full-span engine airfoils and simplified, part-span airfoils. The results from this study show sealing effectiveness does not scale as a function of relative purge flow with respect to main gas path flow rate when airfoil span is changed. However, scaling the sealing effectiveness for differing spans can be achieved if the fullypurged flow rate is known. Results also suggest reductions of purge flow may have a relatively small loss of seal performance if the design is already near a fully-purged condition. Rotor tip clearance is shown to have no effect on measured sealing effectiveness.

    Original languageEnglish (US)
    Title of host publicationTurbomachinery
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)9780791851005
    DOIs
    StatePublished - Jan 1 2018
    EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
    Duration: Jun 11 2018Jun 15 2018

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume2B-2018

    Other

    OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
    CountryNorway
    CityOslo
    Period6/11/186/15/18

    Fingerprint

    Stators
    Turbomachine blades
    Rotors
    Airfoils
    Engines
    Flow rate
    Seals
    Compressors
    Turbines
    Cooling
    Gas fuel measurement
    Gases
    Fuel consumption
    Mach number
    Reynolds number
    Hardware

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Berdanier, R. A., Monge-Concepción, I., Knisely, B. F., Barringer, M. D., Thole, K. A., & Grover, E. A. (2018). Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans. In Turbomachinery (Proceedings of the ASME Turbo Expo; Vol. 2B-2018). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2018-77105
    Berdanier, Reid Adam ; Monge-Concepción, Iván ; Knisely, Brian F. ; Barringer, Michael David ; Thole, Karen Ann ; Grover, Eric A. / Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans. Turbomachinery. American Society of Mechanical Engineers (ASME), 2018. (Proceedings of the ASME Turbo Expo).
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    abstract = "As engine development continues to advance toward increased efficiency and reduced fuel consumption, efficient use of compressor bypass flow, commonly used as cooling flow, becomes increasingly important. In particular, optimal use of compressor bypass flow yields an overall reduction of harmful emissions. The cooling flows used for cavity sealing between stages are critical to the engine and must be sufficiently maintained to prevent damaging ingestion from the hot gas path. To assess these cavity seals, the present study utilizes a one-stage turbine with true-scale engine hardware operated at enginerepresentative rotational Reynolds number and Mach number. Past experimental studies have made use of part-span rather than full-span blades to reduce flow rate requirements for the turbine test rig; however, such decisions raise questions about potential influences of the blade span on sealing effectiveness measurements in the rim cavity. For this study, a tracer gas facilitates measurements of sealing effectiveness in the rim cavity to compare measurements collected with full-span engine airfoils and simplified, part-span airfoils. The results from this study show sealing effectiveness does not scale as a function of relative purge flow with respect to main gas path flow rate when airfoil span is changed. However, scaling the sealing effectiveness for differing spans can be achieved if the fullypurged flow rate is known. Results also suggest reductions of purge flow may have a relatively small loss of seal performance if the design is already near a fully-purged condition. Rotor tip clearance is shown to have no effect on measured sealing effectiveness.",
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    Berdanier, RA, Monge-Concepción, I, Knisely, BF, Barringer, MD, Thole, KA & Grover, EA 2018, Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans. in Turbomachinery. Proceedings of the ASME Turbo Expo, vol. 2B-2018, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, Oslo, Norway, 6/11/18. https://doi.org/10.1115/GT2018-77105

    Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans. / Berdanier, Reid Adam; Monge-Concepción, Iván; Knisely, Brian F.; Barringer, Michael David; Thole, Karen Ann; Grover, Eric A.

    Turbomachinery. American Society of Mechanical Engineers (ASME), 2018. (Proceedings of the ASME Turbo Expo; Vol. 2B-2018).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    Berdanier RA, Monge-Concepción I, Knisely BF, Barringer MD, Thole KA, Grover EA. Scaling sealing effectiveness in a stator-rotor cavity for differing blade spans. In Turbomachinery. American Society of Mechanical Engineers (ASME). 2018. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT2018-77105