Effect of Ingress on Flow and Heat Transfer Upstream and Downstream of a Rotating Turbine Disc

Hui Tang, GeonHwan Cho, Marios Patinios, James Scobie, Carl M. Sangan, J. Michael Owen, Gary D. Lock

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Ingress is the penetration of a hot mainstream gas in a turbine annulus through the rim seal into the wheel-space between the rotating turbine disc (the rotor) and the adjacent stationary casing (the stator). Purge flow is used to prevent or reduce ingress, and the sealing effectiveness relates the flow rates of the purge and ingress. In this paper, an adiabatic effectiveness is used to relate the temperatures of a thermally-insulated rotor, the purge flow and the ingress. A non-dimensional buffer parameter, Ψ, is used to relate the sealing effectiveness on the stator and the adiabatic effectiveness on the rotor, respectively. This paper reports the first experimental study of the effect of ingress and purge flow on the adiabatic temperatures of both upstream and downstream surfaces of the rotor. Measurements of concentration and swirl over a range of purge have been obtained in wheel-spaces upstream and downstream of the rotor in a turbine rig. In transient heating tests, fast-response thermocouples were used to measure the temperature of the air in the wheel-space core; simultaneously, the temperatures of the upstream and downstream rotor surfaces were determined from infra-red sensors. The extrapolated steady-state temperatures (obtained using a maximum-likelihood estimation analysis) were used to determine the adiabatic effectiveness as a function of purge flow rate. The buffer effect of the purge flow for both wheel-spaces was quantified via comparisons between the variation of Ψ with purge flow rate. It was shown that the sealing effectiveness for the downstream wheel-space was larger than for the upstream. Consequently, and consistent with the theoretical model, the buffering effect of the purge flow was shown to be smaller downstream
Originalspracheenglisch
Aufsatznummer49
Seitenumfang15
FachzeitschriftJournal of Aerospace Computing, Information, and Communication
Jahrgang6
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - Apr 2019

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Turbines
Rotors
Wheels
Heat transfer
Flow rate
Stators
Temperature
Maximum likelihood estimation
Thermocouples
Seals
Infrared radiation
Heating
Sensors
Air
Gases

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    Effect of Ingress on Flow and Heat Transfer Upstream and Downstream of a Rotating Turbine Disc. / Tang, Hui; Cho, GeonHwan; Patinios, Marios; Scobie, James; Sangan, Carl M.; Owen, J. Michael; Lock, Gary D.

    in: Journal of Aerospace Computing, Information, and Communication, Jahrgang 6, Nr. 5, 49, 04.2019.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Tang, Hui ; Cho, GeonHwan ; Patinios, Marios ; Scobie, James ; Sangan, Carl M. ; Owen, J. Michael ; Lock, Gary D. / Effect of Ingress on Flow and Heat Transfer Upstream and Downstream of a Rotating Turbine Disc. in: Journal of Aerospace Computing, Information, and Communication. 2019 ; Jahrgang 6, Nr. 5.
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    title = "Effect of Ingress on Flow and Heat Transfer Upstream and Downstream of a Rotating Turbine Disc",
    abstract = "Ingress is the penetration of a hot mainstream gas in a turbine annulus through the rim seal into the wheel-space between the rotating turbine disc (the rotor) and the adjacent stationary casing (the stator). Purge flow is used to prevent or reduce ingress, and the sealing effectiveness relates the flow rates of the purge and ingress. In this paper, an adiabatic effectiveness is used to relate the temperatures of a thermally-insulated rotor, the purge flow and the ingress. A non-dimensional buffer parameter, Ψ, is used to relate the sealing effectiveness on the stator and the adiabatic effectiveness on the rotor, respectively. This paper reports the first experimental study of the effect of ingress and purge flow on the adiabatic temperatures of both upstream and downstream surfaces of the rotor. Measurements of concentration and swirl over a range of purge have been obtained in wheel-spaces upstream and downstream of the rotor in a turbine rig. In transient heating tests, fast-response thermocouples were used to measure the temperature of the air in the wheel-space core; simultaneously, the temperatures of the upstream and downstream rotor surfaces were determined from infra-red sensors. The extrapolated steady-state temperatures (obtained using a maximum-likelihood estimation analysis) were used to determine the adiabatic effectiveness as a function of purge flow rate. The buffer effect of the purge flow for both wheel-spaces was quantified via comparisons between the variation of Ψ with purge flow rate. It was shown that the sealing effectiveness for the downstream wheel-space was larger than for the upstream. Consequently, and consistent with the theoretical model, the buffering effect of the purge flow was shown to be smaller downstream",
    keywords = "Turbine Disc, Ingress, Heat Transfer, Buffer Effect, Rim-Seals, Sealing effectiveness, Adiabatic Effectiveness, Adiabatic Rotor Temperature",
    author = "Hui Tang and GeonHwan Cho and Marios Patinios and James Scobie and Sangan, {Carl M.} and Owen, {J. Michael} and Lock, {Gary D.}",
    year = "2019",
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    TY - JOUR

    T1 - Effect of Ingress on Flow and Heat Transfer Upstream and Downstream of a Rotating Turbine Disc

    AU - Tang, Hui

    AU - Cho, GeonHwan

    AU - Patinios, Marios

    AU - Scobie, James

    AU - Sangan, Carl M.

    AU - Owen, J. Michael

    AU - Lock, Gary D.

    PY - 2019/4

    Y1 - 2019/4

    N2 - Ingress is the penetration of a hot mainstream gas in a turbine annulus through the rim seal into the wheel-space between the rotating turbine disc (the rotor) and the adjacent stationary casing (the stator). Purge flow is used to prevent or reduce ingress, and the sealing effectiveness relates the flow rates of the purge and ingress. In this paper, an adiabatic effectiveness is used to relate the temperatures of a thermally-insulated rotor, the purge flow and the ingress. A non-dimensional buffer parameter, Ψ, is used to relate the sealing effectiveness on the stator and the adiabatic effectiveness on the rotor, respectively. This paper reports the first experimental study of the effect of ingress and purge flow on the adiabatic temperatures of both upstream and downstream surfaces of the rotor. Measurements of concentration and swirl over a range of purge have been obtained in wheel-spaces upstream and downstream of the rotor in a turbine rig. In transient heating tests, fast-response thermocouples were used to measure the temperature of the air in the wheel-space core; simultaneously, the temperatures of the upstream and downstream rotor surfaces were determined from infra-red sensors. The extrapolated steady-state temperatures (obtained using a maximum-likelihood estimation analysis) were used to determine the adiabatic effectiveness as a function of purge flow rate. The buffer effect of the purge flow for both wheel-spaces was quantified via comparisons between the variation of Ψ with purge flow rate. It was shown that the sealing effectiveness for the downstream wheel-space was larger than for the upstream. Consequently, and consistent with the theoretical model, the buffering effect of the purge flow was shown to be smaller downstream

    AB - Ingress is the penetration of a hot mainstream gas in a turbine annulus through the rim seal into the wheel-space between the rotating turbine disc (the rotor) and the adjacent stationary casing (the stator). Purge flow is used to prevent or reduce ingress, and the sealing effectiveness relates the flow rates of the purge and ingress. In this paper, an adiabatic effectiveness is used to relate the temperatures of a thermally-insulated rotor, the purge flow and the ingress. A non-dimensional buffer parameter, Ψ, is used to relate the sealing effectiveness on the stator and the adiabatic effectiveness on the rotor, respectively. This paper reports the first experimental study of the effect of ingress and purge flow on the adiabatic temperatures of both upstream and downstream surfaces of the rotor. Measurements of concentration and swirl over a range of purge have been obtained in wheel-spaces upstream and downstream of the rotor in a turbine rig. In transient heating tests, fast-response thermocouples were used to measure the temperature of the air in the wheel-space core; simultaneously, the temperatures of the upstream and downstream rotor surfaces were determined from infra-red sensors. The extrapolated steady-state temperatures (obtained using a maximum-likelihood estimation analysis) were used to determine the adiabatic effectiveness as a function of purge flow rate. The buffer effect of the purge flow for both wheel-spaces was quantified via comparisons between the variation of Ψ with purge flow rate. It was shown that the sealing effectiveness for the downstream wheel-space was larger than for the upstream. Consequently, and consistent with the theoretical model, the buffering effect of the purge flow was shown to be smaller downstream

    KW - Turbine Disc

    KW - Ingress

    KW - Heat Transfer

    KW - Buffer Effect

    KW - Rim-Seals

    KW - Sealing effectiveness

    KW - Adiabatic Effectiveness

    KW - Adiabatic Rotor Temperature

    UR - https://www.mdpi.com/2226-4310/6/5/49

    U2 - 10.3390/aerospace6050049

    DO - 10.3390/aerospace6050049

    M3 - Article

    VL - 6

    JO - Journal of Aerospace Computing, Information, and Communication

    JF - Journal of Aerospace Computing, Information, and Communication

    SN - 1542-9423

    IS - 5

    M1 - 49

    ER -