Flow instability effects related to purge through a gas turbine chute seal

Arijit Roy; Jens Fridh; James Scobie; Carl Sangan; Gary Lock

doi:10.33737/jgpps/140172

Flow instability effects related to purge through a gas turbine chute seal

Arijit Roy, Jens Fridh, James Scobie, Carl Sangan, Gary Lock

KTH Royal Institute of Technology

Research output: Contribution to journal › Article › peer-review

3 Citations (SciVal)

115 Downloads (Pure)

Abstract

This paper investigates flow instabilities inside the cavity formed between the stator and rotor disks of a high-speed turbine rig. The cavity rim seal is of chute seal design. The influence of flow coefficient on the sealing effectiveness at constant purge flow rate through the wheel-space is determined. The effectiveness at different radial positions over a range of purge flow conditions and flow coefficients is also studied. Unsteady pressure measurements have identified the frequency of instabilities that form within the rim seal, phenomena which have been observed in other studies. Frequencies of these disturbances, and their correlation in the circumferential direction have determined the strength and speed of rotation of the instabilities within the cavity. Large scale unsteady rotational structures have been identified, which show similarity to previous studies. These disturbances have been found to be weakly dependent on the purge flow and flow coefficients, although an increased purge reduced both the intensity and speed of rotation of the instabilities. Additionally, certain uncorrelated disturbances have been found to be inconsistent (discontinuous) with pitchwise variation.

Original language	English
Pages (from-to)	111-125
Number of pages	15
Journal	Journal of the Global Power and Propulsion Society
Volume	5
DOIs	https://doi.org/10.33737/jgpps/140172
Publication status	Published - 24 Aug 2021

Bibliographical note

Funding Information:
The authors would like to thank Kunyuan Zhou, Gregor Schmidt, Navid Mikaillian for their invaluable inputs and support during the research. Special thanks also to the HPT laboratory engineers G?ran Arntyr and Leif Pettersson for their invaluable support with electrical to mechanical issues related to the experiments.The research received funding as part of a collaboration between KTH Royal Institute of Technology and SIEMENS Turbomachinery AB, Finsp?ng.

Publisher Copyright:
© 2021 Roy et al.

Keywords

Axial turbine
Chute seal
Flow coefficient
Ingress
Purge flow
Rotational instabilities

ASJC Scopus subject areas

Aerospace Engineering
Industrial and Manufacturing Engineering
Mechanical Engineering

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10.33737/jgpps/140172Licence: CC BY

Flow instability effects related to purge through a gas turbine chute seal (Journal)Final published version, 1.03 MBLicence: CC BY

Cite this

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title = "Flow instability effects related to purge through a gas turbine chute seal",

abstract = "This paper investigates flow instabilities inside the cavity formed between the stator and rotor disks of a high-speed turbine rig. The cavity rim seal is of chute seal design. The influence of flow coefficient on the sealing effectiveness at constant purge flow rate through the wheel-space is determined. The effectiveness at different radial positions over a range of purge flow conditions and flow coefficients is also studied. Unsteady pressure measurements have identified the frequency of instabilities that form within the rim seal, phenomena which have been observed in other studies. Frequencies of these disturbances, and their correlation in the circumferential direction have determined the strength and speed of rotation of the instabilities within the cavity. Large scale unsteady rotational structures have been identified, which show similarity to previous studies. These disturbances have been found to be weakly dependent on the purge flow and flow coefficients, although an increased purge reduced both the intensity and speed of rotation of the instabilities. Additionally, certain uncorrelated disturbances have been found to be inconsistent (discontinuous) with pitchwise variation.",

keywords = "Axial turbine, Chute seal, Flow coefficient, Ingress, Purge flow, Rotational instabilities",

author = "Arijit Roy and Jens Fridh and James Scobie and Carl Sangan and Gary Lock",

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AU - Roy, Arijit

AU - Fridh, Jens

AU - Scobie, James

AU - Sangan, Carl

AU - Lock, Gary

N1 - Funding Information: The authors would like to thank Kunyuan Zhou, Gregor Schmidt, Navid Mikaillian for their invaluable inputs and support during the research. Special thanks also to the HPT laboratory engineers G?ran Arntyr and Leif Pettersson for their invaluable support with electrical to mechanical issues related to the experiments.The research received funding as part of a collaboration between KTH Royal Institute of Technology and SIEMENS Turbomachinery AB, Finsp?ng. Publisher Copyright: © 2021 Roy et al.

PY - 2021/8/24

Y1 - 2021/8/24

N2 - This paper investigates flow instabilities inside the cavity formed between the stator and rotor disks of a high-speed turbine rig. The cavity rim seal is of chute seal design. The influence of flow coefficient on the sealing effectiveness at constant purge flow rate through the wheel-space is determined. The effectiveness at different radial positions over a range of purge flow conditions and flow coefficients is also studied. Unsteady pressure measurements have identified the frequency of instabilities that form within the rim seal, phenomena which have been observed in other studies. Frequencies of these disturbances, and their correlation in the circumferential direction have determined the strength and speed of rotation of the instabilities within the cavity. Large scale unsteady rotational structures have been identified, which show similarity to previous studies. These disturbances have been found to be weakly dependent on the purge flow and flow coefficients, although an increased purge reduced both the intensity and speed of rotation of the instabilities. Additionally, certain uncorrelated disturbances have been found to be inconsistent (discontinuous) with pitchwise variation.

AB - This paper investigates flow instabilities inside the cavity formed between the stator and rotor disks of a high-speed turbine rig. The cavity rim seal is of chute seal design. The influence of flow coefficient on the sealing effectiveness at constant purge flow rate through the wheel-space is determined. The effectiveness at different radial positions over a range of purge flow conditions and flow coefficients is also studied. Unsteady pressure measurements have identified the frequency of instabilities that form within the rim seal, phenomena which have been observed in other studies. Frequencies of these disturbances, and their correlation in the circumferential direction have determined the strength and speed of rotation of the instabilities within the cavity. Large scale unsteady rotational structures have been identified, which show similarity to previous studies. These disturbances have been found to be weakly dependent on the purge flow and flow coefficients, although an increased purge reduced both the intensity and speed of rotation of the instabilities. Additionally, certain uncorrelated disturbances have been found to be inconsistent (discontinuous) with pitchwise variation.

KW - Axial turbine

KW - Chute seal

KW - Flow coefficient

KW - Ingress

KW - Purge flow

KW - Rotational instabilities

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DO - 10.33737/jgpps/140172

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VL - 5

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EP - 125

JO - Journal of the Global Power and Propulsion Society

JF - Journal of the Global Power and Propulsion Society

ER -

Flow instability effects related to purge through a gas turbine chute seal

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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