An advanced single-stage turbine facility for investigating non-axisymmetric contoured endwalls in the presence of purge flow

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

Abstract

In modern gas turbines, endwall contouring (EWC) is employed to modify the static pressure field downstream of the vanes and minimise the growth of secondary flow structures developed in the blade passage. Purge flow (or egress) from the upstream rim-seal interferes with the mainstream flow, adding to the loss generated in the rotor. Despite this, EWC is typically designed without consideration of mainstream-egress interactions. The performance gains offered by EWC can be reduced, or in the limit eliminated, when purge air is considered. In addition, EWC can result in a reduction in sealing effectiveness across the rim seal. Consequently, industry is pursuing a combined design approach that encompasses the rim-seal, seal-clearance profile and EWC on the rotor endwall.
This paper presents the design of, and preliminary results from a new single-stage axial turbine facility developed to investigate the fundamental fluid dynamics of egress-mainstream flow interactions. To the authors’ knowledge this is the only test facility in the world capable of investigating the interaction effects between cavity flows, rim seals and EWC. The design of optical measurement capabilities for future studies, employing volumetric velocimetry and planar laser induced fluorescence are also presented. The fluid-dynamically scaled rig operates at benign pressures and temperatures suited to these techniques and is modular. The facility enables expedient interchange of EWC (integrated into the rotor bling), blade-fillet and rim-seals geometries.
The measurements presented in this paper include: gas concentration effectiveness and swirl measurements on the stator wall and in the wheel-space core; pressure distributions around the nozzle guide vanes at three different spanwise locations; pitchwise static pressure distributions downstream of the nozzle guide vane at four axial locations on the stator platform.
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2019: Turbine Technical Conference and Exposition
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages17
Publication statusAccepted/In press - 17 Jun 2019
EventASME Turbo Expo 2019 - Arizona, Phoenix, USA United States
Duration: 17 Jun 201921 Jun 2019
https://event.asme.org/Events/media/library/resources/turbo/Turbo-Expo-2019-Program.pdf

Conference

ConferenceASME Turbo Expo 2019
CountryUSA United States
CityPhoenix
Period17/06/1921/06/19
Internet address

Cite this

Jones, R., Pountney, O., Cleton, B., Wood, L., Schreiner, B., Carvalho Batista Soares De Figueiredo, A. J., ... Sangan, C. (Accepted/In press). An advanced single-stage turbine facility for investigating non-axisymmetric contoured endwalls in the presence of purge flow. In Proceedings of the ASME Turbo Expo 2019: Turbine Technical Conference and Exposition [GT2019-90377] American Society of Mechanical Engineers (ASME).

An advanced single-stage turbine facility for investigating non-axisymmetric contoured endwalls in the presence of purge flow. / Jones, Robin; Pountney, Oliver; Cleton, Bjorn; Wood, Liam; Schreiner, Buchan; Carvalho Batista Soares De Figueiredo, Artur Joao; Scobie, James; Cleaver, David; Lock, Gary; Sangan, Carl.

Proceedings of the ASME Turbo Expo 2019: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers (ASME), 2019. GT2019-90377.

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

Jones, R, Pountney, O, Cleton, B, Wood, L, Schreiner, B, Carvalho Batista Soares De Figueiredo, AJ, Scobie, J, Cleaver, D, Lock, G & Sangan, C 2019, An advanced single-stage turbine facility for investigating non-axisymmetric contoured endwalls in the presence of purge flow. in Proceedings of the ASME Turbo Expo 2019: Turbine Technical Conference and Exposition., GT2019-90377, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2019, Phoenix, USA United States, 17/06/19.
Jones R, Pountney O, Cleton B, Wood L, Schreiner B, Carvalho Batista Soares De Figueiredo AJ et al. An advanced single-stage turbine facility for investigating non-axisymmetric contoured endwalls in the presence of purge flow. In Proceedings of the ASME Turbo Expo 2019: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers (ASME). 2019. GT2019-90377
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abstract = "In modern gas turbines, endwall contouring (EWC) is employed to modify the static pressure field downstream of the vanes and minimise the growth of secondary flow structures developed in the blade passage. Purge flow (or egress) from the upstream rim-seal interferes with the mainstream flow, adding to the loss generated in the rotor. Despite this, EWC is typically designed without consideration of mainstream-egress interactions. The performance gains offered by EWC can be reduced, or in the limit eliminated, when purge air is considered. In addition, EWC can result in a reduction in sealing effectiveness across the rim seal. Consequently, industry is pursuing a combined design approach that encompasses the rim-seal, seal-clearance profile and EWC on the rotor endwall.This paper presents the design of, and preliminary results from a new single-stage axial turbine facility developed to investigate the fundamental fluid dynamics of egress-mainstream flow interactions. To the authors’ knowledge this is the only test facility in the world capable of investigating the interaction effects between cavity flows, rim seals and EWC. The design of optical measurement capabilities for future studies, employing volumetric velocimetry and planar laser induced fluorescence are also presented. The fluid-dynamically scaled rig operates at benign pressures and temperatures suited to these techniques and is modular. The facility enables expedient interchange of EWC (integrated into the rotor bling), blade-fillet and rim-seals geometries. The measurements presented in this paper include: gas concentration effectiveness and swirl measurements on the stator wall and in the wheel-space core; pressure distributions around the nozzle guide vanes at three different spanwise locations; pitchwise static pressure distributions downstream of the nozzle guide vane at four axial locations on the stator platform.",
author = "Robin Jones and Oliver Pountney and Bjorn Cleton and Liam Wood and Buchan Schreiner and {Carvalho Batista Soares De Figueiredo}, {Artur Joao} and James Scobie and David Cleaver and Gary Lock and Carl Sangan",
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AU - Cleton, Bjorn

AU - Wood, Liam

AU - Schreiner, Buchan

AU - Carvalho Batista Soares De Figueiredo, Artur Joao

AU - Scobie, James

AU - Cleaver, David

AU - Lock, Gary

AU - Sangan, Carl

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N2 - In modern gas turbines, endwall contouring (EWC) is employed to modify the static pressure field downstream of the vanes and minimise the growth of secondary flow structures developed in the blade passage. Purge flow (or egress) from the upstream rim-seal interferes with the mainstream flow, adding to the loss generated in the rotor. Despite this, EWC is typically designed without consideration of mainstream-egress interactions. The performance gains offered by EWC can be reduced, or in the limit eliminated, when purge air is considered. In addition, EWC can result in a reduction in sealing effectiveness across the rim seal. Consequently, industry is pursuing a combined design approach that encompasses the rim-seal, seal-clearance profile and EWC on the rotor endwall.This paper presents the design of, and preliminary results from a new single-stage axial turbine facility developed to investigate the fundamental fluid dynamics of egress-mainstream flow interactions. To the authors’ knowledge this is the only test facility in the world capable of investigating the interaction effects between cavity flows, rim seals and EWC. The design of optical measurement capabilities for future studies, employing volumetric velocimetry and planar laser induced fluorescence are also presented. The fluid-dynamically scaled rig operates at benign pressures and temperatures suited to these techniques and is modular. The facility enables expedient interchange of EWC (integrated into the rotor bling), blade-fillet and rim-seals geometries. The measurements presented in this paper include: gas concentration effectiveness and swirl measurements on the stator wall and in the wheel-space core; pressure distributions around the nozzle guide vanes at three different spanwise locations; pitchwise static pressure distributions downstream of the nozzle guide vane at four axial locations on the stator platform.

AB - In modern gas turbines, endwall contouring (EWC) is employed to modify the static pressure field downstream of the vanes and minimise the growth of secondary flow structures developed in the blade passage. Purge flow (or egress) from the upstream rim-seal interferes with the mainstream flow, adding to the loss generated in the rotor. Despite this, EWC is typically designed without consideration of mainstream-egress interactions. The performance gains offered by EWC can be reduced, or in the limit eliminated, when purge air is considered. In addition, EWC can result in a reduction in sealing effectiveness across the rim seal. Consequently, industry is pursuing a combined design approach that encompasses the rim-seal, seal-clearance profile and EWC on the rotor endwall.This paper presents the design of, and preliminary results from a new single-stage axial turbine facility developed to investigate the fundamental fluid dynamics of egress-mainstream flow interactions. To the authors’ knowledge this is the only test facility in the world capable of investigating the interaction effects between cavity flows, rim seals and EWC. The design of optical measurement capabilities for future studies, employing volumetric velocimetry and planar laser induced fluorescence are also presented. The fluid-dynamically scaled rig operates at benign pressures and temperatures suited to these techniques and is modular. The facility enables expedient interchange of EWC (integrated into the rotor bling), blade-fillet and rim-seals geometries. The measurements presented in this paper include: gas concentration effectiveness and swirl measurements on the stator wall and in the wheel-space core; pressure distributions around the nozzle guide vanes at three different spanwise locations; pitchwise static pressure distributions downstream of the nozzle guide vane at four axial locations on the stator platform.

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