Performance of a Turbine Rim Seal Subject to Rotationally-Driven and Pressure-Driven Ingestion

Revert, Anna Bru; Beard, Paul F.; Chew, John W.; Bottenheim, Sebastiaan

doi:10.1115/1.0002993v

“…Revert et al [4] reported the sealing performance of a chute seal under RI conditions using a rotor disc without blades, and axisymmetric and non-axisymmetric annulus flow. A range of flow coefficients were achieved by keeping the mainstream flow constant and varying the rotational speed of the disc.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of Flow Coefficient on Ingress Through Turbine Rim Seals

Graikos

¹

,

Carnevale

²

,

Sangan

³

et al. 2021

Journal of Engineering for Gas Turbines and Power

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Rim seals are critical in terms of limiting the temperature of highly-stressed engine components but function with a penalty to the power output and contribute to entropy gain stemming from mixing losses in the turbine. Ingress through rim seals is influenced by the presence of rotor blades and stator vanes, and the mainstream flow coefficient in the annulus that determines the corresponding swirl. This paper presents an experimental study of ingress upstream and downstream of the rotor disc in a 1.5-stage rig with double radial clearance rim seals. Two rotor discs were used, one with blades and one without, and two platforms were used downstream of the rotor, one with vanes and one without. Tests were conducted at two rotational speeds and a range of flow conditions was achieved by varying the annulus and sealing mass flow rates. Concentration effectiveness, swirl and steady pressure measurements separated, for the first time, the influence of the blades and vanes on ingress over a wide range of flow conditions. Measurements on the downstream stator platform provide added insight into the complex interaction between the egress and the mainstream. Measurements of unsteady pressure revealed the presence of large-scale structures, even in the absence of blades. The number and speed of the structures was shown to depend on the flow coefficient and the purge flow rate.

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“…The experiment with a chute rim seal, as described by Beard et al [6] and Bru Revert et al [23], is considered here. Results for configurations with and without nozzle guide vanes, but without rotating blades, are presented.…”

Section: Turbine Rim Sealingmentioning

confidence: 99%

“…Values were obtained at discrete points on the stator as shown in the figures. The experimental values presented were obtained from concentration measurements as described by Bru Revert et al [23]. Figure 17 shows the results for the configuration without vanes.…”

Section: Sealing Effectivenessmentioning

confidence: 99%

Wall-Modelled Large Eddy Simulations of Axial Turbine Rim Sealing

Palermo¹,

Gao²,

Amirante³

et al. 2021

Preprint

Self Cite

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This paper presents WMLES simulations of a chute type turbine rim seal. Configurations with an axisymmetric annulus flow and with nozzle guide vanes fitted (but without rotor blades) are considered. The passive scalar concentration solution and WMLES are validated against available data in the literature for uniform convection and a rotor-stator cavity flow. The WMLES approach is shown to be effective, giving significant improvements over an eddy viscosity turbulence model, in prediction of rim seal effectiveness compared to research rig measurements. WMLES requires considerably less computational time than wall-resolved LES, and has the potential for extension to engine conditions. All WMLES solutions show rotating inertial waves in the chute seal. Good agreement between WMLES and measurements for sealing effectiveness in the configuration without vanes is found. For cases with vanes fitted the WMLES simulation shows less ingestion than the measurements, and possible reasons are discussed.

show abstract

Influence of Flow Coefficient on Ingress Through Turbine Rim Seals

Graikos

¹

,

Carnevale

²

,

Sangan

³

et al. 2021

Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling

0

View full text Add to dashboard Cite

Rim seals are critical in terms of limiting the temperature of highly-stressed engine components but function with a penalty to the power output and contribute to entropy gain stemming from mixing losses in the turbine. Ingress through rim seals is influenced by the presence of rotor blades and stator vanes, and the mainstream flow coefficient in the annulus that determines the corresponding swirl. This paper presents an experimental study of ingress upstream and downstream of the rotor disc in a 1.5-stage rig with double radial clearance rim seals. Two rotor discs were used, one with blades and one without, and two platforms were used downstream of the rotor, one with vanes and one without. Tests were conducted at two rotational speeds and a range of flow conditions was achieved by varying the annulus and sealing mass flow rates. Concentration effectiveness, swirl and steady pressure measurements separated, for the first time, the influence of the blades and vanes on ingress over a wide range of flow conditions. Measurements on the downstream stator platform provide added insight into the complex interaction between the egress and the mainstream. Measurements of unsteady pressure revealed the presence of large-scale structures, even in the absence of blades. The number and speed of the structures was shown to depend on the flow coefficient and the purge flow rate.

show abstract

Performance of a Turbine Rim Seal Subject to Rotationally-Driven and Pressure-Driven Ingestion

Cited by 3 publications

References 6 publications

Influence of Flow Coefficient on Ingress Through Turbine Rim Seals

Influence of Flow Coefficient on Ingress Through Turbine Rim Seals

Wall-Modelled Large Eddy Simulations of Axial Turbine Rim Sealing

Influence of Flow Coefficient on Ingress Through Turbine Rim Seals

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