Effect of a rib on rim seal performance

Moon, Mi-Ae; Lee, Chung-Suk; Kim, Kwang‐Yong

doi:10.1016/j.icheatmasstransfer.2014.10.011

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…In 2012, Popovic and Howard et al [14] studied the characteristics of the same sealing structure by altering the parameters of its geometry. Subsequently, Mi-Ae Moon [15] added a fin based on this Ivan geometry, and the results showed that the fin could significantly block the ingress fluid. In 2016, based on the sealing characteristics of the sealing structure, Liu et al [16] designed a cylindrical bulge on the inner side of the sealing structure to create the circumferential pressure non-uniformity of the inner cavity, and they comprehensively evaluated its performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Research on Flow Characteristics at High Radii of Rim Seals with Different Geometric Structures

Xue,

Li,

Ren

2024

Energies

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In the high-temperature mainstream of gas turbines, there is a rim clearance between the rotor and the stator. A rim seal is to prevent the intrusion of high-temperature gas by spraying cool fluid from the inside of the rim clearance to the outside. In the past research on rim seals, the focus was on the overall performance of the sealing structure, and the flow in the disc cavity was studied more, but the high-radius flow was simplified. In recent years, additional research in the field has focused on more complex sealing structures and high-radius flows, such as the interface between the disk cavity and the mainstream. There is more work to be conducted in this area of research. In this paper, the unsteady numerical simulation of the flow in four different rim sealing geometries is carried out by the URANS method. The flow phenomena and the influence of geometry on the flow are studied. The numerical simulation results are validated with the experimental results. It is found that the fluid in the rim sealing obviously presents two distinct forms and confrontations according to the tangential velocity. The flow in the sealing structure presents obvious circumferential non-uniformity. Compared with the single-axial structure, in the single-radial structure, the mixing area is induced by the radial geometry, and more vortex structures are generated, the mixing process is more intense, and the sealing effect is better. In the double-sealing structure, the inner structure plays the role of a barrier, and the cavity geometry between the two layers has a major influence on the sealing performance.

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Section: Introductionmentioning

confidence: 99%

Numerical Research on Flow Characteristics at High Radii of Rim Seals with Different Geometric Structures

Xue,

Li,

Ren

2024

Energies

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“…Liao et al [28] investigated the flow and heat transfer characteristics in a rotor-stator disk cavity using the Reynolds-averaged Navier- [29] numerically investigate the influence of purge flow on the endwall flow and heat transfer characteristics of a gas turbine blade. Moon et al [30] investigated the effect of a rib installed in a rim seal on sealing effectiveness using three-dimensional Reynolds-averaged Navier-Stokes equations and the Spalart-Allmaras turbulence closure model. A parametric study with different heights, widths, and location of the ribs was performed.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of hot gas ingestion into the rotor-stator disk cavities of a subscale 1.5-stage axial gas turbine

Ghasemian

Princevac

Kim³

et al. 2019

International Journal of Heat and Mass Transfer

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Both steady and unsteady Reynolds Averaged Navier-Stokes (RANS) techniques coupled with the k À e and k À x ðSSTÞ turbulence models are utilized to study the flow characteristics and hot gas ingestion through rim seal in a subscale 1.5-stage axial gas turbine. A scalar transport equation is solved for a tracer gas to represent the coolant flow interaction with the main stream flow. To validate the numerical methodology, radial pressure and sealing effectiveness distributions are compared with the experimental data. The k À x ðSSTÞ turbulence model has the capability to predict secondary flow characteristics, reattachment and separation, thus leading to better agreement with the experimental data. Both radial and circumferential pressure distributions are analyzed to get deeper insight into rotationally and externally induced ingress mechanisms. The circumferential pressure peak-to-trough amplitude is significantly attenuated in the cavity region compared to annulus region. Finally, different purge flow rates and rotational speeds are examined. Results indicate that as purge flow rate increases, the static pressure in the disk cavity region raises remarkably and consequently the sealing effectiveness improves. Averaged sealing effectiveness in the rim cavity decreases linearly with the rotational speed. To visualize different mechanisms of ingestion, streamline and flow field are shown.

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“…Additional studies were conducted to characterise the tendency of the flow around the rim seal according to the flow conditions (such as coolant flow rate, rotational Reynolds number, and rotational speed of the disk) [17] and the shape parameter of the rim seal [8,18]. Recently, a study was reported on the performance of a rim seal with an inner cavity and a rib structure added to the rotor side [19], and with two buffer cavities that attenuate the circumferential pressure asymmetries of the flow introduced from the mainstream gas In the maximisation of cooling and sealing effects with a minimum coolant flow rate, there have been various concerns regarding the shape of the rim seal. Many studies are related to the deformation of the two-dimensional shape on the meridional section of the rim seal.…”

Section: Introductionmentioning

confidence: 99%

Harmonisation of Coolant Flow Pattern with Wake of Stator Vane to Improve Sealing Effectiveness Using a Wave-Shaped Rim Seal

2019

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The rim seal of the gas turbine is intended to protect the material of the turbine disk from hot combustion gases. The study of the rim seal structure is important to minimise the coolant flow and maximise the sealing effect. In this paper, a wave-shaped rim seal for stator disks is proposed and its effect is confirmed by numerical analysis. To characterise the flow phenomena near the wave-shaped rim seal, a simplified model of the wave-shaped rim seal (Type 1 model), which excludes the rotor blade and stator vane, is analysed and compared with the conventional rim seal. Then, through analysis of the wave-shaped rim seal geometry (Type 2 model), which includes the rotor blade and stator vane, a reduction in egress and ingress flow was observed owing to the wave-shaped rim seal, and the sealing effectiveness on the stator disk of turbine was increased by up to 3.8%. Implementation of the wave-shape geometry in the radial seal is a novel choice for turbine designers to consider in future for better-performing and more-efficient turbines.

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Effect of a rib on rim seal performance

Cited by 6 publications

References 13 publications

Numerical Research on Flow Characteristics at High Radii of Rim Seals with Different Geometric Structures

Numerical Research on Flow Characteristics at High Radii of Rim Seals with Different Geometric Structures

Numerical modeling of hot gas ingestion into the rotor-stator disk cavities of a subscale 1.5-stage axial gas turbine

Harmonisation of Coolant Flow Pattern with Wake of Stator Vane to Improve Sealing Effectiveness Using a Wave-Shaped Rim Seal

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