Influence of Honeycomb Rubbing on the Labyrinth Seal Performance

Frączek, Daniel; Wróblewski, Włodzimierz; Bochon, Krzysztof

doi:10.1115/1.4034183

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…Later on, Szymanski et al [10] also compared two different experiments with the CFD outcomes, showing good agreements. Another very detailed numerical study about OAS with honeycomb is due to Fraczek et al [11]. They have provided radial profiles both at the seal inlet and outlet including the honeycomb rubbing.…”

Section: Previous Workmentioning

confidence: 99%

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Dimensionless Numbers Relationships for Outer Air Seal of Low Pressure Turbine

Pałkus

Strzelczyk

2021

IJTPP

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The dimensional analysis and the numerical parametric study of the typical outer air seal from a low-pressure turbine were performed in the framework of the presented paper. The most crucial variables for the flow through the outer air seal were identified and further dimensionless numbers were derived. The dependent quantities resulting from the analysis were: the axial Reynolds number (formulated with the bulk velocity, corresponding to the mass flow through the seal), the outlet swirl ratio (incorporating the exit flow angle, important for mixing) and the windage heating (related to the internal losses). Additionally, the discharge coefficient was cross-checked enabling further comparison with the available literature. The comprehensive numerical parametric study included all important contributors for the flow through the seal with a parameter operating range appropriate for engine outer air seals.

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Section: Previous Workmentioning

confidence: 99%

“…Most of them were steady state. The SST was applied as a turbulence model as advised in [10,11,15]. The limiting convergence value was set to 1 × 10 −4 (rms value), but frequently it dropped below 1 × 10 −5 .…”

Section: Solvermentioning

confidence: 99%

Dimensionless Numbers Relationships for Outer Air Seal of Low Pressure Turbine

Pałkus

Strzelczyk

2021

IJTPP

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“…The analysis was performed for two different slot heights, chamber sizes and pressure ratios. Numerical research of the gas flow in the honeycomb seal has also been presented by Frączek et al (2017). The paper presents the influence of the change in geometry parameters such as position and height of the teeth on the reduction of the leakage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Gas Flow in a Labyrinth Seal of Variable Pitch

Joachimmiak

Krzyślak

2019

JAFM

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The paper discusses the results of investigations performed for the segments of straight-through labyrinth seals of constant length. Increasing the number of teeth of a segment resulted in a reduction of the pitch length to obtain the slot seals. The phenomena occurring during gas flow in labyrinth and slot seals differ significantly. They are described with different calculation models. The analysis presented in this paper is related to the change of the tightness and the nature of the flow from a straight-through labyrinth seal to a slot seal. The paper includes the results of experimental research and CFD calculations. Models applied for the Neumann and Scharer labyrinth seals as well as the model of the Salzman and Fravi slot seals were discussed. For the Neumann and Scharer models, correction coefficients for the tested geometry were proposed. Based on the assumptions for the said models and the obtained results, the phenomena responsible for the minimization of the leakage were discussed. The leakage rate in segments of different gap heights depending on the number of teeth and the pressure ratio upstream and downstream of the segment has been analyzed. Based on the experimental data, an optimum number of teeth in the segment for minimum leakage was determined. CFD calculations allowed determining the minimum leakage geometry. The experimental data contained in this paper confirm that the determined optimum pitch range is independent of the pressure drop.

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“…Phenomena like shock waves, overexpansion or overcompression are responsible for nozzle efficiency drop and, therefore, worse turbine performance. Higher pressure ratios also require appropriate sealing system (Wróblewski et al, 2018;Frączek et al, 2017) in order to prevent leakage. Losses in the outlet system are also significantly decreasing the overall turbine efficiency and are influenced by rotational speed (Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Comparison of methods for the determination of Tesla turbine performance

Rusin¹,

Wróblewski²,

Strozik³

2019

Journal of Theoretical and Applied Mechanics

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A numerical and experimental investigation of the Tesla turbine is presented in the paper. The experiment is conducted for various inlet pressure and load. The roughness of the rotor disc is determined as it is a key factor to obtain high turbine efficiency and power. The numerical investigations are performed for the same conditions as in the experiment. The computational results are compared with the analytical model. Comparison of performance characteristics show a relatively good agreement between the experiment and CFD. The analytical model overestimates distributions of pressure and circumferential velocities, although the predicted power is on the similar level as in the experiment and CFD.

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Influence of Honeycomb Rubbing on the Labyrinth Seal Performance

Cited by 12 publications

References 11 publications

Dimensionless Numbers Relationships for Outer Air Seal of Low Pressure Turbine

Dimensionless Numbers Relationships for Outer Air Seal of Low Pressure Turbine

Analysis of the Gas Flow in a Labyrinth Seal of Variable Pitch

Comparison of methods for the determination of Tesla turbine performance

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