Shape Optimization of a Labyrinth Seal Applying the Simulated Annealing Method

Schramm, V.; Denecke, J.; Kim, S.; Wittig, S.

doi:10.1080/10236210490474485

Cited by 12 publications

(17 citation statements)

References 11 publications

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“…Regarding CFD simulations of labyrinth seals, Wittig [12], Rhode [13], and Schramm [14] did extensive works in this area. They used CFD tools to perform optimization for different kinds of labyrinth seals, including staggered, stepped, and see-through.…”

Section: Figure 4 Notations Of See-through Labyrinth Sealmentioning

confidence: 99%

Numerical modeling of supercritical carbon dioxide flow in see-through labyrinth seals

Yuan

Pidaparti

Wolf

et al. 2015

Nuclear Engineering and Design

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This paper presents a numerical study of Supercritical Carbon Dioxide (sCO 2) flow in see-through labyrinth seals. The Computational Fluid Dynamic (CFD) simulation of this scenario is performed under the framework of OpenFOAM. Properties of sCO 2 are implemented into OpenFOAM with a user-defined interface. A test facility was constructed to measure the leakage rate and pressure drop of sCO 2 in see-through labyrinth seals. Various designs and conditions have been tested to study the flow characteristic and provide validation data for numerical model. The primary goal is to verify the model's capability to predict leakage rate, with a secondary goal focused on using the code to optimize the seal design for sCO 2. This research concludes with some guidelines for the see-through labyrinth seal optimization.

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Section: Figure 4 Notations Of See-through Labyrinth Sealmentioning

confidence: 99%

Numerical modeling of supercritical carbon dioxide flow in see-through labyrinth seals

Yuan

Pidaparti

Wolf

et al. 2015

Nuclear Engineering and Design

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“…The flow in the labyrinth seals and their influence on the rotor dynamic characteristics are studied in many works [4][5][6][7][8][9][10][11]. However, most works consider action of average hydrogasodynamic forces in the sealing clearance to the rotor and leakages throw the seal.…”

Section: Theoretical Researchmentioning

confidence: 99%

Influence of Geometry on Vortex Configuration and Dimension in LRE Turbopump Labyrinth Seal

Иванов

Moskvicev

2015

Procedia Engineering

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Rotor seals are the most important element of turbomachine. Seals characteristics determine efficiency, reliability and lifetime of turbopump. Labyrinth seals have lower flow coefficient compared to gap seals. However they are used not so often because under certain conditions they may cause of rotor dynamic instability. Vortex in seal grooves are one of the causes of rotor oscillations. And their number, configuration, dimensions and velocity directly depend on groove geometry. The paper describes the modeling of the flow in labyrinth seal using ANSYS CFX, the influence of groove geometry on vortex number, dimension and configuration.

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“…This paper proved a significant impact of the leakage on mixing losses and secondary flows that generate considerable energy loss in the stage of the turbine. In Schramm et al (2004), a numerical method of optimization of the shape of the stepped labyrinth seal was presented. Stępień and Kossowski (2009) as well as Stępień et al (2003) include the analysis of the flow in a straight-through over-shroud seal in a turbine stage.…”

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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Shape Optimization of a Labyrinth Seal Applying the Simulated Annealing Method

Cited by 12 publications

References 11 publications

Numerical modeling of supercritical carbon dioxide flow in see-through labyrinth seals

Numerical modeling of supercritical carbon dioxide flow in see-through labyrinth seals

Influence of Geometry on Vortex Configuration and Dimension in LRE Turbopump Labyrinth Seal

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

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