A model of gas flow with friction in a slotted seal

Joachimiak, Damian; Krzyślak, Piotr

doi:10.1515/aoter-2016-0022

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…Moreover, it was proved that if too many teeth were applied the leakage in the seal increased. For a small tooth pitch, the nature of the gas flow in a straight-through seal is similar to that in a slotted seal [21]. Paper [22] presents the method for optimization of the stepped labyrinth seal with two teeth.…”

Section: Fig 3 Vectors Of Velocity Fields In a Chosen Segmentmentioning

confidence: 99%

Method for the reduction of leakage in labyrinth seals by adapting the seal geometry to match the flow conditions

Joachimiak

2021

E3S Web Conf.

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In this paper a method for reducing leakage in labyrinth seals is presented. This method is based on CFD calculations and consists in the analysis of the phenomenon of gas kinetic energy carry-over in chambers of the seal between gaps. It belongs to the group of geometrical inverse problems and is designed for seals of given outside dimensions. For straight through labyrinth seals it enables determining the number of teeth and their optimal arrangement. This method was developed based on numerical and experimental tests. Examples of numerical calculations presented in this paper prove that this method is effective for straight through seals. We obtained the reduction of leakage ranging from 8.7 to 9.4% relative to the initial geometry with no change in the outside dimensions of the seal.

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Section: Fig 3 Vectors Of Velocity Fields In a Chosen Segmentmentioning

confidence: 99%

Method for the reduction of leakage in labyrinth seals by adapting the seal geometry to match the flow conditions

Joachimiak

2021

E3S Web Conf.

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“…The gas flow in the furnace is forced by a fan. The gas flows through the annular channel [15] and then makes reversal at the furnace door. It flows in the furnace chamber as in a reversing chamber [16] (Fig.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heating time and of temperature distributions for cylindrical geometry with the use of solution to the inverse problem

Joachimiak

2021

E3S Web Conf.

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Changes in heating time of a cylinder in the furnace for thermal and thermochemical treatments depending on the given heating rate is analysed in this paper. Temperature distributions from the axis to the boundary of the cylinder were determined based on solving non-stationary and non-linear inverse problem for the heat equation. Differences between the temperature on the boundary and along the cylinder axis for processes with the given heating rates from 5 to 10ᵒC/min were calculated. Twofold increase in the heating rate allowed the heating time to be reduced significantly. Increase in the heating rate had no impact on the difference between the temperature on the boundary and on the axis of the cylinder and on the quantity of energy being consumed by heating elements.

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“…Presented model accurately reflects the value of leakage for a specific type of sealing. Model describing the gas flow in the cavity seal based on the enthalpy balance equation is presented in the paper by Joachimiak and Krzyślak (2016). In this model, the gas kinetic energy dissipation into heat, being the result of the friction between the gas and the wall, was taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Universal Method for Determination of Leakage in Labyrinth Seal

Joachimmiak

2020

JAFM

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This paper presents calculation model enabling determination of the leakage rate in labyrinth seals. Described model is based on the Saint-Venant equation. It includes a new type of flow coefficient, which was determined based on experimental tests and described depending on the Reynolds number and the radial clearance. The structure of this calculation model can be applied to determine the leakage rate in straight through, staggered labyrinth seals as well as with various number of clearances. This model enables determining distribution of thermodynamic and flow parameters of the gas along the seal length. Results obtained from this model were next compared with experimental data for various types of seals. It enabled determination of kinetic energy carry-over coefficient in geometries under investigation. The value of this coefficient was then compared with the value of the coefficient from the Scharrer's, Neumann's and Hodkinson's models. Obtained results indicate that the value of the kinetic energy carry-over coefficient depends not only on the seal geometry, but also on the pressure decrease.

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A model of gas flow with friction in a slotted seal

Cited by 10 publications

References 14 publications

Method for the reduction of leakage in labyrinth seals by adapting the seal geometry to match the flow conditions

Method for the reduction of leakage in labyrinth seals by adapting the seal geometry to match the flow conditions

Analysis of heating time and of temperature distributions for cylindrical geometry with the use of solution to the inverse problem

Universal Method for Determination of Leakage in Labyrinth Seal

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