Universal Method for Determination of Leakage in Labyrinth Seal

Joachimmiak, D.

doi:10.29252/jafm.13.03.30618

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Geometries of straight through labyrinth seals used so far usually have the pitchchamber height ratio approximately equal to unity (LP/H≈1). From the paper [15] it arises that leakage in straight through seals is significantly lower when the geometry of the seal is characterized by the parameter (LP-B)/H approximately equal to 0.5. The value of the parameter (LP-B)/H is verified for the initial geometry.…”

Section: Choice Of the Initial Geometry Of The Straight Through Seal For The Methods Of Optimizationmentioning

confidence: 99%

“…This phenomenon is particularly intensive in straight through seals where the expanding gas stream flows through the whole chamber length with a high velocity. The degree of seal wear has considerable impact on the leak-tightness of the seal [14][15][16]. Leakage of the seal depends on such features of the seal geometry as pitch, length, and height of the chamber [17][18][19][20].…”

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

confidence: 99%

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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: Choice Of the Initial Geometry Of The Straight Through Seal For The Methods Of Optimizationmentioning

confidence: 99%

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 Saint-Venant equation was modified and used to calculate the leakage rate through the labyrinth seals. The model included a new form of flow coefficient that was calculated using experimental data and defined in terms of Reynolds number and radial clearance (Joachimiak 2020) (Joachimiak and Krzyśłak 2019).…”

Section: Interlobe Clearance Leakages In Twin-screw Compressormentioning

confidence: 99%

Prediction of Interlobe Leakages in Screw Compressors

2021

JAFM

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The clearance gaps in twin-screw compressors are critical for their performance and reliable operation, as the leakage flows through these clearances influence the volumetric and adiabatic efficiencies. The amount of leakage flows depends on the clearance size and shape as well as various geometric and operating parameters. Usually, the isentropic nozzle equations along with appropriate flow coefficients are used for more accurate estimation of the leakage flow rates through the clearance gaps. Hence, a proper understanding of the flow coefficients and their relationship with the dimensionless parameters (such as pressure ratio, Reynolds number, and aspect ratios) is critical for an accurate prediction of the leakage flows. In the present study, considering the interlobe clearance gap in screw compressor in terms of rectangular openings, the interlobe leakage flow rates are estimated for various opening sizes and pressure conditions using isentropic nozzle equations and an iterative method. The flow coefficients are determined by comparing the experimental values obtained using a specialized test rig and the flow rates obtained from the analytical methods. The dimensionless parameters are varied to see their individual effect on the leakage mass flow rates and on the flow coefficients. The mean deviation from the experimental results when using an analytical iterative procedure (-8.5%) is substantially lower in comparison to the mean deviation (+26.8%) using the isentropic nozzle equations. The study validates that the iterative method can be preferred (for an interlobe leakage flow rate prediction) over the isentropic nozzle equation method.

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“…Analyses presented in this paper were inspired by research on the flow coefficient, which has been partly described in [4]. During this research, we observed the step character of the flow coefficient change.…”

Section: Introductionmentioning

confidence: 96%

Experimental and Numerical Analysis of the Gas Flow in the Axisymmetric Radial Clearance

Joachimiak

Frąckowiak

2020

Energies

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This paper focuses on the analysis of the gas flow in the axisymmetric mini gap bounded by the surface of the top of the labyrinth seal tooth and the surface of the body. It includes the results of experimental research and numerical calculations. Experimental research focused on the analysis of gas flow for six clearance heights in a wide range of pressure drops. Based on this research, we determined the mass flow in the clearance. Using the Saint-Venant equation, we determined the flow coefficient versus the pressure ratio upstream and downstream from the seal. Flow coefficients for various clearance heights obtained from the experiment can be divided into two data groups, the values of which differ significantly. To explain changes in the value of the gas flow coefficient for selected clearance heights, numerical analysis of the said gas flow was performed using the Fluent software. This analysis allowed us to explain the reason for the variability of the flow coefficient. This research can be the basis for determining the change of seal integrity during operation for staggered and stepped seals.

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Universal Method for Determination of Leakage in Labyrinth Seal

Cited by 8 publications

References 19 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

Prediction of Interlobe Leakages in Screw Compressors

Experimental and Numerical Analysis of the Gas Flow in the Axisymmetric Radial Clearance

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