Experimental Assessment of Correlative Approaches for the Prediction of Leakage Flow through Labyrinth Seals

Simple analytical models can be employed to estimate the leakage mass flow rate from labyrinth seals, resulting in a quick procedure, well suited for the early design process. Different formulas were proposed by many authors during the past decades and most of them employ a carry-over factor and a f...

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Bibliographic Details
Published in:Applied sciences 2023-06, Vol.13 (12), p.6863
Main Authors: Castelli, Niccolò, Bacci, Tommaso, Picchi, Alessio, Winchler, Lorenzo, Facchini, Bruno
Format: Article
Language:English
Subjects:
Accuracy
Advertising campaigns
Analysis
analytical methods
Clearances
correlation
Energy
experimental
Flow coefficients
Flow rates
Fluid flow
Labyrinth seals
Leakage
Mass flow rate
Pressure distribution
Pressure ratio
Reynolds number
secondary flows
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Summary:Simple analytical models can be employed to estimate the leakage mass flow rate from labyrinth seals, resulting in a quick procedure, well suited for the early design process. Different formulas were proposed by many authors during the past decades and most of them employ a carry-over factor and a flow coefficient to predict the mass flow rate across the clearance area. The present work aims to compare the analytical prediction with the results of an experimental campaign. The experimental results were retrieved from a dedicated test rig for both a straight-through and a stepped labyrinth seal. Hence, for each seal, the effect of the clearance size, the Reynolds number and the pressure ratio has been investigated. Starting from the experimental required inputs, six different correlations are considered, with both direct and indirect methods. The results are shown as a function of pressure ratio and clearance gap. Despite some differences in the comparison, and most of the used correlation underestimate the measured mass flow rate, some general trends and guidelines can be highlighted.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13126863