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research-article

Optimization of the Straight-Through Labyrinth Seal with a Smooth Land

[+] Author and Article Information
Artur Szymański

Silesian University of Technology Gliwice, Poland
aarturszymanski@gmail.com

Włodzimierz Wróblewski

Silesian University of Technology Gliwice, Poland
wlodzimierz.wroblewski@polsl.pl

Daniel Frączek

Silesian University of Technology Gliwice, Poland
daniel.fraczek@polsl.pl

Krzysztof Bochon

Silesian University of Technology Gliwice, Poland
krzysztof.bochon@polsl.pl

Sławomir Dykas

Silesian University of Technology Gliwice, Poland
slawomir.dykas@polsl.pl

Krzysztof Marugi

Silesian University of Technology Gliwice, Poland
Krzysztof.marugi@polsl.pl

1Corresponding author.

ASME doi:10.1115/1.4040767 History: Received June 25, 2018; Revised June 29, 2018

Abstract

This paper presents the methodology and results of the optimisation of a straight-through labyrinth seal with two inclined fins against smooth-land. The optimisation was performed using commercial tools implemented in the ANSYS environment, such as Goal-Driven Optimization. The response surfaces were created based on Latin hypercube samples found from CFD calculations. The CFD solver, using a steady-state scheme with the k - omega Shear Stress Transport turbulence model, was applied. A screening algorithm was used to find the best candidates on the response surfaces. The objective function adopted in the labyrinth seal optimisation was the minimisation of the discharge coefficient value. A wide range of parameters of the fins position and shape were taken into account, with physically justified degrees of freedom. The optimisation results were supported by the results of an in-house experiment performed on a stationary, linear test rig. The test rig was fed by a high-capacity vacuum air blower, with high-precision hot-wire anemometry mass flow evaluation. The reductions in the leakage significantly exceed the uncertainties of the CFD model and the test rig accuracy. The factors that had the most substantial impact on the leakage reduction were the location, inclination and thickness of the fins. The experimental results were compared with the calculations and the optimisation effects, highlighting some tendencies in the labyrinth seal flow behaviour. Good agreement was obtained between the optimisation results and the experimental data, proving that the presented methodology is sufficient for the labyrinth seal optimisation.

Copyright (c) 2018 by ASME
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