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Leakage flow analysis in the gas turbine shroud gap

Filip Wasilczuk (Fluid Flow Machinery Institute, Polish Academy of Sciences, Gdansk, Poland)
Pawel Flaszynski (Fluid Flow Machinery Institute, Polish Academy of Sciences, Gdansk, Poland)
Piotr Kaczynski (Fluid Flow Machinery Institute, Polish Academy of Sciences, Gdansk, Poland)
Ryszard Szwaba (Fluid Flow Machinery Institute, Polish Academy of Sciences, Gdansk, Poland)
Piotr Doerffer (Fluid Flow Machinery Institute, Polish Academy of Sciences, Gdansk, Poland)
Krzysztof Marugi (Avio Polska, Bielsko Biała, Poland)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 16 November 2018

Issue publication date: 21 August 2019

Abstract

Purpose

The purpose of the study is to measure the mass flow in the flow through the labyrinth seal of the gas turbine and compare it to the results of numerical simulation. Moreover the capability of two turbulence models to reflect the phenomenon will be assessed. The studied case will later be used as a reference case for the new, original design of flow control method to limit the leakage flow through the labyrinth seal.

Design/methodology/approach

Experimental measurements were conducted, measuring the mass flow and the pressure in the model of the labyrinth seal. It was compared to the results of numerical simulation performed in ANSYS/Fluent commercial code for the same geometry.

Findings

The precise machining of parts was identified as crucial for obtaining correct results in the experiment. The model characteristics were documented, allowing for its future use as the reference case for testing the new labyrinth seal geometry. Experimentally validated numerical model of the flow in the labyrinth seal was developed.

Research limitations/implications

The research studies the basic case, future research on the case with a new labyrinth seal geometry is planned. Research is conducted on simplified case without rotation and the impact of the turbine main channel.

Practical implications

Importance of machining accuracy up to 0.01 mm was found to be important for measuring leakage in small gaps and decision making on the optimal configuration selection.

Originality/value

The research is an important step in the development of original modification of the labyrinth seal, resulting in leakage reduction, by serving as a reference case.

Keywords

Citation

Wasilczuk, F., Flaszynski, P., Kaczynski, P., Szwaba, R., Doerffer, P. and Marugi, K. (2019), "Leakage flow analysis in the gas turbine shroud gap", Aircraft Engineering and Aerospace Technology, Vol. 91 No. 8, pp. 1077-1085. https://doi.org/10.1108/AEAT-01-2018-0038

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited