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research-article

On the thermodynamic process in the bulk-flow model for the estimation of the dynamic coefficients of labyrinth seals

[+] Author and Article Information
Filippo Cangioli

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
filippo.cangioli@polimi.it

Paolo Pennacchi

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
paolo.pennacchi@polimi.it

Giuseppe Vannini

General Electric Oil&Gas, Via Felice Matteucci 2, 50127, Florence, Italy
giuseppe.vannini@ge.com

Lorenzo Ciuchicchi

General Electric Oil&Gas, 480 Allée Gustave Eiffel, Le Creusot, France
lorenzo.ciuchicchi@ge.com

Andrea Vania

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
andrea.vania@polimi.it

Steven Chatterton

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
steven.chatterton@polimi.it

Phuoc Vinh Dang

The University of Danang - Danang University of Science and Technology, Nguyen Luong Bang Road, 54. Da Nang City, Vietnam
dpvinh@dut.udn.vn

1Corresponding author.

ASME doi:10.1115/1.4037919 History: Received July 04, 2017; Revised July 26, 2017

Abstract

The influence of sealing components on the stability of turbomachinery has become a key topic because oil and gas market is increasingly requiring high rotational speed and high efficiency, which implies the clearance reduction in the seals. The experimental results of a 14 teeth-on-stator labyrinth seal with nitrogen, performed in the high-pressure seal test rig owned by GE Oil&Gas, are presented in the paper. Both experimental tests with positive and negative pre-swirl values were performed in order to investigate the pre-swirl effect on the cross-coupled stiffness coefficients. In this paper, the authors improve the state-of-the-art one-control volume bulk-flow model [1], by introducing the effect of the energy equation in the zero-order solution. In this way, the real gas properties are evaluated in a more accurate way because the enthalpy variation, expected through the seal cavities, is taken into account in the model. The authors, considering the energy equation only in the zero-order solution, assume that the enthalpy is not a function of the clearance perturbation (i.e. of the rotor perturbed motion). Overall, by taking into account the energy equation, a better estimation of the coefficients in the case of negative pre-swirl ratio has been obtained (as it results from the comparison with the experimental benchmark tests). The numerical results are also compared to the state-of-the-art bulk-flow model developed by Thorat and Childs (2010), highlighting the improvement obtained.

Copyright (c) 2017 by ASME
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