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Analysis of the impact of mass flow extraction on the change of parameters in a labytinth seal using the Stodola method

Kaszowski P., Dzida M.

Journal of Polish CIMEEAC

2016

Vol. 11, no 1

55--67

Labyrinth seals are an important element of a steam turbine set design. The use of diagnostic extraction makes it possible to control the operation of a seal by providing information on the thermodynamic parameters along the length of the seal. Diagnostic extraction has a considerable impact on the change of the parameters, the amount of the extracted mass. This article describes the dependence of pressure in the clearance downstream of the extraction and in the chamber in which the extraction point is located, on the amount of the extracted steam. Relation between pressure and nominal seal clearance is discussed, which enables the control of the seal operation. The calculations of the seal operation parameters were performed using a method proposed by Stodola.

Comparative analysis of the results of gas flow in a labyrinth seal for a numerical and theoretical model

Kaszowski P., Dzida M.

Journal of Polish CIMAC

2014

Vol. 9, no 2

117--125

Labyrinth seals are an important component of gas and steam turbines design. Many calculation models are available in order to determine the thermodynamic parameters of gas along the seal length: starting with models based on an analytical solution to the problem of gas flow through a seal to numerical models resulting in numerical data and visualizations of conditions inside the seal. In this article the results of calculations made using the Fanno model and the Saint-Venant's Principle with the k-epsilon model in Ansys Fluent are compared.