Numerical Predictions and Measurements of Discharge Coefficients in Labyrinth Seals

Abstract

The present paper illustrates the possibilities and limitations in applying advanced numerical codes for the description of the flow through labyrinth seals to evaluate the discharge coefficient. Comparison with data derived from detailed measurements in a newly developed test facility are reported. Pressure ratios and geometrical parameters are varied in wide ranges, reflecting engine conditions. The two-dimensional, elliptic finite difference code is applied to the compressible, turbulent flow in straight and stepped seals utilizing the standard k-ε-model. Good agreement of the predictions with the measurements is achieved for pressure ratios up to 2.5.

Comparative analysis of the influence of labyrinth seal configuration on leakage behavior

“…Testing seal performance under real engine conditions is one of the recent research trends [7]. Computational fluid dynamics (CFD) is also increasingly used in analyzing flows inside labyrinth seals [8][9][10][11][12]. While numerical analysis sometimes does not give very accurate predictions of overall aerodynamic performance, it at least shows local flow fields and relative performance comparisons between different configurations.…”

Numerical Investigation on the Effects of Structural Parameters of Labyrinth Cavity on Sealing Performance

“…It is a dimensionless quantity and is often used to describe the sealing efficiency [7,[16][17][18][19][26][27][28][29]:…”

“…In the late twentieth century, a series of experimental and numerical studies were carried out to investigate the labyrinth mechanism in rotating machinery [7][8][9]. Later, many researchers began continuously enriching the labyrinth used in rotating machinery, and by the beginning of the 21st century, valuable research results on the labyrinth seal in rotating machinery began being published [10][11][12][13][14].…”

Analiza rozkładu prędkości w komorze uszczelnienia labiryntowego na podstawie badań eksperymentalnych i obliczeń numerycznych

“…Zawarto w niej analizę rozkładów prędkości osiowych i ciśnienia statycznego w segmencie uszczelnienia jednostronnego, składającego się z sześciu tarcz i jednostronnego stopniowanego. Analizę pól prędkości i ciśnień w modelowym segmencie uszczelnienia dwustronnego z tarczami prostopadłymi do powierzchni wału i pochylonymi opisano w pracy [8]. W pracy [6] przeprowadzono szczegółową analizę wpływu geometrii ostrzy dławnicy niezupełnej na parametry przepływu z uwzględnie-niem współczynnika przenoszenia energii kinetycznej.…”