Numerical modeling of the labyrinth seal taking into account vibrations of the gas transmittal unit rotor in aeroelastic formulation

Abstract

The article deals with the issues related to the mutual influence of vibrations and gas dynamic processes in the labyrinth seals (LS) of gas transmittal unit compressors. The mutual influence of vibrational gas dynamic processes in LS and vibrations of the rotor is studied. Within the framework of the unified algorithm, a solution is obtained for an unsteady aeroelastic one-dimensional gas flow problem in a deformable LS. A new factor (the rotor diameter in the LS region), which affects the pulsation magnitude of the gas dynamic force in the LS, is revealed. Changing the diameter of the rotor, you can reduce vibration. In this case, it is possible to reduce the designated clearances in the LS and to reduce the leakage.

Effects of Four Types of Pre-swirls on the Leakage, Flow Field, and Fluid-Induced Force of the Rotary Straight-through Labyrinth Gas Seal

“…The high-resolution scheme was applied as the advection scheme and for turbulence numerics. Based on the past CFD analyses and computational convergence [20][21][22][23][24][25], the flow regime (subsonic), opening pressure (relative pressure), flow direction (normal to the boundary condition), and turbulence quantities (turbulence intensity = 5%) were defined for the seal inlet and outlet boundaries. The inlet pre-swirl velocity was considered negligible.…”

“…To understand the flow characteristics of the labyrinth seal more fully, and to improve the design performance in labyrinth seals, three methods are mostly used in the available publications: experimental [14][15][16], mathematical computation [17][18][19], and numerical simulation [20][21][22][23][24][25]. Computational fluid dynamics (CFD) is an established industrial design tool that helps to reduce design time scales and improve processes throughout the engineering world.…”