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Thermohydrodynamic Modeling of Squeeze Film Dampers in High-Speed Turbomachinery
Journal Article
04-11-02-0006
ISSN: 1946-3952, e-ISSN: 1946-3960
Sector:
Topic:
Citation:
Hamzehlouia, S. and Behdinan, K., "Thermohydrodynamic Modeling of Squeeze Film Dampers in High-Speed Turbomachinery," SAE Int. J. Fuels Lubr. 11(2):129-145, 2018, https://doi.org/10.4271/04-11-02-0006.
Language:
English
Abstract:
This work develops a comprehensive thermohydrodynamic (THD) model for high-speed
squeeze film dampers (SFDs) in the presence of lubricant inertia effects.
Firstly, the generalized expression for Reynolds equation is developed.
Additionally, in order to reduce the complexity of the hydrodynamic equations,
an average radial viscosity is defined and integrated into the equations.
Subsequently, an inertial correction to the pressure is incorporated by using a
first-order perturbation technique to represent the effect of lubricant inertia
on the hydrodynamic pressure distribution. Furthermore, a thermal model,
including the energy equation, the Laplace heat conduction equations in the
surrounding solids (i.e. the journal and the bush), and the thermal boundary
conditions at the interfaces is constructed. Moreover, the system of partial
differential hydrodynamic and thermal equations is simultaneously solved by
using an iterative numerical algorithm. The proposed model is incorporated into
a simulation model and the results are represented at different SFD journal
speeds and eccentricity ratios. According to the results of the analysis, the
fluid film reaction forces are significantly influenced by both the lubricant
thermal effects and inertia.