Abstract
Variation of film pressure was studied by short bearing hypothesis and differential method for grooving on film inner-face. The results were compared with those of FLUENT analysis. Then, effects of the position of groove were studied on film pressure and damping through differential method. The results shown that short bearing hypothesis cannot conform to the actual situation considering grooving. The effect of grooving on the pressure distribution of film was researched by differential method, and the results are consistent with the FLUENT simulation analysis. Side grooving has less effect on film pressure and damping, so it is recommended when the design and assembly conditions are allowed.
Highlights
Most of the faults of aero-engines are vibration faults
The paper is based on the structural parameters of a certain type of squeeze film damper and the effects of supply groove on characteristics of Squeeze film damper (SFD) were researched through short bearing hypothesis, differential method and FLUENT simulation
It can be seen that only the influence of grooving on the film pressure distribution is real when using differential method, and its result is very close to the Fluent simulation result
Summary
Most of the faults of aero-engines are vibration faults. The possibility of faults in rotor support system will be increasing when the rotor is operating under high speed. The faults include large vibration, non-synchronized whirling and instability of the rotor system, even the fatigue fracture of the rotor shaft They will seriously affect the performance and life of the aero-engines [1]. Squeeze film damper (SFD) is widely used in the rotor support of aero-engines due to its relatively simple structural design and obvious damping effect. Zhanchi Liu et al [5, 6] designed a flexible rotor system that can change the film clearance separately and studied the effect of static eccentricity on the damping characteristics of the squeeze film damper. The paper is based on the structural parameters of a certain type of squeeze film damper and the effects of supply groove on characteristics of SFD were researched through short bearing hypothesis, differential method and FLUENT simulation.
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