【摘 要】
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This paper proposes a new type of negative dislocated seal(NDS)based on the dislocated bearing model and investigates the influential of static rotor eccentricity and dislocation ratio on the static a
【机 构】
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Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System,Shenyang Aerospace Univ
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This paper proposes a new type of negative dislocated seal(NDS)based on the dislocated bearing model and investigates the influential of static rotor eccentricity and dislocation ratio on the static and rotordynamic characteristics of an example seal solving with computational fluid dynamics(CFD)the flow field.The rotordynamic characteristics of the NDS are investigated for the effect of rotor whirling frequency on response force,stiffness coefficients,damping coefficients and rotor system stability by multi-frequency elliptical orbit rotor whirling model.Based on the studies,the following conclusions are obtained.The circumferential pressure distribution of NDS and conventional labyrinth seal(LS)presents sine periodic variation approximately,while relative to the LS,the NDS has two divergent wedge gaps and reduces the hydrodynamic pressure effects,then the circumferential pressure difference and tangential force(about 40%~190%smaller)on rotor surface decreases.The leakage of the NDS linearly increases with the rising eccentricity ratio and dislocation ratio approximately,and is larger(about 0.9%~1.5%)than the LS.Compared with the LS,the NDS has smaller(about 28.8%~206.2%)cross-coupled stiffness coefficients,larger(about 26.0%~348.6%)effective damping coefficients,and good stability of rotor system.The efforts of this study develop a novel seal structure which is promising to improve the seal performance of turbomachinery such as aeroengines.
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