【摘要】 给出了控制径向推力联合浮环动静压轴承内、外层油膜的气油两相流变密度、变粘度无量纲非定常Reynolds方程及压力边界条件和深腔流量平衡方程,对不同偏心率下含气率为0和0.1的径向、推力部分内外油膜进行了有限元计算,得到压力分布及各静态特性曲线。结果表明,小偏心率时深腔气穴对轴承性能影响较为明显,使径向油膜压力峰值下降20%以上,轴向油膜压力峰值下降10%以上,并使浮环轴承径向、轴向部分的承载力、摩擦功耗减小,流量增大。随着偏心率的增大及转速的提高,气穴的影响程度减小。更多还原

【Abstract】 The static performance of externally pressurized hybrid journal-thrust floating ring bearing was studied considering the cavitations in deep pockets.The cylinder coordinates dimensionless Reynolds equations governing the inner and outer film of this hybrid floating-ring bearing were deduced,the physical model about the two-phase flow of bubbly oil was introduced.The Reynolds equations of the variable density and viscosity with inertia term together with the pressure boundary condition and the flow equation were solved by using the Finite Element Method.The three dimension pressure distribution and the static characteristics coefficients of this bearing were obtained under different eccentricity and rotational speed.Under small eccentricity,the pressure peak value of radial section with cavitations decreases above 20%,the pressure peak value of thrust section decreases above 10%.Load carrying capacity and friction power loss of the bearing decrease due to cavitations,flow volume rate increases with cavitations.With the increase of eccentricity or rotational speed,the influence of cavitations weakens.更多还原