基于瞬态流场计算的滑动轴承静平衡位置求解

将计算流体动力学与动网格法应用于滑动轴承静平衡位置的求解,通过采用全新的变流域动网格技术,在瞬态流场计算的基础上提出一种静平衡位置求解方法。在求解过程中考虑油膜发散区内气穴的存在,并与其他油膜边界条件进行比较。通过流场分析计算不同静载荷、轴承结构、油膜间隙和轴颈旋转速度下的静平衡位置。数值计算表明:滑动轴承的静平衡位置与轴颈初始位置无关;随着静载荷的变化,静平衡位置点呈半圆分布;静平衡位置的坐标和迭代轨迹可以用来分析不同速度下不同轴承结构的稳定性;对于多油楔轴承,顶隙对静平衡位置的影响要大于侧隙。

Solution of static equilibrium position of journal bearing based on transient flow calculation

The computational fluid dynamics (CFD) and dynamic mesh method were applied to the numerical calculation of static equilibrium position of journal bearing. By employing a new mesh movement approach based on structured grid, a new approach to calculate the static equilibrium position of journal bearing was proposed based on the transient flow calculation. The effect of cavitations in the divergence area was considered in the method, and the computational results were compared with the results under other boundary conditions during the solving process. The static equilibrium positions were calculated under different static load, bearing structure, oil film clearance and rotational speed. The calculation results indicate that the static equilibrium position is independent of the initial position of journal. There will be a semicircular distribution of static equilibrium position when the static load changes. The stability of journal bearing under different velocities can be characterized by the position of journal center and journal whirling orbit. For multi-wedge journal bearing, the effect of the tip clearance on the results is larger than that of the side clearance.