Theoretical Modeling of the Vapor Cavitation in Dynamically Loaded Journal Bearings
Theoretical Modeling of the Vapor Cavitation in Dynamically Loaded Journal Bearings
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DOI：
10.1115/1.3261288
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发表时间：
1986-10
影响因子：
2.5
通讯作者：
D. Brewe
中科院分区：
文献类型：
--
作者：
D. Brewe
本文从理论上研究了在动载条件下浸没滑动轴承中汽泡的演化规律。雷诺方程的解是用控制体积法（Elrod算法）数值确定的。该方法在整个计算域中保持质量，包括液体-蒸气界面，其可以或可以不相对于最小膜线运动。采用交替方向隐式（ADI）方法进行时间推进。与Jakobsson和Floberg关于稳态空化的实验结果吻合得很好。非平稳空化气泡寿命的预测比较合理，以及测量Jacobson和Hamrock使用高速摄影。进行了比较研究，以确定一些应用非保守理论的动态问题的后果。选择了轴颈在圆周轨迹上旋转的完整动态循环作为比较的基础。在接近周期结束时，在负载组件中观察到显著差异。在每种情况下，观察到空化的发生，随后是气泡的生长和随后的崩溃。更完整的细节，这种现象的说明与使用的透视图描绘相关的压力分布和区域的气蚀与位置和运动的轴颈在外壳内。
A theoretical investigation is made of the evolution of a vapor bubble for a submerged journal bearing under dynamically loaded conditions. The solution to the Reynolds equation is determined numerically using a control volume method (Elrod algorithm). This method conserves mass throughout the computational domain including the liquid-vapor interface which may or may not be in motion relative to the minimum film line. An ADI (Alternating Direction Implicit) method is used to effect the time march. Excellent agreement was found with the experimental work of Jakobsson and Floberg for stationary cavitation. Predictions of bubble life for nonstationary cavitation compare reasonably well with that measured by Jacobson and Hamrock using high-speed photography. A comparison study was performed to determine some of the consequences of applying a nonconservative theory to a dynamic problem. A complete dynamic cycle of a journal whirling in a circular path was chosen for the basis of comparison. Significant differences were observed in the load components near the end of the cycle. In each case, onset of cavitation was observed followed by bubble growth and subsequent collapse. More complete details of this phenomena are illustrated with the use of perspective graphic plots depicting the associated pressure distribution and region of cavitation with position and motion of the journal within the housing.