海水淡化高压泵水润滑轴承液膜压力分布

针对海水淡化高压多级泵水润滑轴承的可靠性论证研究和探究其液膜动力传递机理,并分析液膜压力分布及其影响因素,文中采用有限差分法数值求解二维定常雷诺方程将方程离散化处理,并且采用超松弛迭代法求解离散的线性方程组以达到加速收敛的目的,通过Matlab编程求得海水淡化泵水润滑轴承沿周向的水膜压力先增后减并呈现出非线性,而沿轴向则呈抛物线分布,并通过对轴承宽径比和偏心率参数方案的选择对比,研究其影响水润滑轴承的压力分布,结果显示水膜压力随轴承宽径比和偏心率的增大而增大.验证结果表明前期设计的水润滑轴承,能够保证水润滑轴承所起的安全润滑和支撑作用.

Pressure distribution in liquid film in water lubricated bearings of high-pressure pump for desalination

In order to assess the reliability of liquid film in the water lubricated bearings of a multi-stage high-pressure pump for desalination and to explore the mechanism for bearing a load as well as the factors affecting the mechanism, the pressure distribution in the liquid film was analyzed by solving the two-dimensional steady Reynolds equation with finite difference method and successive over relaxation(SOR)scheme for the discretized linear equations in Matlab. It was shown that the pressure in the liquid film was distributed nonlinearly along the circumferential direction and had a maximum peak at a certain position, but the pressure distribution was parabolic along the axial direction. The pressure profile was affected by length-diameter ratio and eccentricity, particularly, the pressure increased with them. These results are useful for design and selection of the water lubricated bearings of a high-pressure pump for desalination in million-ton processing capacity. It was conformed that the designed bearings have an acceptable reliability and a satisfactory lubrication condition and a sufficient sustainability for loads.