Three-Dimensional Flow and Pressure Patterns in a Hydrostatic Journal Bearing Pocket
Three-Dimensional Flow and Pressure Patterns in a Hydrostatic Journal Bearing Pocket
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DOI：
10.1115/1.2833875
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发表时间：
1997-10
影响因子：
2.5
通讯作者：
M. Braun;M. Dzodzo
中科院分区：
文献类型：
--
作者：
M. Braun;M. Dzodzo
流体静压袋中的层流由一个数学模型描述，该模型使用以主要变量u， v， w和p表示的三维Navier-Stokes方程。使用保守公式，通过配位体拟合网格应用有限体积多块方法。在深长比为0.02的浅孔中模拟流动。作者在他们之前的二维模型中获得和描述的流动结构在库埃特流和射流主导流的三维方面都是可见的。已经发现，两种流动形式都形成了具有三维螺旋状结构的中心和次级涡胞，这些涡胞引导流体沿袋的轴向向外伸展。在Couette主导流中，中心涡胞中心的位置在毛细节流器进气管道出口区域，而在射流主导流中，中心涡胞在袋体下游形成一个扁平的中心涡胞。还确定了流体回转区占据了袋底与流道之间的所有上游空间，从而阻止了任何流体通过袋的上游出口。文中还给出了两种流型的轴下压力分布。结果表明，在Couette和射流占主导的两种情况下，袋内的压力在周向上变化明显，而在轴向上变化不明显。
The laminar flow in a hydrostatic pocket is described by a mathematical model that uses the three-dimensional Navier-Stokes equations written in terms of the primary variables, u, v, w, and p. Using a conservative formulation, a finite volume multiblock method is applied through a collocated, body fitted grid. The flow is simulated in a shallow pocket with a depth/length ratio of 0.02. The flow structures obtained and described by the authors in their previous two dimensional models are made visible in their three dimensional aspect for both the Couette, and the jet dominated flows. It has been found that both flow regimes formed central and secondary vortical cells with three dimensional corkscrew-like structures that lead the fluid on an outward bound path in the axial direction of the pocket. In the Couette dominated flow the position of the central vortical cell center is at the exit region of the capillary restrictor feedline, while in the jet dominated flow a flattened central vortical cell is formed in the downstream part of the pocket. It has also been determined that a fluid turn around zone occupies all the upstream space between the floor of the pocket and the runner, thus preventing any flow exit through the upstream exit of the pocket. The corresponding pressure distribution under the shaft for both flow regimes is presented as well. It was clearly established that both for the Couette, and the jet dominated cases the pressure varies significantly in the pocket in the circumferential direction, while its variation is less pronounced axially.