Study on the Structures of Fluid Flows in an Irregular Annular Space like a Partial Arc Journal Bearings

结果表明：(1)基于垫块间隙的临界泰勒数与浸没式多垫块滑动轴承的临界泰勒数具有几乎相同的趋势。(2)随着腔弧范围θ_s的增大，基于垫块间隙的Taylor涡首先出现。随着θ_s的进一步增大，基于腔隙的泰勒涡与基于垫隙的泰勒涡共存。(3)即使腔弧范围θ_s极大地增加以使轴瓦最小化，基于轴瓦间隙的泰勒涡也不会消失。随着泰勒数的增加，它们穿透空腔区域的深度越来越深，并根据空腔间隙对泰勒涡进行扫掠。(4)当以120度的间隔设置三个最小的垫块时，基于垫块间隙的泰勒涡将它们完全扫走，就好像空腔不存在一样。即使在这种情况下，也会自然产生空腔流来满足质量含量的作用。泰勒涡与空腔流之间的相互作用有待于在未来的工作中进行精确的观察。

The results are summarized as follows :(1) The critical Taylor number based on the pad clearance has almost the same tendency which has been obtained in submerged multi-pad journal bearings.(2) As the cavity arc extent θ_s increases, the Taylor vortices based on the pad clearance appear first. As θ_s increases further, the Taylor vortices based on the cavity clearance appear and coexist with those based on the pad clearance.(3) Even if the cavity arc extent θ_s increases extremely large to minimize the bearing pad, the Taylor vortices based on the pad clearance never vanish. As the Taylor number increases, they penetrate the cavity region deeper and deeper to sweep the Taylor vortices based on the cavity clearance.(4) When three minimized pads are set at intervals of 120 deg., the Taylor vortices based on the pad clearance sweep them away completely, as if the cavities do not exist.Even in such a case, the cavity flow is naturally generated to satisfy the mass content role. Interaction between the Taylor vortices and cavity flows remains to be observed precisely in the future work.