考虑表面粗糙度的液膜密封空化及承载能力分析

发布时间：2018-01-21 23:04

  本文关键词： 液膜密封 空化 承载能力 表面粗糙度　出处：《润滑与密封》2017年06期 　论文类型：期刊论文

【摘要】：为进一步探索表面粗糙度对液膜密封影响,基于质量守恒的JFO空化模型,建立粗糙表面直线槽液膜密封物理模型,采用有限体积法离散控制方程并用Gauss-Seidel松弛迭代法求解,分析表面粗糙度、膜厚及操作工况特征数对液膜密封空穴发生及承载能力的影响。结果表明:以空化面积比为判据,液膜中空穴区域随膜厚增大而增大但承载能力呈减小趋势,且两者均随工况特征数的增大而增大;在膜厚较小如低于5~6μm时,较大表面粗糙度有助于促生空穴和提升承载能力,而在膜厚较大时,其影响减弱甚至被忽略;在较高工况特征数时,较大表面粗糙度对承载能力的提升影响明显,而在较低工况特征数时,较大表面粗糙度对空穴区域的增大影响明显。
[Abstract]:In order to further explore the effect of surface roughness on liquid film seal, based on the JFO cavitation model of mass conservation, the physical model of linear groove liquid film seal with rough surface was established. The finite volume method is used to discretize the governing equation and the Gauss-Seidel relaxation iteration method is used to analyze the surface roughness. The effect of film thickness and operating condition characteristic number on the cavitation generation and bearing capacity of liquid film seal is studied. The results show that the cavitation area increases with the increase of film thickness, but the bearing capacity decreases with the increase of film thickness. And both of them increase with the increase of working condition characteristic number. When the film thickness is smaller than 5 渭 m, the larger surface roughness is helpful to promote cavity growth and enhance the bearing capacity, but when the film thickness is larger, the influence is weakened or even neglected. At higher operating conditions, the larger surface roughness has an obvious effect on the increase of the loading capacity, while at the lower operating condition, the larger surface roughness has an obvious effect on the increase of the hole region.
【作者单位】： 中国石油大学(华东)密封技术研究所;
【基金】：国家自然科学基金项目(51375497) 山东省自主创新及成果转化专项(2014ZZCX10102-4)
【分类号】：TH136
【正文快照】： )j縥縥縥縥縥縥縥，

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