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考虑表面粗糙度的液膜密封空化及承载能力分析
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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)


Analysis of Cavitation and Loadcarrying Capacity of Liquid Film Seals with Consideration of Surface Roughness
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    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5~6 μm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 explore the effects of surface roughness on the liquid film seals,based on the massconservative JFO cavitation model,the physical model of radial groove liquid film seals with surface roughness was established,and the average flow Reynolds equation with consideration of surface roughness was discretized by finite control volume method and solved by GaussSeidel relaxation iteration method.Effects of surface roughness,film thickness and operation characteristic number on the cavitation occurrence and loadcarrying capacity were analyzed.Results indicate that,by the cavitation area rate as the criterion,cavitation zone becomes larger but loadcarrying capacity becomes smaller as the increase of film thickness,and both of them become larger when the characteristic number is increased.Larger surface roughness can help to improve the cavitation zone and loadcarrying capacity as film thickness is relatively smaller as below 5~6 microns,but the effect of surface roughness is wakened and even is ignored.As well,larger surface roughness contributes to improving the loadcarrying capacity for the case of higher characteristic number and also increasing the cavitation zone under the condition of smaller characteristic number.

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李振涛,郝木明,曹恒超,杨文静,王赟磊,孙鑫晖.考虑表面粗糙度的液膜密封空化及承载能力分析[J].润滑与密封,2017,42(6):1-6.
. Analysis of Cavitation and Loadcarrying Capacity of Liquid Film Seals with Consideration of Surface Roughness[J]. Lubrication Engineering,2017,42(6):1-6.

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  • 在线发布日期: 2018-02-27
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