• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>2006 Fall Technical Conference of the ASME(American Society of Mechanical Engineers) Internal Combustion Engine Division >EFFECTS OF LINER SURFACE TEXTURING ON RING/LINER FRICTION IN LARGEBORE IC ENGINES
【24h】

EFFECTS OF LINER SURFACE TEXTURING ON RING/LINER FRICTION IN LARGEBORE IC ENGINES

机译：衬里表面纹理化对大型IC引擎的环形/线性摩擦的影响

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Well-designed surface texturing may be used to reduce ring/liner friction and increase efficiency in internal combustion engines. This study investigated the effects of textures of either grooves or dimples on ring/liner friction, in the hydrodynamic and mixed regimes. Existing MIT models were used to conduct this research. The ring-pack model is based on averaged flow-factor Reynolds analysis, and is used in conjunction with a deterministic model for flow factor calculation. Although this advanced model is applicable in a wide range of cases, the surface textures studied here are very different than a typical liner surface, and can be represented only approximately by the averaged analysis upon which the ring simulation is based. For this reason, this analysis of surface features has focused on a parametric study, the goal of which is to analyze trends relating ring/liner friction to surface parameters, and to make a general evaluation of the potential of surface texturing to reduce ring-pack losses. In the hydrodynamic and mixed regimes, surface texturing affects the fluid pressure in the lubricant between ring and liner, thus affecting the ability of the oil film to support the ring load. If the effect of the texturing is to impede the flow of lubricant, the result will be an increase in oil film thickness. This causes friction reduction in two ways: if asperity contact was present, it is reduced; and the increase in film thickness causes a decrease in shear rate, thus decreasing oil shear stress. It was found that surfaces with both dimpled and grooved textures could cause friction reduction through this mechanism, with deeper features and more transverse groove patterns causing the greatest reduction. Friction also decreased with increasing area ratio (the percentage of the surface that is occupied by the surface features) for both grooves and dimples, and was only slightly dependent on groove width and dimple diameter. Because the effect of the surface texturing is on hydrodynamic effects in the oil, it is strongly coupled with lubricant properties. If surface texturing and lubricant viscosityrnare optimized together side effects such as oil consumption and wear can be mitigated, while friction can be reduced even further than it is via surface texturing alone. This possibility was also briefly considered in this study.
机译：精心设计的表面纹理可用于减少环/衬套摩擦并提高内燃机的效率。这项研究调查了在流体动力和混合状态下，凹槽或凹坑的纹理对环/衬套摩擦的影响。现有的MIT模型被用来进行这项研究。环形包装模型基于平均流量因子雷诺分析，并与确定性模型一起用于流量因子计算。尽管此高级模型适用于各种情况，但此处研究的表面纹理与典型的衬里表面有很大不同，并且只能近似地通过环模拟所基于的平均分析来表示。因此，这种表面特征的分析集中在参数研究上，其目的是分析与环/衬套摩擦力相关的趋势到表面参数的趋势，并对表面纹理化潜力进行总体评估以减少环堆积损失。在流体动力和混合状态下，表面纹理会影响环和衬套之间的润滑剂中的流体压力，从而影响油膜支撑环载荷的能力。如果纹理化的作用是阻碍润滑剂的流动，那么结果将是油膜厚度的增加。这可以通过两种方式减少摩擦：如果存在粗糙接触，则可以减少摩擦；如果存在粗糙接触，则可以减少摩擦。膜厚的增加导致剪切速率降低，从而降低了油剪切应力。发现具有凹坑和沟槽纹理的表面可通过该机制引起摩擦减小，具有更深的特征和更多的横向沟槽图案导致最大的减小。沟槽和凹坑的摩擦也随着面积比（表面特征所占表面的百分比）的增加而减小，并且仅略微取决于沟槽宽度和凹坑直径。因为表面纹理化的影响是对油中的流体动力学的影响，所以它与润滑性能密切相关。如果同时优化表面纹理和润滑剂粘度，则可以减轻诸如油耗和磨损的副作用，而与单独通过表面纹理化相比，可以进一步降低摩擦。在这项研究中也简要考虑了这种可能性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号