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首页> 外文期刊>International journal of structural integrity >Piston-ring performance: limitations from cavitation and friction
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Piston-ring performance: limitations from cavitation and friction

机译：活塞环性能：气蚀和摩擦的限制

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Purpose - Cavitation in piston-ring lubrication is studied as part of the performance of piston-ring assemblies. Cavitation degrades performance in engineering applications and its effect is that it alters the oil film pressure, generated at the converging-diverging wedge of the interface. Studies tried to shed light to the phenomenon of cavitation and compare it with cavities that have been identified in bearings. The paper aims to discuss this issue. Design/methodology/approach - Lubricant formulations were used for parametric study of oil film thickness (OFT) and friction providing the OFT throughout the stroke and LIF for OFT point measurements. Lubricant formulation affects cavitation appearance and behaviour when fully developed. Findings - Cavitation affects the ring load carrying capacity. Different forms of cavitation were identified and their shape and size (length and width) is dictated from reciprocating speed and viscosity of the lubricant. A clear picture is given from both techniques and friction results give quantifiable data in terms of the effect in wear and cavitation, depending on the lubricant properties. Research limitations/implications - Engine results are limited due to manufacturing difficulties of visualisation windows and oil starvation. Therefore, full stroke length sized windows were not an option and motoring tests were implemented due to materials limitations (adhesive and quartz windows). Lubricant manufacturer has to give data regarding the chemistry of the lubricants. Originality/value - The contribution of cavitation in piston-ring lubrication OFT, friction measurements and lubricant parameters that try to shed light to the different forms of cavitation. A link between viscosity, cavitation, shear thinning properties, OFT and friction is given.
机译：目的-研究活塞环润滑中的气穴现象是活塞环组件性能的一部分。空化作用会降低工程应用中的性能，其作用是会改变在界面的收敛-扩散楔形处产生的油膜压力。研究试图揭示空化现象，并将其与轴承中已发现的空洞进行比较。本文旨在讨论这个问题。设计/方法/方法-润滑剂配方用于油膜厚度（OFT）和摩擦的参数研究，提供了整个行程的OFT和用于OFT点测量的LIF。充分发展时，润滑剂配方会影响气蚀外观和性能。结果-空化会影响环的承载能力。识别出不同形式的气穴现象，并根据润滑剂的往复运动速度和粘度确定其形状和大小（长度和宽度）。两种技术都给出了清晰的图像，根据润滑剂的性能，摩擦结果就磨损和空化的影响提供了可量化的数据。研究的局限性/意义-由于可视化窗口的制造困难和缺油，发动机的性能受到限制。因此，不能选择全行程长度的窗口，并且由于材料的限制（粘合剂和石英窗口）而进行了汽车测试。润滑剂制造商必须提供有关润滑剂化学性质的数据。独创性/价值-气穴在活塞环润滑OFT，摩擦测量和润滑剂参数中的作用，试图阐明不同形式的气穴。给出了粘度，空化，剪切稀化特性，OFT和摩擦之间的联系。

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