基于热障涂层的发动机活塞组件-缸套减摩方案研究

袁晓帅; 刘战; 孟祥慧; 强慧; 熊毕伟; 郭昌明

doi:10.3969/j.issn.1001-2222.2022.02.008

车用发动机 >

2022 , Vol. 0 >Issue 2: 47

DOI: https://doi.org/10.3969/j.issn.1001-2222.2022.02.008

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基于热障涂层的发动机活塞组件-缸套减摩方案研究

袁晓帅 ,
刘战 ,
孟祥慧 ,
强慧 ,
熊毕伟 ,
郭昌明

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（1.中国北方发动机研究所（天津），天津 300400；2.上海交通大学，上海 200240）

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Low Friction Design of Engine Piston Assembly-Cylinder Liner Based on Thermal Barrier Coating

YUAN Xiaoshuai ,
LIU Zhan ,
MENG Xianghui ,
QIANG Hui ,
XIONG Biwei ,
GUO Changming

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(1.China North Engine Research Institute(Tianjin),Tianjin 300400,China;2.Shanghai Jiao Tong University,Shanghai 200240,China)

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摘要

降低摩擦损失是提高整机经济性并降低碳排放的有效途径。包括活塞环和活塞在内的活塞组件，工作条件恶劣，活塞组件-缸套系统的摩擦损失可占整机近50%。活塞组件往复运动过程中，在冲程的不同位置其速度不同，活塞组件-缸套的润滑模式也不同。在靠近上下止点处，较高的润滑油黏度对改善润滑和降低接触摩擦有利；在冲程中间处，更低的润滑油黏度对降低黏性摩擦有利。润滑油的黏度受温度影响很大。为了考察温度分布对活塞组件-缸套摩擦学性能的影响，本研究首先考虑润滑油温黏效应建立了活塞组件-缸套系统的润滑模型，用数值方法分析了不同的热障涂层方案对缸套温度分布和对活塞组件-缸套摩擦学性能的影响。分析结果表明，热障涂层在改善缸套温度分布和降低系统摩擦损失方面具有显著的效果。

关键词： 热障涂层; 温度分布; 温黏特性; 活塞; 气缸套; 减摩设计

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袁晓帅 , 刘战 , 孟祥慧 , 强慧 , 熊毕伟 , 郭昌明 . 基于热障涂层的发动机活塞组件-缸套减摩方案研究[J]. 车用发动机, 2022 , 0(2) : 47 . DOI: 10.3969/j.issn.1001-2222.2022.02.008

Abstract

Reducing friction loss is an effective way to improve fuel economy and reduce carbon emission of internal combustion engine. Piston assembly including piston ring and piston has harsh working conditions and the friction loss of piston assembly-cylinder liner can account for nearly 50% of the whole engine friction loss. During the reciprocating movement process of piston assembly, the velocities are different at different positions of stroke, and the corresponding lubrication modes are also different. The higher viscosity of lubricating oil is beneficial to improving lubrication and reducing contact friction near the top and bottom dead center, and the lower viscosity of lubricating oil is beneficial to reducing viscous friction in the middle of stroke. The viscosity of lubricating oil is greatly affected by temperature. In order to investigate the influence of temperature distribution on tribological property, the lubrication model of piston assembly-cylinder liner were established with considering the oil viscosity effect, and then the influences of different thermal barrier coating schemes on the temperature distribution of cylinder liner and the tribological property of piston assembly-cylinder liner were analyzed by using numerical method. The analysis results show that the thermal barrier coating has a significant effect on improving the temperature distribution of cylinder liner and reducing the friction loss of system.

Key words： thermal barrier coating; temperature distribution; temperature-viscosity characteristic; piston; cylinder liner; low friction design

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