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Analysis of out-of-round deformation of a dry cylinder liner of a non-road high-pressure common-rail diesel engine based on multi-field coupling
Journal of the Brazilian Society of Mechanical Sciences and Engineering ( IF 2.2 ) Pub Date : 2021-01-04 , DOI: 10.1007/s40430-020-02737-0
Yuhua Bi , Peng Wang , Li Luo , Hui Wang , Qianfan Xin , Jilin Lei , Lizhong Shen

The deformation of cylinder liner directly affects the sealing performance of the friction components in internal combustion engines, resulting in high oil consumption, engine power loss, and high-particulate matter emissions. Previous research works focused more on deformation of the wet vehicular cylinder liners, however, the effects of different loads on the dry liner deformation is not clear yet. A non-road high-pressure common-rail diesel engine was selected as the research object, and a coupled model of the engine was developed based on fluid–solid coupled heat transfer theory. After the accuracy of the model was verified by temperature measurement of the cylinder head and cylinder liner, deformation of the dry cylinder liner was studied. The results show that the axial and radial deformations of the cylinder liner are not uniform under the bolt preload condition. Large deformation occurs at the first liner and fourth liner, with the maximum deformation occurring at the top of fourth liner for 10.14 μm. Under the condition of thermal load, the temperature of cylinder liner exhibits a distribution of three-segments from the top to bottom. The liner deformation is not uniform, and the maximum deformation occurs at the top of the fourth liner for 304 μm. The radial deformations of all four cylinder liners present a symmetrical structure of a “heart” shape with respect to the centerline of the second and third cylinders. The axial deformation of each liner exhibits a “barrel” shape which is convex in the middle and narrow at the two ends.



中文翻译:

基于多场耦合的非道路高压共轨柴油机干缸套非圆变形分析

气缸套的变形直接影响内燃机中摩擦部件的密封性能,从而导致高油耗,发动机功率损失和高微粒排放。先前的研究工作更多地集中在湿式车辆气缸套的变形上,但是,尚不清楚不同载荷对干式气缸套变形的影响。以无路高压共轨柴油机为研究对象,并基于流固耦合传热理论建立了发动机的耦合模型。在通过汽缸盖和汽缸套的温度测量验证了模型的准确性之后,研究了干式汽缸套的变形。结果表明,在螺栓预紧条件下,缸套的轴向和径向变形不均匀。大变形发生在第一衬管和第四衬管,最大变形发生在第四衬管的顶部,持续时间为10.14μm。在热负荷条件下,缸套温度从上到下呈现出三段式分布。衬板变形不均匀,最大变形发生在第四衬板顶部,持续304μm。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。大变形发生在第一衬管和第四衬管,最大变形发生在第四衬管的顶部,持续时间为10.14μm。在热负荷条件下,缸套温度从上到下呈现出三段式分布。衬板变形不均匀,最大变形发生在第四衬板顶部,持续304μm。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。大变形发生在第一衬管和第四衬管,最大变形发生在第四衬管的顶部,持续时间为10.14μm。在热负荷条件下,缸套温度从上到下呈现出三段式分布。衬板变形不均匀,最大变形发生在第四衬板顶部,持续304μm。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。气缸套的温度从上到下呈现出三段式分布。衬板变形不均匀,最大变形发生在第四衬板顶部,持续304μm。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。气缸套的温度从上到下呈现出三段式分布。衬板变形不均匀,最大变形发生在第四衬板顶部,持续304μm。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。所有四个气缸套的径向变形相对于第二和第三气缸的中心线呈现出“心”形的对称结构。每个衬套的轴向变形呈现“桶形”形状,该形状在中间呈凸形,在两端呈窄形。

更新日期:2021-01-04
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