The main operating characteristics of cylinder liner include the liner deformation and coolant flow. The insufficient coolant flow can lead to greater deformation of cylinder liner and hence worse engine performance and emissions performance. However, previous works have been done focusing on the characteristics of liner bore deformation and comprehensive coolant flow and the importance of the characteristics of different loads on liner deformation has not been recognized when analyzing cylinder liner. Therefore, the aim of this study is to reveal the characteristics of the coolant flow around cylinder liners and the effect of different loads on liner deformation. A simulation model of a diesel engine was developed to analyze coolant flow characteristics, deformation, and temperature distribution of cylinder liners in steady-state conditions. The effects of thermal stress, bolt preload, firing pressure, and piston side thrust on deformations of cylinder liners were analyzed in various designed conditions based on simulation results. It is found from the analysis results that the temperature of the cylinder liners gradually decreases from the top to the bottom. Meanwhile, the temperature gradient of the upper portion of the cylinder liner is greater than that of the middle portion or the bottom portion due to uneven distributions of the coolant flow in the cooling water jackets of different cylinder liners. In addition, the coolant flow velocity in the valve bridge area is lower than the target value. The expansion and compression deformations of the liner 1 and liner 4 are greater than those of other two liners, and the comprehensive deformation trends of different cylinder liners are similar in various loading conditions. The thermal load has the greatest impact on liner deformation because the total liner deformation contributed by the impacts of different types of loads looks similar to the liner deformation caused by only the thermal load.

缸套的主要工作特性包括缸套变形和冷却液流量。冷却液流量不足会导致气缸套变形更大，从而导致发动机性能和排放性能变差。然而，以前的工作主要集中在缸套孔变形和综合冷却液流动的特征上，并且在分析缸套时没有认识到不同载荷的特征对缸套变形的重要性。因此，本研究的目的是揭示缸套周围冷却液流动的特征以及不同载荷对缸套变形的影响。开发了柴油发动机的仿真模型，以分析稳态条件下气缸套的冷却剂流动特性、变形和温度分布。基于仿真结果，分析了不同设计工况下热应力、螺栓预紧力、点火压力和活塞侧推力对缸套变形的影响。从分析结果可以看出，气缸套的温度从上到下逐渐降低。同时，由于不同汽缸套的冷却水套中冷却液流量分布不均，汽缸套上部的温度梯度大于中部或底部的温度梯度。此外，阀桥区域的冷却液流速低于目标值。内胆1和内胆4的膨胀和压缩变形大于其他两个内胆，不同缸套在不同载荷条件下的综合变形趋势相似。热载荷对衬管变形的影响最大，因为不同类型载荷的影响造成的总衬管变形看起来类似于仅由热载荷引起的衬管变形。