二冲程船用低速机热流固耦合分析

本文以低速二冲程船用发动机为研究对象,通过建立发动机整机热流固耦合模型,结合燃烧侧和冷却侧边界条件,采用流体与有限元相结合的方法得出耦合场的温度分布,并考虑该工况下的螺栓预紧力和缸内爆压等机械载荷,进行热机耦合应力分析,讨论热负荷和机械载荷对整机应力分布的影响,并在所得应力场的基础上,对核心受热零部件缸盖进行了高低周疲劳分析。

Thermal-fluid-solid coupling analysis of two-stroke marine low-speed engine

A low-speed two-stroke marine engine is taken as the research object and the temperature distribution of the coupled field is obtained by establishing a fluid-solid coupling model, combining the boundary conditions on the combustion side and the cooling side. Considering the mechanical load such as bolt pre-tension and in-cylinder burst pressure under this working condition, the thermo-mechanical coupling stress analysis is performed, and the influence of thermal load and mechanical load on the stress distribution of the whole machine is discussed. Based on the obtained stress field, the high and low cycle fatigue analysis of the cylinder head is performed.