【作者】

Liyan Feng

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。The improvement of power performance of large 2-stroke marine engines results in increasingly high thermal load of combustion components, which is a great challenge on the engine reliability. In order to ensure reliability, the structure optimization based on thermal load analysis is necessary. The accurate temperature field analysis on combustion chamber components is prerequisite for precise thermal load. This paper introduces the CFD-FEA coupled analysis of temperature field of cylinder head and liner. With the aid of a 3-D CFD software, AVL-FIRE, the cooling water system of the engine was simulated, and the flow velocity distribution and heat transfer coefficient distribution of cooling water were output. Meanwhile, the working process of the engine was calculated to analyze the working fluid temperature in the combustion chamber and the heat transfer coefficient distribution in the working fluid side of the combustion chamber. The CFD simulation also provided the thermal boundary conditions of main surface in the working fluid side and cooling water side. The threedimensional finite element model of the cylinder head and liner was established. Based on the CFD-FEA couplingmethod, the thermal boundary conditions of the main surface provided by the CFD simulation were mapped to the surface unit of the elements in the Finite Element Analysis (FEA) model of the components. Then the temperature field of the coupled combustion chamber components was calculated. The simulation results include the steady temperature field and heat flux distribution under the rated operating condition. The results show that the temperature field is inhomogeneous along the circumferential direction and two high-temperature zones concentrate on the wall surface of the cylinder head. The thin-walled structure or cooling boreholes will increase the local heat flux, which improves cooling performance and reduces thermal load.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

4

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