Analysis and Optimisation of Thermo-Mechanical Coupling Load of Cylinder Head Considering Fluid-Structure Interaction for a Marine High-Power Diesel Engine

Lei Hu, Jianguo Yang, Yonghua Yu and Fei Dong
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Lei Hu: School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
Jianguo Yang: School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
Yonghua Yu: School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
Fei Dong: School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China

Energies, 2020, vol. 13, issue 14, 1-20

Abstract: A one-dimensional model of the diesel engine working process was established, and thermal boundary conditions of gases contacting with a cylinder head were determined by comparing them with the results of a routine test. A fluid-structure interaction model between the cooling water and cylinder head passages was established in which boundary conditions of cooling water were obtained by computational fluid dynamics analysis. Simultaneously, considering the pressure mechanical load in the cylinder, temperature and the stress distribution of the cylinder head were analysed by the model with a thermo-mechanical coupling load. The model was validated using the temperature hardness plug method. Four parameters of intake valve opening, exhaust valve opening, fuel supply beginning, and compression ratio were selected as influencing factors, and the thermo-mechanical coupling load of the cylinder head was optimised by the Taguchi and analysis of variance method subsequently. The study indicates that the error of the calculation model for the cylinder head’s thermal-mechanical coupling load is within ±1.5%, and the proportion of the thermal stress in the cylinder head thermal-mechanical coupling stress is above 90%. The fuel supply beginning has the greatest influence on the thermal load of the cylinder head. Based on the optimisation methods within the required power range, the maximum temperature and maximum thermo-structural coupling stress of the cylinder head are decreased by about 10.05 K and 7.13 MPa in the nose bridge area, respectively.

Keywords: cylinder head; thermal boundary conditions; fluid-structure interaction; thermo-mechanical coupling load; Taguchi method; analysis of variance method; optimisation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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