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

Author

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  • Lei Hu

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    Laboratory of Electronic Control System for Low-Speed Engine, National Engineering Laboratory of Power Systems of Ships and Ocean Engineering, Wuhan 430063, China
    Key Laboratory of Marine Power Engineering and Technology under Ministry of Transport of People’s Republic of China, Wuhan 430063, China)

  • Jianguo Yang

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    Laboratory of Electronic Control System for Low-Speed Engine, National Engineering Laboratory of Power Systems of Ships and Ocean Engineering, Wuhan 430063, China
    Key Laboratory of Marine Power Engineering and Technology under Ministry of Transport of People’s Republic of China, Wuhan 430063, China)

  • Yonghua Yu

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    Laboratory of Electronic Control System for Low-Speed Engine, National Engineering Laboratory of Power Systems of Ships and Ocean Engineering, Wuhan 430063, China
    Key Laboratory of Marine Power Engineering and Technology under Ministry of Transport of People’s Republic of China, Wuhan 430063, China)

  • Fei Dong

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

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.

Suggested Citation

  • Lei Hu & Jianguo Yang & Yonghua Yu & Fei Dong, 2020. "Analysis and Optimisation of Thermo-Mechanical Coupling Load of Cylinder Head Considering Fluid-Structure Interaction for a Marine High-Power Diesel Engine," Energies, MDPI, vol. 13(14), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:14:p:3597-:d:383730
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    References listed on IDEAS

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    1. Krishnamoorthi, M. & Malayalamurthi, R., 2018. "Availability analysis, performance, combustion and emission behavior of bael oil - diesel - diethyl ether blends in a variable compression ratio diesel engine," Renewable Energy, Elsevier, vol. 119(C), pages 235-252.
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