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Study on the coolant pressure of internal combustion engines through vibro-acoustical analysis of a real cylinder block structure

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Abstract

Liner cavitation is caused by water pressure fluctuation in the water coolant passage of internal combustion engines. The high-speed re-entrant jet and shock wave following the implosion of cavitation bubbles cause cavitation erosion on the wet cylinder liner surface. The present work proposes a numerical method to predict the water pressure fluctuation of engine systems considering acoustic features of water coolant passage. The effect of the geometry modification of water coolant passage is evaluated. The water coolant passage acoustic field is introduced into the engine system containing a crankcase, a gear case, a cylinder head and an injection pump. The water coolant pressure fluctuation and engine vibration are calculated for engine systems with different exciting forces. The cross-sectional pressure distribution of water coolant passage and the longitudinal pressure distribution along thrust side of liner at top dead center are discussed. It is revealed that the pressure distribution is influenced by certain acoustic modes. The pressure fluctuates strongly at the top dead center, which is conductive to bubble formation and explosion.

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Abbreviations

\(\mathbf{a }\) :

Modal response vector of engine block

\(\mathbf{b }\) :

Modal response vector of acoustic field

\(\mathbf{C }_\mathrm{A}\) :

Acoustic field damping matrix

\(\mathbf{C }_{S}\) :

Main bearing damping matrix

\(\mathbf{C }\) :

Damping matrix of coupled system

\(\tilde{\mathbf{C }}\) :

Modal damping matrix of coupled system

\(\mathbf{f }\) :

Forces acting on engine block

\(\mathbf{F }_\mathrm{S}\) :

Piston slap force

\(\mathbf{F }_\mathrm{G}\) :

Gas force

\(\mathbf{F }_\mathrm{I}\) :

Force from injection pump

\(\mathbf{F }_{C}\) :

Force from valve train

\(\mathbf{F }_\mathrm{GM}\) :

Force from gear mating

\(\mathbf{K }_\mathrm{A}\) :

Acoustic field stiffness matrix

\(\mathbf{K }_{S}\) :

Engine block stiffness matrix

\(\mathbf{K }\) :

Stiffness matrix of coupled system

\(\tilde{\mathbf{K }}\) :

Modal stiffness matrix of coupled system

\(\mathbf{M }_\mathrm{A}\) :

Acoustic field mass matrix

\(\mathbf{M }_{S}\) :

Engine block mass matrix

\(\mathbf{M }\) :

Mass matrix of coupled system

\(\tilde{\mathbf{M }}\) :

Modal mass matrix of coupled system

\(\mathbf{p }\) :

Acoustic pressure vector

\(\mathbf{S }\) :

Surface area matrix of boundary

\(\mathbf{x }\) :

Displacement vector of engine block

\(u _{n}\) :

Modal response of nth mode of coupled system

\(\omega\) :

Natural frequencies

\({ j }\) :

Imaginary quantity

\(\varvec{\varPhi }_{q}={[}\ldots ,\varvec{\phi }_{qn},\ldots {]}\) :

The mode shape matrix of engine block

\(\varvec{\varPsi }={[}\ldots ,\varvec{\psi }_{n},\ldots {]}\) :

The mode shape matrix of acoustic field

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Acknowledgements

The present study is financially supported by the Fundamental Research Funds for the Central Universities of China (N2003018, N170303011) and the National Science Foundation of China (U1760105).

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China

    Xiaoyu Wang & Yu Chen

  2. School of Biological Science and Medical Engineering, Southeast University, Nanjing, China

    Zheng Zhang

  3. School of Materials Science and Engineering, Northeastern University, Shenyang, China

    Yinglong Li

Authors
  1. Xiaoyu Wang
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  2. Zheng Zhang
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  3. Yu Chen
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  4. Yinglong Li
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Correspondence to Xiaoyu Wang.

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Technical Editor: José Roberto de França Arruda.

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Wang, X., Zhang, Z., Chen, Y. et al. Study on the coolant pressure of internal combustion engines through vibro-acoustical analysis of a real cylinder block structure. J Braz. Soc. Mech. Sci. Eng. 42, 167 (2020). https://doi.org/10.1007/s40430-020-2204-y

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  • DOI: https://doi.org/10.1007/s40430-020-2204-y

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