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Modelling and evaluating piston slap-induced cavitation of cylinder liners in heavy-duty diesel engines.
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Department of Vehicle Engineering, Taiyuan University of Technology, China
Weichai Power Co., Ltd., China
Centre for Efficiency and Performance Engineering, University of Huddersfield HD1 3DH, United Kingdom
Submission date: 2023-04-04
Final revision date: 2023-05-23
Acceptance date: 2023-07-14
Online publication date: 2023-07-19
Publication date: 2023-07-19
Corresponding author
Tie Wang   

Department of Vehicle Engineering, Taiyuan University of Technology, Taiyuan, China
Eksploatacja i Niezawodność – Maintenance and Reliability 2023;25(3):169644
  • A quantitative assessment method for cylinder liner cavitation risk is proposed.
  • There is a nonlinear relationship between liner vibration and coolant pressure.
  • The thin liquid layer will lower the threshold for triggering cavitation.
  • Cylinders with higher mode shape coefficients have a higher risk of cavitation.
  • Reducing piston-liner clearance and proper piston pin offset can help reduce the cavitation risk.
Cavitation erosion of cylinder liner seriously affects the operational reliability and service life of heavy-duty diesel engines. The accuracy of the modeling-based cavitation risk evaluation is limited by the unclear correspondence between cylinder liner vibration and coolant cavitation. This report is intended to investigate the correspondence between cylinder liner vibration and coolant pressure by combining vibration cavitation test, pressure gradient calculation, and visualization observation. The cavitation risk of the cylinder liner under piston slap is also quantitatively analyzed based on the nonlinear structural dynamics model. The results show that the occurrence of cavitation will cause a nonlinear relationship between the cylinder liner acceleration and the coolant pressure. The difference in cavitation risk for each cylinder is related to the structural modal characteristics of the crankcase. In addition, the effect of piston-liner clearance and piston pin offset on the cavitation risk is investigated based on the dynamics model.
This work was supported by the National Natural Science Foundation of China (NO. 51805353) and Research Project Supported by Shanxi Scholarship Council of China (NO. HGKY2019041).