Effects of Ring Pack Friction Heat on Temperature Fields of Piston Set-Liner

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Effects of Ring Pack Friction Heat on Temperature Fields of Piston Set-Liner

Zhou, Long / Sun, Guang Hua / Guo, Ying Ying / Bai, Min Li

To investigate the temperature fields of piston set-liner under the friction heat of ring pack, it is established a friction heat allocation model of ring pack based on the heat transfer theory of semi-infinite body. In this model, the piston ring, lubrication film and liner are treated as a three-layer medium. Furthermore, the distribution model of ring pack friction heat, the unsteady heat-mixed lubrication and friction model of piston ring-liner, and the heat transfer model of piston assembly-liner are also built and coupled with the allocation model to develop a coupled heat transfer model of piston set-liner. Employing the model for 6110 diesel engine, the effects of ring pack friction heat on the temperature fields of piston set-liner are simulated. Numerical results demonstrate that the friction heat allotted to the piston ring, lubrication film and liner accounts for nearly 47 %, 21 % and 32 % of ring pack friction heat, respectively. Due to the effects of friction heat, the maximum temperature rises on the piston ring, piston and liner surfaces run approximately up to 8.5 °C, 5 °C and 5 °C, separately. The established allocation and distribution models related to friction heat in this paper can be applied to any type of piston set-liner and provide the theoretical foundation for the optimal design of piston ring-liner.