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.

为了研究环套摩擦热作用下活塞对衬套的温度场，基于半无限体的传热理论，建立了环套摩擦热分配模型。在此模型中，活塞环，润滑膜和衬套被视为三层介质。此外，还建立了环组摩擦热的分布模型，活塞环-缸套的非稳态热混合润滑和摩擦模型以及活塞总成-缸套的传热模型，并与分配模型耦合以产生耦合热活塞固定衬套的传递模型。以6110型柴油机为模型，模拟了环组摩擦热对活塞副衬套温度场的影响。数值结果表明，摩擦热分配给了活塞环，润滑膜和衬套分别占环组件摩擦热的近47％，21％和32％。由于摩擦热的作用，活塞环上的最高温度升高，活塞和衬套表面的温度分别升高到大约8.5°C，5°C和5°C。本文建立的与摩擦热有关的分配和分布模型可以应用于任何类型的活塞衬套，并为活塞环衬套的优化设计提供理论基础。