为验证自由活塞内燃发电机摩擦损失小的潜在优势,建立了活塞环混合润滑模型.通过数值求解,分别获得了同缸径的曲轴式内燃机和自由活塞内燃发电机的活塞环与缸套间的油膜厚度、摩擦力和摩擦功率.对比分析表明,两者的活塞环油膜厚度相近,平均摩擦功率近似相等.自由活塞的活塞环摩擦力峰值较大,持续时间较短.如果考虑凸轮、曲轴等其他部件的摩擦损耗,则在总机械摩擦损失方面,自由活塞内燃发电机相比曲轴式内燃机具有显著优势.%In order to validate the potential advantage of low friction loss for free-piston engine generators, a hybrid lubrication model of the piston ring was established. The thickness of oil film, friction force and friction loss power in both crankshaft engines and free-piston engine generators with the same cylinder diameter were obtained through the numerical simulation. The comparison analysis indicates that their oil film thickness is close with the similar average power of friction losses. The peak friction force of the free-piston ring is greater than that in crankshaft but its duration is shorter. In terms of the total friction loss, the free-piston engine generator will have a significant advantage if the losses of other components such as the cam and crankshaft in crankshaft engines are considered.
展开▼
