自由活塞内燃发电机能量转换与传递过程研究

根据能量守恒定律,建立自由活塞内燃发电机运行过程周期能量模型.通过计算获得一个周期内的能量转换规律,并分析相邻周期的能量传递过程,得到不同压缩比下的能量变化情况及其对性能的影响.分析结果表明,自由活塞内燃发电机能量转换有效效率的理论值可达40％.燃烧、扫气及散热等为能量损失的主要部分.连续运行过程中,一侧气缸作功行程后期的部分能量作为压缩能传递给另一侧,直接影响下一周期燃烧.压缩比变化对各能量及有效效率有不同影响,保持压缩能稳定对运行控制至关重要.

Energy Conversion and Transfer Process of Free-piston Engine Generator

Based on the law of conservation of energy, the energy model in each cycle of the free-piston generator was established. The energy conversion in one cycle was obtained and the transfer process in continuous cycles was analyzed. The rules of influence of different compress ratios on energy and performance were attained. The results showed that the brake efficiency of the free-piston generator could be 40% ideally. The loss in the combustion, scavenging and heat release was the big part of the whole. In the continuously running, much energy at the end of the power stroke in one cylinder was transferred into the other cylinder as the compress energy. It affected the next combustion. The effects with the compress ratio varying on energy conversion and brake efficiency were different. Keeping the compress energy stable was important for the operation control.