【摘要】 为了提高内燃机能量利用率,自主研发了1台可用于有机朗肯循环余热回收系统的单气缸自由活塞膨胀机-直线发电机(FPE-LG)。在压缩空气试验平台上实现了FPE-LG的连续稳定运行,验证了单气缸FPE-LG工作原理的可行性。在大量试验基础上,分析了驱动压力、外接负载电阻对单气缸FPE-LG输出特性的影响机制。研究结果表明:FPE-LG输出功率呈现较为规律的正弦波动,对于该试验样机而言,当驱动压力为0. 6 MPa、外接负载电阻为50Ω时,峰值输出功率可达到58. 7 W;提高驱动压力可以明显提高均方根电压和峰值电流,但驱动压力的提高对FPE-LG自由活塞膨胀机膨胀功-直线发电机输出电能转换(简称功-电转换)效率影响很小;当外接负载电阻小于60Ω时,随着外接负载电阻的增大,FPE-LG的功-电转换效率从13. 4%上升到24. 7%;对于该FPE-LG而言,当外接负载电阻为60Ω时,单气缸FPE-LG的实际膨胀功最大,功-电转换效率最佳。更多还原

【Abstract】 A single cylinder free piston expander-linear generator（ FPE-LG） used for organic Rankine cycle（ ORC） waste heat recovery system is developed to improve the energy efficiency of the internal combustion engines. FPE-LG can operate continuously and stably under the condition of high driven pressure,which indicates that the working principle of single cylinder FPE-LG is feasible. The effects of driven pressure and external load resistance on the output characteristics of single cylinder FPE-LG are investigated through experiment. The experimental test results show that the power output of FPE-LG exhibits a regular sinusoidal fluctuation,and the peak power output can reach 58. 7 W when the drivenpressure is 0. 6 MPa and the external load resistance is 50 Ω. The increase in driven pressure can increase the RMS voltage and peak current significantly. However,it has little effect on the power-electric conversion efficiency of FPE-LG. When the external load resistance is less than 60 Ω,the power-electric conversion efficiency η of FPE-LG increases from 13. 4% to 24. 7% with the increase in external load resistance. When the external load resistance is 60 Ω,actual expansion work（ AEW）,W_AEW,of the single cylinder FPE-LG is the largest and the power-electric conversion efficiency is the best. The continuous increase in the external load resistance value has little effect on W_AEWand η.更多还原