车用内燃机变工况下有机朗肯循环系统性能的分析  

Effect of Organic Rankine Cycle under Automotive Diesel Engine Variable Conditions

作　　者：周启顺 杨凯[2] 

机构地区：[1]北京汽车动力总成有限公司,北京101108 [2]北京工业大学环境与能源工程学院,北京100124

出　　处：《内燃机工程》2014年第2期92-97,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(51376011);北京市教育委员会科技计划重点项目(KZ201410005003);国家"九七三"重点基础研究发展计划资助项目(2011CB707202)

摘　　要：通过试验和理论研究,得出了一台车用柴油机在全工况范围内可用排气能量的变化规律,据此设计了一套有机朗肯循环余热回收系统,分别采用纯工质R245fa和非共沸混合工质R416A作为系统的工作介质。针对车用柴油机有机朗肯循环联合系统,提出了有用功提升率评价指标。通过数值计算,研究了不同柴油机工况下,有机朗肯循环系统和联合系统工作性能的变化规律,得出了有机工质质量流量与柴油机可用排气能量的对应关系。研究结果表明:随着柴油机转速和转矩的增加,两种工质(纯工质R245fa和非共沸混合工质R416A)的有机朗肯循环系统的净输出功率均逐渐增加,最大值分别为30.39kW和28.03kW;两种工质的车用柴油机有机朗肯循环联合系统的有用功提升率最大分别为9.00%(纯工质R245fa)和9.70%(非共沸混合工质R416A);采用非共沸混合工质R416A的性能优于采用纯工质R245fa。An organic rankine cycle （ORC） system was designed to recover waste heat from a vehicle diesel engine using pure fluid R245fa and zeotropic mixture R416A as working medium. Taking power output increasing rate as measure to evaluate the diesel-ORC combined cycle system, the effects of the combined cy- cle system were analyzed under various engine conditions. Results show that with engine speed and torque in creasing, net power outputs of the combined cycle system using both two different working mediums in crease; the max. net power output increments are 30.39 kW for R416A and 28.03 kW for R245fa. Combined cycle system power output increasing rates using two working fluids, R416A and R245fa reach up to 9. 700/oo and 9.00% respectively. The effect is better when using zeotropic mixture R416A.

关 键 词：内燃机 车用柴油机 变工况 有机朗肯循环 余热回收 非共沸混合工质 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]