基于有机朗肯循环的车用柴油机排气余热回收系统性能分析

利用设计的有机朗肯循环系统回收某重型车用柴油机的排气能量,通过台架试验,获得了变工况下柴油机排气余热能分布特性。分析了有机工质蒸发压力、过热度以及柴油机工况变化对有机朗肯循环系统性能的影响,以系统净输出功率和热效率为优化目标,确定了适用于有机朗肯循环系统的最佳蒸发压力。研究结果表明,当有机工质蒸发压力为1.8 MPa时,有机朗肯循环系统的净输出功率最大可以达到12.69kW,热效率可以达到11.19%;将有机工质加热至过热状态并不能明显提高有机朗肯循环系统的净输出功率。

Performance Analysis for Waste Heat Recovery System of Vehicle Diesel Engine Based on Organic Rankine Cycle

An organic Rankine cycle (ORC) was designed to recover the exhaust energy from a heavy‐duty vehicle diesel en‐gine and the distribution of diesel engine waste heat under various operating conditions was acquired through the engine bench test .The effects of evaporation pressure ,superheated degree and diesel engine operating condition on the ORC system per‐formances were analyzed and the optimum evaporation pressure of the ORC system was determined by taking the net output power and thermal efficiency as the optimization objectives .The results showed that the maximum net output power of the ORC system was 12 .69 kW and the thermal efficiency was 11 .19% when the evaporation pressure was 1 .8 MPa .It was aslo found that the superheated state of working fluid could not improve the net output power of the ORC system effectively .