混合工质对车用内燃机余热回收系统的影响

摘要

通过试验对1台标定功率为280 kW的车用内燃机全工况范围内排气能量的变化规律进行了分析，设计了一套有机朗肯循环余热回收系统，研究了车用内燃机不同工况下有机朗肯循环余热回收系统的工作性能。以典型干工质R245fa和典型湿工质R152a为组元，配制了3种不同类型的非共沸混合工质，研究了变浓度非共沸混合工质对车用内燃机有机朗肯循环余热回收系统性能的影响。研究结果表明，随着车用内燃机转速和扭矩的增加，有机朗肯循环余热回收系统的净输出功率、余热回收效率及所需的非共沸混合工质的质量流量均逐渐增加；R152a含量最高的非共沸混合工质性能最优。%The exhaust energy of 280 kW vehicle internal combustion engine in the whole conditions was analyzed by the ex-periment .A set of organic Rankine cycle system was designed and its working performance was analyzed under different engine operating conditions .Based on R245fa dry substance and R152a wet substance ,three zeotropic mixtures were prepared .The influence of zeotropic mixtures with different composition on the organic Rankine cycle waste heat recovery system performance was investigated .The results showed that the net power output ,waste heat recovery efficiency and required zerotropic mixture mass flow of organic Rankine cycle system increased gradually with the increase of engine speed and torque .The performance of zeotropic mixture containing the highest content of R152a was optimal .