2023年第5期基于朗肯循环的发动机余热回收系统理论计算吴志军,柴晓霖,邓俊,吴静涛,高敏(同济大学汽车学院,上海201804)摘要:为了有效利用乘用车内燃机尾气中的余热,针对一台汽油机,利用Python程序及Refprop热力学参数库对朗肯循环换热过程进行建模。输入多种工况,计算所选的几种工质在不同的系统运行最高压力、不同的循环流量的余热回收系统中工作时的热效率和输出功率等特性,分析各工质的工作特点、适用工况等。最后对各工质进行比较,结果表明:在所选用的乘用车发动机各个工况下,当输入相同时,在水、乙醇、R245fa、R1234ze四种工质中,R1234ze均能输出最高的功率,但需要的工质流量较大;而水的效率始终最高。结合需要的工质流量考虑,水是更合适的工质选择。关键词:发动机;余热回收;朗肯循环;理论计算中图分类号:U464.1文献标识码:A文章编号:1674-957X(2023)05-0030-04TheoreticalCalculationofEngineWasteHeatRecoverySystemBasedonRankineCycleWuZhi-jun,ChaiXiao-lin,DengJun,WuJing-tao,GaoMin(SchoolofAutomotiveStudies,TongjiUniversity,Shanghai201804,China)Abstract:Inordertoutilizethewasteheatintheexhaustgasofinternalcombustionengineeffectively,programmedtomodeltheheattransferprocessofRankinecycleonagasolineengine.Underdifferentheatsourceinputs,thethermalefficiencyandoutputpowerofthewasteheatrecoverysystemarecalculatedaccordingtothemaximumoperatingpressureandflowallowedbyeachworkingmedium,inordertoanalyzetheworkingcharacteristicsandapplicableworkingcondi-tionsofeachworkingfluid.Resultshowsthatwhentheheatsourceinputisthesame,betweenwater,ethanol,R245faandR1234ze,R1234zeoutputsthehighestpower,butwithlagerworkingfluidflowrequired;wateralwayshasthehigh-estefficiency.Underthetypicalengineworkingconditionof3000rpm/min,watercanoutputupto1.1871kWwith11.6746%efficiency,under101kPa,30kg/hcirculatingflow;R1234zecanoutputupto1.4623kWwith9.8504%efficien-cy,under202kPa,70kg/hcirculatingflow.Consideringcomprehensively,waterisamoreappropriatechoice.Keywords:Engine;Wasteheatrecovery;Rankinecycle;Theoreticalcalculation基金项目:氩气循环氢发动机超稀薄燃烧特性和爆震抑制机理研究,上海市自然科学基金项目(22ZR1463000)作者简介:柴晓霖(1997—),男,山西省长治市,同济...
