CAJ | 학술논문

为了探究可变膨胀比往复活塞式膨胀机有机朗肯循环系统对柴油机尾气余热利用的影响程度，基于某6缸增压柴油机构建GT-power仿真模型，在13工况下仿真并分析有机工质蒸发压力、膨胀比等与余热回收系统膨胀机效率和当量回收效率的关系。结果表明，膨胀比一定时，膨胀机输出的功率、效率及当量回收效率随蒸发压力的上升而提升；蒸发压力一定时，，膨胀机效率和当量回收效率随膨胀比上升先升高后降低；最佳的蒸发压力和膨胀比匹配可充分发挥有机朗肯循环余热回收系统潜力。
위료탐구가변팽창비왕복활새식팽창궤유궤랑긍순배계통대시유궤미기여열이용적영향정도，기우모6항증압시유궤구건GT-power방진모형，재13공황하방진병분석유궤공질증발압력、팽창비등여여열회수계통팽창궤효솔화당량회수효솔적관계。결과표명，팽창비일정시，팽창궤수출적공솔、효솔급당량회수효솔수증발압력적상승이제승；증발압력일정시，，팽창궤효솔화당량회수효솔수팽창비상승선승고후강저；최가적증발압력화팽창비필배가충분발휘유궤랑긍순배여열회수계통잠력。
In order to study the effect of organic Rankine cycle system of reciprocating piston expansion engine with variable expansion ratio on the exhaust gas waste heat utilization, a GT-power simulation model is built based on a 6-cylinder turbocharged diesel engine to analyze the relationship between the organic working medium evaporation pressure and expansion ratio on the expansion engine efficiency and equivalent recovery efficiency of the waste heat recovery system. Results show that with the specific expansion ratio, the output power, efficiency and recovery efficiency of the expansion engine increase with the rise of evaporation pressure. While with the specific evaporation pressure, efficiency and equivalent recovery efficiency of the expansion engine increase firstly and then decrease with the rise of expansion ratio. Thus, the optimum matching between evaporating pressure and expansion ratio can make full use of the potential of waste heat recovery system of organic Rankine cycle.