车用有机朗肯循环系统中计量泵的性能研究

PERFORMANCE STUDY ON METERING PUMP IN ORGANIC RANKINE CYCLES FOR AUTOMOBILE ENGINE

在模拟车用有机朗肯循环(organic Rankine cycle,ORC)系统的工作环境下,设计并搭建以R123作为工质的液压隔膜计量泵性能测试平台。在额定转速(2900 r/min)下,通过调节液压隔膜计量泵的冲程(25%、50%、75%、100%)和出口压力,得到变工况下液压隔膜计量泵的特性曲线,并分析液压隔膜计量泵的关键参数对车用ORC系统性能的影响情况。结果表明:液压隔膜计量泵的流量受冲程影响,与出口压力基本无关。其输入功率和实际运行效率均随着冲程的增加而升高,最高分别可达523.91 W、88.27%。应用该液压隔膜计量泵的模拟车用ORC系统吸热量变化范围较广,系统热效率最高可达12.81%。液压隔膜计量泵可应用于车用ORC系统,通过调节液压隔膜计量泵的冲程和出口压力,可实现提高车用ORC系统热效率、增加系统净输出功率的目的。

In this paper,a performance-testing platform of hydraulic diaphragm metering pump using R123 was designed and built under simulative organic Rankine cycle(ORC)conditions.By adjusting stroke and outlet pressure of the pump,characteristic curves of hydraulic diaphragm metering pump were obtained.The influences of key parameters of hydraulic diaphragm metering pump on the performance of the ORC system under variable operating conditions were analyzed.Results indicated that for hydraulic diaphragm metering pump the flow rate and outlet pressure are independent,Under variable operating conditions,the input power and the actual efficiency of hydraulic diaphragm metering pump increases with stroke,and the maximum value can reach to 523.91 W and 88.27%,respectively.The heat absorption of the ORC system has a wide range,and the maximum thermal efficiency of the ORC system can reach to 12.81%.Hydraulic diaphragm metering pump is more suitable for the ORC system under variable operating conditions.Coordinating the control of the hydraulic diaphragm metering pump stroke and the outlet pressure can improve the thermal efficiency of ORC system for automobile and increase the net output power of the ORC system.