燃气驱动热泵系统的发动机性能优化

Performance optimization of engine in engine-driven heat pump

采用实验模型的方法,建立了燃气发动机的通用数学模型,并定义和构建了燃气热泵动力系统的燃气发动机的经济运行区。基于某改装后的燃气发动机的测试结果,利用此通用数学模型,解出了此发动机的万有特性曲线的数学函数,得出了此发动机的经济运行区的上边界线数学模型、下边界线数学模型以及最佳扭矩曲线的数学模型。分析结果表明,发动机的经济运行区参数为:发动机转速范围约为2300～3850 r.min-1,扭矩范围约为17.5～27.9 N.m,功率范围为5～9.5 kW。在此经济运行区内,发动机的热效率可保持在0.25以上,发动机热效率的极大值约为0.285。

The universal mathematical model of engine was established by the testing model of engine,and the economical operating zone of engine was presented and described.Based on the testing data of a refitted engine,the universal performance curve of the given engine had been obtained,and then economical upper bound and lower bound of the special economical operating zone of engine were demarcated,as well as the optimal torque curve.Analysis showed that in the special economical operating zone of engine,the speed range was about 2300—3850 r·min-1,the torque range was about 17.5—27.9 N·m,and output load region 5—9.5 kW,also the average thermal efficiency could be over 0.25,but the highest thermal efficiency of the engine could not exceed 0.285.