Power and Efficiency Characteristics of an Endoreversible Isothermal Heating Modified Miller Cycle
A new cycle,i.e.,isothermal heating modified Miller cycle,is proposed by improving the traditional Miller cycle.The endoreversible isothermal heating modified Miller cycle model is established by using the finite time thermody-namic theory.The relationship curves between cycle power and compression ratio,efficiency and compression ratio,as well as power and efficiency are derived.The effects of the cycle maximum temperature ratio,pre-expansion ratio,mod-ified Miller cycle ratio and heat transfer loss on cycle performance are analyzed,and the Miller cycle performances before and after modified are compared.The results show that the relationship curves between power and compression ratio and between efficiency and compression ratio are parabolic-like ones,while the relationship curve between power and effi-ciency is loop-shaped one.With the increases of pre-expansion ratio,maximum temperature ratio of cycle and modi-fied Miller cycle ratio,the cycle performance can be improved significantly.The performance of modified Miller cycle is obviously better than that of traditional Miller cycle.
finite time thermodynamicsisothermal heating modified Miller cycleoptimal performancepower outputthermal efficiencyperformance comparison
万方数据
维普
