Power and efficiency characteristics of an endoreversible Miller cycle with non-ideal gas working fluid
Applying the finite-time thermodynamic theory,the optimal performance of an endoreversible Miller cycle with non-ideal gas working fluid is studied,and the general relationship between cycle power and efficiency and compression ratio is derived.Taking power and efficiency as objective functions,the effects of Miller's cycle ratio γM,heat transfer loss coefficient B,the maximum temperature ratio τ,and freedom degree of monatomic gas d on the cycle characteristics are analyzed,and the cycle performance differences between non-ideal gas and ideal gas under different specific heat models are compared.The results show that,with the increase of γM,the maximum power Pmax and the maximum efficiency ηmax both increase,the corresponding efficiency ηPmax under the Pmax condition first increases and then decreases,the corresponding compression ratios γP under the Pmax condition decreases,and the corresponding compression ratio γη under the ηmax condition first decreases and then increases.With the increase of B,ηmax,ηPmax and γη all decrease.With the increases of τ and d,Pmax,ηmax,ηPmax,γP and γη all increase.The specific heat models have no qualitative influence but only quantitative influence on the cycle performances,and the values of Pmax and ηmax under the specific heat model of the non-ideal gas condition are the minimum.
endoreversible Miller cyclefinite time thermodynamicsnon-ideal gaspowerefficiency
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