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Based on the irreversible Otto cycle model, applying finite-time-thermodynamic theory, this paper takes power and efficiency as the objective functions, further studies the cycle performance under the condition of non-ideal gas working fluid, analyzes the effects of different loss items and freedom degree ( d ) of monatomic gas on the cycle performance, and compares performance differences of ideal gas and non-ideal gas under different specific heat models. The results demonstrate that, with the increase of  d , the maximum-power-output ( P   max ), the maximum-thermal-efficiency ( η   max ), the corresponding optimal compression-ratio ((γopt)p${({\gamma }_{\text{opt}})}_{p}$) and efficiency ( ηP   ) at the  P   max  point, and the corresponding optimal compression ratio ((γopt)η${({\gamma }_{\text{opt}})}_{\eta }$) and power ( Pη   ) at the  η   max  point will all increase; the  P   max ,(γopt)p${({\gamma }_{\text{opt}})}_{p}$,  η   max ,(γopt)η${({\gamma }_{\text{opt}})}_{\eta }$,  ηp    and  Pη    will decrease with the increases of three irreversible losses; the specific heat model has only quantitative effect on cycle performance but no qualitative effect; under condition of non-ideal gas specific heat model, the power and efficiency are the smallest.

Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle