Performance Optimizations with Single-, Bi-, Tri-, and Quadru-Objective for Irreversible Atkinson Cycle with Nonlinear Variation of Working Fluid’s Specific Heat

Considering nonlinear variation of working fluid’s specific heat with its temperature, finite-time thermodynamic theory is applied to analyze and optimize the characteristics an irreversible Atkinson cycle. Through numerical calculations, performance relationships between cycle dimensionless power density versus compression ratio thermal efficiency are obtained, respectively. When design parameters take certain values, differences reversible, endoreversible cycles compared. The maximum volume ratio, pressure under conditions output Based on NSGA-II, single-, bi-, tri-, quadru-objective optimizations performed when used as optimization variable, output, efficiency, ecological function, objectives. deviation indexes obtained based LINMAP, TOPSIS, Shannon entropy solutions different combinations By comparing tri- single-objective function density, it found that multi-objective smaller, solution desirable. comparison results show LINMAP optimized objective functions, index 0.1247, this combination most ideal.