【摘要】 研究以变热容气体为工质的不可逆布雷顿热机循环的优化性能,导出循环的输出功率和效率的表达式,通过数值计算获得循环的一些重要优化特性曲线。结果表明,当布雷顿热机运行在压强比、热机效率、输出功率、工质的最低和最高温度的优化区间时,热机的性能最佳。变热容工质对上述优化区间的影响是显著的。更多还原

【Abstract】 The optimal performance of an irreversible Brayton heat engine with the variable heat capacity working substance is researched,and the expressions for the output power and efficiency of the cycle are derived. Some important optimal performance characteristic curves are generated through the numerical calculation. It is shown that the performance of Brayton heat engine is the best when running at optimal regions of the pressure ratio,efficiency,output power,the lowest and highest temperatures of the working substance. It is also found that the influence of the variable heat capacity working substance on the above optimal regions is remarkable.更多还原