关键词: 燃气轮机;闭合循环;热力学参数;数值分析

Abstract: performance analysis of a real power cycle has been carried out using method of finite-time thermodynamics. The analytical formulas about the relations between poweroutput and pressure ratio, efficiency and pressure ratio in an irreversible closed gas turbine regenerated cycle coapled to variable-temperature heat reservoirs are derived. In the analysis, the irreversibities imply heat vesistance losses in the heat exchangers and expansion/compression losses in turbine and compressor. The effects of those losses on performace characteristics of the cycle are illustrated with detailed numerical examples. It is shown that the power output of the cycle is strongly dependent on the effectiveness of the regenerator and that there is an optimal matching in effectivenesses between the high/low temperature side heat exchangers and the regenerator.

Key words: Gas turbine;Closed cycle;Thermodynamic parameter;Numerical analysis