实际闭式燃气轮机回热循环热力参数数值分析

A NUMERICAL ANALYSIS ON THERMODYNAMIC PARAMETERS OF REAL CLOSED-CYCLE REGENERATED GAS TURBINE

关键词:  燃气轮机  闭合循环  热力学参数  数值分析

Key words:  Gas turbine  Closed cycle  Thermodynamic parameter  Numerical analysis

摘要:

用有限时间热力学方法分析实际循环性能，计入工质与高、低温热源间换热器和回热器的热阻损失和压气机、涡轮机中的不可逆压缩、膨胀损失，导出变温热源不可逆闭式燃气轮机回热循环的功率输出和热效率与循环压比间的解析式，给出了详细的数值算例说明各项损失对循环参数的影响特点。计算与分析表明，回热对循环功率输出有影响，高、低温侧换热器和回热器的有效度之间存在最佳匹配。

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.