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中文摘要：
考虑实际动力装置的尺寸约束,基于有限时间热力学的思想建立了具有压降不可逆性的开式微型燃气轮机外燃循环模型。在该模型中,工质在流动过程中将依次遭遇8种流动阻力。这些流动阻力均为压气机入口相对压降的函数,并且控制着质量流率和循环输出功率。导出的循环输出功率、效率及其它的一些参数的表达式表明,调整质量流率可以优化开式微型燃气轮机外燃循环的热力学性能。分析表明,存在最佳的质量流率使循环输出功率最大,该最大功率对应于压气机压比存在附加最大值。给定动力装置燃油消耗和总尺寸的情况下,通过合理分配压气机入口和涡轮机出口之间的流通面积,可以进一步使循环功率效率最大化。
英文摘要：
A thermodynamic model for an open cycle of externally fired micro gas turbine with pressure drop irreversibilities is established based on finite-time thermodynamics considering the size constraints of real plant.There are eight flow resistances encountered by the working fluid stream for the cycle model.These resistances associated with the flow through various cross-sectional areas are derived as functions of the compressor inlet relative pressure drop,and control the airflow rate and the net power output.The analytical formulae about the power output,efficiency and other coefficients are derived,which indicate that the thermodynamic performance for an open cycle of externally fired micro gas turbine can be optimized by adjusting the mass flow rate.It is shown that there are the optimal air mass flow rates which maximize the net power output whose max.output has additional max.value with respect to the compressor pressure ratio.When the optimization is performed with the constraints of the fixed fuel flow and the plant size,the net power output,efficiency of the cycle can be maximized again by properly allocating the fixed flow area between the compressor inlet and the turbine outlet.
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