开式燃气轮机中冷回热再热循环功率和效率优化

Power and Efficiency Optimization of an Open Intercooled-Recuperated-Reheat Gas Turbine Cycle

建立了开式燃气轮机中冷回热再热(ICRR)循环有限时间热力学模型,导出了循环功率和效率解析式,优化了气流沿通流部分的压降(或低压压气机进口空气质量流率)和中间压比,得到最大功率;并在给定燃油流率的情况下,优化了气流沿通流部分的压降和中间压比,得到最大热效率,进一步在给定低压压气机进口和动力涡轮出口总面积的情况下,优化两者面积分配比,得到双重最大热效率。

A thermodynamic model for open intercooled-recuperated-reheat （ICRR） gas turbine cycle is established by using finite-time thermodynamics, and the analytical formulae of the cycle＇s power and efficiency are derived. Also, the cycle maximum power is obtained by optimizing the relative pressure drop distribution of pressure losses along the flow path （or the air mass flow rate at the low-pressure compressor inlet） and the intercooling pressure ratio. Given a fixed fuel mass flow rate, the maximum cycle thermodynamic efficiency is obtained by optimizing the low-pressure compressor inlet relative pressure drop and the intercooling compression ratio. Furthermore, the double-maximum cycle thermodynamic efficiency is derived by optimizing the flow area distribution between the compressor inlet and the power turbine outlet subject to a fixed total area of the compressor inlet and the power turbine outlet.