爆震燃气轮机的变比热容热力循环性能

Thermodynamic cycle performance of detonation gas turbine with variable specific heat capacity

为分析变比热容下爆震燃气轮机的热力循环性能,建立了考虑比热容随工质成分及温度变化的爆震燃气轮机热力循环模型,分析中同时考虑了压气机、燃烧室、透平等部件的效率.在不同比较条件下,利用变比热容法对比分析研究了燃气轮机爆震循环(DCGT)、Brayton循环和Humphrey循环燃气轮机的热力循环性能.计算结果表明:与Brayton循环相比,DCGT具有较大性能优势;在透平前温度为1 620K且压比为16.5时,DCGT热效率较Brayton循环高28.8%;在无量纲吸热量为4.25且压比为16.5时,DCGT热效率则较Brayton循环高30.7%.

In order to analyze the thermodynamic cycle performance of detonation gas turbine with variable specific heat capacity,the thermodynamic cycle model of detonation gas turbine was established by considering the specific heat capacity varying with the composition and temperature of the working fluid,as well as the efficiency of the compressor,combustor,turbine and other components.Under different comparison conditions,the thermodynamic cycle performances of detonation cycle of gas turbine（DCGT）,Brayton cycle and Humphrey cycle gas turbine were analyzed by using variable specific heat capacity method.The results show that the performance of DCGT is better than that of Brayton cycle.When the turbine inlet temperature is 1 620 Kand the pressure ratio is 16.5,the thermal efficiency of DCGT is increased by 28.8% compared with Brayton cycle.When the dimensionless absorbed heat is 4.25 and the pressure ratio is 16.5,the thermal efficiency of DCGT is 30.7%higher than Brayton cycle.