中冷后回热式布雷顿-逆布雷顿联合循环

摘要

A configuration of combined intercooled regenerative Brayton and inverse Brayton cycles with regeneration after the inverse cycle was proposed ,and its thermodynamic model was established .The first law of thermodynamic was analyzed and optimized for the combined cycle . The analytical formulae of thermal efficiency and specific work were derived .The two cases with fixed and variable total pressure ratios were discussed ,and the intercooling pressure ratios were optimized .The effects of the main design parameters on the general and optimal performances of the cycle were analyzed by detailed numerical examples .It is found that there exist two optimal intercooling pressure ratio corresponding to the maximum efficiency and the maximum specific work ,respectively ,and two optimal total pressure ratio corresponding to the maximum efficiency and the maximum specific work ,respectively .When the total pressure ratio is large enough ,the optimum pressure ratio of the bottom cycle is less than 1 and the compressor 3 can be cancelled at this time .%提出了中冷后回热式布雷顿‐逆布雷顿联合循环构型，建立了其热力学模型。对该模型进行了热力学第一定律分析与优化，推导出了热效率和比功的解析式，讨论了总压比给定和总压比变化两种情形，优化了中间压比，通过数值计算详细分析了各主要设计参数对循环一般性能和最优性能的影响。发现存在最佳的中冷压比使循环效率和比功获得最大值；存在最佳的总压比使循环效率和比功获得最大值；在总压比较大时，底循环最佳压比小于等于1，此时压气机3可以取消。