Hyperbar复合发动机是一种高增压、低压缩比并具有旁通补燃系统的涡轮复合发动机,其特点是在不过分增加热负荷和机械负荷的条件下,可以大幅度地提高功率,并能明显地改善发动机的加速特性和扭矩特性。本文对此新型复合发动机循环进行第二定律分析。文中计算了各种不可逆因素导致的(火用)损失,研究了(火用)效率与平均压力随各主要参数的变化规律,并指出改善发动机性能的途径。本文的研究成果对于合理应用及发展 The Hyperbar compound engine is a turbocharged, low compression ratio, turbo compound engine with a by-pass afterburner system that features significantly increased power without excessive heat and mechanical loading, Significantly improve the engine’s acceleration and torque characteristics. This paper analyzes the second law of the new compound engine cycle. In this paper, the exergy loss caused by various irreversible factors is calculated. The variation of exergy efficiency and average pressure with each main parameter is studied. The ways to improve engine performance are also pointed out. The research results of this paper are reasonable for the application and development