The precooling technology is an effective way to expand the flight envelope of the turbine engine. To solve the problem of engine performance degradation caused by excessive fuel consumption, a new type of chemical precooled engine cycle is proposed, in which part of the heat energy from the incoming air is converted into the chemical energy by pyrolytic reaction. To evaluate the engine performance, a thermodynamic model is established. Based on this model, the experiments are performed to obtain the chemical heat sink of selected fuels. Through the simulation, it is found that the specific impulse is greatly improved because the fuel consumption is effectively reduced by introducing the chemical precooling process. Moreover, the highest operating Mach number (HOMN) of the precooled turbine channel is effected by different component parameters, among which the increase of the turbine inlet temperature has the most significant effect on rising the HOMN. Furthermore, the optimal fuel ratio can be obtained when the equivalence ratio is equal to 1.0, and the fuel consumption can be saved by 42% ~ 52% at this time. In general, the results in this paper are beneficial for developing high-performance turbine combined engines.

预冷技术是扩大涡轮发动机飞行范围的有效方法。为了解决由过度的燃料消耗引起的发动机性能下降的问题，提出了一种新型的化学预冷发动机循环，其中来自进入的空气的一部分热能通过热解反应被转化为化学能。为了评估发动机性能，建立了热力学模型。基于此模型，进行实验以获得所选燃料的化学散热器。通过仿真发现，由于引入了化学预冷工艺可以有效地降低燃料消耗，因此可以大大提高比冲量。此外，预冷涡轮通道的最高运行马赫数（HOMN）受不同的组件参数影响，其中，涡轮机入口温度的升高对HOMN的升高影响最大。此外，当当量比等于1.0时，可以获得最佳燃油比，此时燃油消耗可节省42％〜52％。总的来说，本文的结果对于开发高性能涡轮组合发动机是有益的。