An Adaptive Modeling Method of Hydrogen-fueled Turbojet Engine

In order to optimize the overall performance design and control algorithm of hydrogen-fueled aero-engines, it is necessary to develop a dynamic model that accurately reflects their characteristics. This study uses design point data of hydrogen-fueled turbojet engines and a limited amount of experiment data to construct a baseline model and an adaptive model. Firstly, based on the design point data, a baseline model is constructed using a component-level modeling method, and the physical properties of hydrogen combustion gas are corrected to improve the accuracy of the baseline model. Secondly, the dynamic characteristics of the hydrogen regulating valve are identified through experimental data, and the characteristics of this actuator are integrated into the model to more accurately reflect the dynamic characteristics of the hydrogen-fueled turbojet engine. Finally, based on the limited experimental data, the particle swarm optimization algorithm is used to select appropriate value of correction factors to improve the steady-state accuracy of the model. Validation results show that this method can quickly and effectively establish an accurate hydrogen-fueled aero-engine adaptive model based on limited experimental data. Under the same hydrogen flow rate, the maximum steady-state errors of speed and exhaust temperature are 2.35% and 2.07%, respectively.