The propulsive performance of a high Mach-number combined cycle engine aircraft(CCEA)operating in a wide flight-range is affected by the flight conditions/attitude and mode transition,which further affects the flight mission performance.In order to evaluate the mission performance of the combined cycle engine aircraft as real and fast as possible,a fast evaluation method of the combined power aircraft mission-performance considering the mode transition was proposed,and the effects of different flight envelopes and different mode transition intervals on the flight mission performance were quantitatively studied.Firstly,the flight dynamics model of high Mach-number aircraft was established,and the flight attitude was taken into account in the mission analysis.Then the calculation model of non-installed and installed performance of the combined cycle engine was established,which can simulate the performance of the engine in real time in the flight envelop.Finally,a modal transition simulation model was established to analyze the effect of modal transition process on flight performance.The results indicate that the cruising altitude of the studied CCEA with Mach number of 5 increases from 20 km to 27 km,and increases by 18.3%.The total range increases by 21.9%.Furthermore,the modal transition interval shifts from low Mach numbers(Ma=2-2.3)to high Mach numbers(Ma=2.2-2.5).The climbing acceleration distance increases by 8.4%;the climbing acceleration time increases by 5.8%.
high Mach-number aircraftcombined cycle enginemode transitionflight trajectoryflight mission performance
维普
万方数据
