According to the power requirements of wide-ranged aviation platforms,a new turbine-augmented combined cycle engine which balances acceleration and fuel economy was proposed in this study.The feasibility of achieving high acceleration and high specific impulse performance using a series connected configuration was initially clarified concerning both engine components and working principles.Firstly,wide-ranged performance of turbine-augmented mode and ramjet mode was assessed using the self-developed performance evaluation model.After that,three-dimensional simulations of typical flight conditions were conducted to ensure the accuracy of the self-developed model.Then,based on the calculations,the engine fueled by liquid oxygen(LO2)and liquid methane(LCH4)reached a specific impulse of approximately 800～1 000 s with a maximum specific thrust of 145 s when working with Mach 0 to 3.Besides,when working at ramjet mode with an equivalence ratio of 1.0,a specific impulse of more than 1 300 s was reached in a Ma4 flight condition and more than 1 000 s in Ma6.Secondly,a preliminary demonstration of the two-stage-to-orbit(TSTO)Astro vehicle based on the turbine-augmented combined cycle engine was carried out.The results have shown the previously mentioned engine can manage high-efficiency reusable space transportation missions with its outstanding wide-ranged acceleration performance.The combined cycle engine was also applicable in the propulsion system for wide-range airborne unmanned platforms covering subsonic to hypersonic speeds,enabling autonomous acceleration and ultra-high-speed cruise.Finally,critical technologies for engine manufacturing were sorted out and summarized.
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