Affiliation:
1. School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
2. Sichuan Aerospace Zhongtian Power Equipment Co., Ltd., Chengdu 610100, China
Abstract
An aircraft/engine integrated optimal control method is proposed for turbine-based combined cycle (TBCC) engines based on the Gauss pseudospectral method. The optimal flight trajectory and TBCC control law are obtained for a TBCC-powered aircraft, and the “thrust trap” that occurs during turbo-ramjet mode transition is further analyzed and suppressed. Results show that the aircraft goes through the mode transition phase using a “climb-dive” trajectory, which is a strategy of applying gravity-assist and temporarily reducing the drag. Furthermore, the TBCC engine adjusts at the quickest rate to minimize thrust loss. With the coupling of the trajectory and TBCC control law, the minimum thrust during the mode transition is only 23% of the thrust before the mode transition, suggesting the “thrust trap” phenomenon. By decreasing the mode transition time from 60 s to 15 s, the minimum thrust can only increase to 30%, and the “thrust trap” phenomenon cannot be effectively suppressed. When the operating speed range of the turbine engine increases from Ma2.5 to 2.9, the minimum thrust will reach 80%, and the “thrust trap” tends to level off.
Funder
National Natural Science Foundation of China
National Defense Basic Research Program of China
Applied Innovation Program of China Aerospace Science and Technology Corporation
Reference31 articles.
1. Hueter, U., McClinton, C., and Cook, S. (October, January 29). NASA’s advanced space transportation hypersonic program. Proceedings of the 11th AIAA/AAAF International Conference Space Planes and Hypersonics Systems and Technologies Conference, Orleans, France.
2. Survey on the mode transition technique in combined cycle propulsion systems;Huang;Aerosp. Sci. Technol.,2014
3. Recent research progress on airbreathing aero-engine control algorithm;Lv;Propuls. Power Res.,2022
4. Chen, M., Zhu, Z.L., Tang, H.L., Zhu, D.M., and Zhang, J. (2007, January 8–11). Mode transition study of turbine-based combined cycle engine concepts. Proceedings of the 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Menlo Park, CA, USA.
5. Goal programming for stable mode transition in tandem turbo-ramjet engines;Chen;Chin. J. Aeronaut.,2009