Performance analysis of RBCC-based TSTO space transportation systems via multi-objective design optimisation

Efficient and flexible space transportation systems are fundamental to the future success of routine scientific, commercial and strategic space missions. RBCC (rocket-based combined cycle) systems comprising rockets and airbreathing engines such as ramjet and scramjets are a reusable launch propulsion concept, offering considerable advantages for space transport over traditional propulsion in various aspects, including efficiency and flexibility. Multiobjective design optimisation studies have been performed for a conceptual RBCC-based TSTO (two-stage-to-orbit) system by means of evolutionary algorithms and trajectory optimisation with respect to important design criteria. The results highlight complex and nonlinear aerodynamic and propulsion characteristics, associated with numerous design characteristics, whilst evaluating the feasibility of the transportation system and providing physical insight into key design parameters with predominant influences identified by sensitivity analysis.