Turbine-based dual-combustor scramjet combined cycle propulsion(TBDC)is proposed for potential application to near-space flight vehicle and aerospace vehicle. For TBDC,an off-the-shelf turbo engine acts as the primary thrusters in the range of about Mach 0~2.5,and dual-combustor scramjet expanded performance for Mach 2.5~6+. Expansion of high performance at low speed and a wide working envelop under boundary has been studied,which could effectively solve the breakthrough in the thrust gap between turbo and ...