The invention discloses an
orbit injection method of a two-stage-to-
orbit spacecraft with reusable first-stage energy, comprising the steps of 1, modeling the two-stage-to-
orbit spacecraft, wherein the first stage is a skylon using an SABRE engine as a
power unit, and the second stage is a small
rocket having effective
payload that accounts for 5.89% of
takeoff total
mass; 2, carrying out a first-stage
takeoff phase; 3, carrying out a first-stage suction mode phase that allows climbing to 25 km in suction mode; 4, carrying out a first-stage
rocket mode phase, wherein the SABRE engine switchesto the
rocket mode and propels the two-stage-to-orbit
spacecraft to continuously
climb to 100 km, separating the first stage and the second stage, and allowing the first stage to return to the groundfor use in an unpowered glide mode; 5, carrying a second-stage
vertical climbing in the two-stage climbing phase, and delivering the effective
payload to a low-earth orbit of 300 km at the speed of 7700 m / s. With the technical difficult and launching cost comprehensively considered, two-stage-to-orbit is achieved based on the SABRE engine, while the first-stage energy is reusable; the effective
payload is significantly increased.