Operating mode of solid propellant air turbocharged rocket

Based on the current problems on SP-ATR, a new SP-ATR was proposed, in which afterburner rich fuel gas was added separately. A new model used for the new SP-ATR was presented through comparing the SP-ATR with the Ramjet and the Aerojet. By the model, the flight envelope of the SP-ATR was calculated, and the Ramjet and Aerojet's envelope was completely contained by the SP-ATR's, which means taht the SP-ATR has a wide working range. Then SP-ATR's performance were calculated in different heights and velocities. The results are as follows: firstly, with the increase of height and velocity, the SP-ATR's specific impulse and specific thrust increase, but its performance changs slightly with the changes in external ballistics, which means that the SP-ATR performance is stable. Secondly, in the height range of near-ground and low-level, SP-ATR could fulfill the request that its velocity could change from subsonic to supersonic and keep its specific impulse no less than 6 700 N·s/kg and specific thrust no less than 1 100 N·s/kg. Thirdly, in the high altitude, SP-ATR's working range is wide. Compared with the Ramjet, its specific impulse is the same as the Ramjet's and its specific thrust is as twice as the Ramjet's. Additionally, under the same flight velocity, its thrust increases with the increase of height, which means that SP-ATR has the ability to work in the higher altitude.