Space Flight Demonstration of Rotating Detonation Engine Using Sounding Rocket S-520-31

Abstract

To create a new flyable detonation propulsion system, a detonation engine system (DES) that can be stowed in sounding rocket S-520-31 has been developed. This paper focused on the first flight demonstration in the space environment of a DES-integrated rotating detonation engine (RDE) using S-520-31. The flight result was compared with ground-test data to validate its performance. In the flight experiment, the stable combustion of the annulus RDE with a plug-shaped inner nozzle was observed by onboard digital and analog cameras. With a time-averaged mass flow of and an equivalence ratio of , the RDE generated a time-averaged thrust of 518 N and a specific impulse of , which is almost identical to the ideal value of constant pressure combustion. Due to the RDE combustion, the angular velocity increased by in total, and the time-averaged torque from the rotational component of the exhaust during 6 s of operation was . The high-frequency sampling data identified the detonation frequency during the recorded time as 20 kHz in the flight, which was confirmed by the DES ground test through high-frequency sampling data analysis and high-speed video imaging.