Direct connected experimental research on hydrocarbon-fueled rotating detonation

Direct connected tests of rotating detonation were performed with ethylene and room-temperature kerosene adopted as fuel. The corresponding flight Mach number is 5.0, and the Mach number is 2.5 at the isolator entrance. Results show that the rotating detonation wave was sustained after initiation with the equivalent ratio of ethylene ranging from 0.43 to 0.99. The propagation frequency of detonation waves is 5.32–6.42 kHz, with a propagation cycle of 0.156–0.188 ms. As the equivalent ratio increases, the propagation velocity of the detonation wave and the pressure in the detonation combustor increase almost linearly. While the averaged pressure peaks of the dynamic pressure（PCB pressure sensor） first increase and then decrease. The pressure at the isolator exit also increases under a higher equivalent ratio, but the velocity remains unchanged at Ma=2.5. When the equivalent ratio of kerosene was about 0.70, the rotating detonation wave was also sustained.