Experimental study on propagation mode of rotating detonation wave with cracked kerosene gas and ambient temperature air

Abstract

In order to obtain propagation characteristics of a rotating detonation wave (RDW) of cracked kerosene gas (CKG) and ambient temperature air, a series of experiments were carried out at different cracking kerosene and air mass flow rates. The propagation mode of RDW was analyzed in detail, and the ignition range of CKG and air was evaluated. In the experiment, the propagation modes of rotating detonation mainly include the single rotating detonation wave (SRDW) mode, reversed single rotating detonation wave (RSRDW) mode, and mixed mode. In the mixed mode, SRDW and two-counter rotating detonation wave modes alternate. Combined with high-speed photography and pressure curve, the mechanism of mode transition of rotating detonation propagation is analyzed. The RSRDW mode is considered to be a transitional mode in the process of equivalence ratio change. The mixed mode is an unstable RDW propagation state due to the improper ratio of fuel and oxidizer. Based on a substantial number of experimental data, the ignition ranges of CKG are summarized. Under the experimental conditions in this paper, the equivalence ratio range of CKG that can be detonated is 0.63–0.99. RDW is favorable to be formed in the lean oil state. When the equivalence ratio is 0.99, the maximum RDW velocity is 1077.79 m/s. When the mass flow rate of cracking kerosene is 42 g/s, the ignition initiation range is widest. As the mass flow rate increases or decreases, the initiation range is gradually reduced.