Experimental study on the influence of cracked kerosene gas temperature on the propagation characteristics of rotating detonation waves

Abstract

The product of kerosene pre-combustion pyrolysis is typically used as the fuel for rotating detonation, and pure air at an ambient temperature is used as the oxidizer. The temperature of cracked kerosene gas (CKG) is determined by changing the supply conditions of the pre-combustion chamber. Therefore, the influence of the CKG temperature on the detonation range and rotating detonation wave (RDW) propagation was determined in this study. The experimental results show that the initiation delay time decreases with increasing CKG temperature. The temperature of CKG increased from 633 to 980 K, and two modes of RDW propagation appeared: the single rotating detonation wave (SRDW) and intermittent single rotating detonation wave (ISRDW) modes. In the temperature range of each propagation mode, the RDW velocity increased with the CKG temperature. Moreover, the average pressure of RDW propagation decreased with increasing CKG temperature. The stability of RDW propagation was reduced mainly because the propagation mode was changed to ISRDW. Thus, increasing the CKG temperature widens the range of CKG and air initiation. Moreover, the equivalent ratio interval of RDW propagation in the SRDW mode increases from low to high with an increase in the CKG temperature.