Deflagration evolution characteristic and chemical reaction kinetic mechanism of JP-10/DEE mixed fuel in a large-scale tube

Abstract

As a high energy density hydrocarbon fuel, JP-10 is widely used in various types of engines. However, JP-10 also has problems such as not easy to ignite and incomplete combustion. DEE with good flammability and volatility can make up for the above shortcomings. In present work, a series of experiments were carried out to study the deflagration propagation characteristics of JP-10/DEE mixtures with different fuel ratios in a large-scale tube. The initial pressure wave induced by ignition and the deflagration flame front divide the flow field into an unreacted zone, a disturbance zone and a product zone. The propagation velocity of the flame front in the observation window is obtained by the Canny edge extraction procedure, and a secondary flame phenomenon is found as JP-10 slowly evaporates and ignites. With the increase of DEE concentration, the propagation speed of primary flame increases, the induction time of secondary flame is advanced. In addition, JP-10/DEE mixed fuel deflagration has a synergistic enhancement effect, and the maximum deflagration intensity is achieved when fuel ratio is 0.6. The maximum flame temperature of JP-10/DEE mixed fuel deflagration is 1660 °C, and the fastest flame propagation speed is about 97 m/s. Moreover, the adiabatic flame temperature of the JP-10/DEE gas-phase mixture decreases with the increase of DEE concentration, but the system is more easily ignited, and the emission of incomplete combustion products decreases.