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

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 degrees 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.

Automated summary

In this study, the deflagration propagation characteristics of JP-10/DEE mixtures were investigated through experiments. It was found that DEE can compensate for the ignition difficulty and incomplete combustion of JP-10, and has a synergistic enhancement effect. The results showed that with the increase of DEE concentration, the propagation speed of the primary flame increased, the induction time of the secondary flame was advanced, and the maximum deflagration intensity occurred at a fuel ratio of 0.6.