Deflagration evolution characteristic and chemical reaction kinetic mechanism of JP-10/DEE mixed fuel in a large-scale tube. (15th August 2022)

• Record Type: Journal Article
• Authors: Jing, Qi; Wang, Dan; Liu, Qingming; Liu, Changqi; Wang, Zhisong; He, Zongling; Yang, Zhou
• Is Part Of: Fuel. Volume 322(2022)
• Publication Date: 2022-08-15
• Subjects: Flame acceleration -- Mixed fuel -- Secondary flame -- Incomplete combustion -- Sensitivity analysis; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.124238
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The JP-10/DEE mixed fuel is more easily ignited with the increase of fuel ratio. The JP-10/DEE mixed fuel explosion has a synergistic enhancement effect. Flame acceleration is more severe during the secondary acceleration. A secondary flame phenomenon is found as JP-10 slowly evaporates and ignites. The increase of fuel ratio is beneficial to reduce the emission of unstable products. 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.