Hypergolic ignition characteristics and propulsion performance of imidazolium dicyanamide ionic liquids blended with furfuryl alcohol
Droplet tests were performed to study the hypergolic ignition characteristics of three imidazolium dicyanamide ionic liquids blending with different proportions of furfuryl alcohol.Two high-speed cameras and an infrared camera were used to synchronously obtain macroscopic,microscopic,and infrared images of the fuel hypergolic process.The coalescence and reaction process of droplets and liquid pools beneath the liquid surface was also captured.A typical three-stage hypergolic process was observed in the experiments:spreading and mixing,gas-phase products generation,and occurrence of flame kernel and flame propagation.Ignition delay time was defined to quantitatively characterize the hypergolic reactivity.The results showed that the addition of furfuryl alcohol can effectively reduce the viscosity of the fuel blends,promoting the mixing of fuel and oxidant,accelerating the emergence of high-temperature gas-phase and foggy products.The ignition delay time of the mixed fuel changes non-monotonically with the addition ratio of furfuryl alcohol.The blending ratio with the shortest ignition delay increases with the increase of droplet speed;the propulsion performance of the mixed fuel is less affected by the addition of furfuryl alcohol.This research can be a valuable reference for the development and utilization of hypergolic ionic liquid propellants.
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