Research progress on hypergolic ionic liquid propellant with short ignition delay time
Hypergolic liquid propellant can not only simplify the design of liquid rocket engine,but also realize multiple trouble-free ignitions and improve the operation safety of launch vehicles,which is one of the research focuses in the field of aerospace propulsion technology.Reducing the ignition delay time of hypergolic propellant can not only improve the reliability of start-up process of engine and the combustion effiiciency of propellant,but also avoid the accumulation of propellant in the combustion chamber,which will cause excessive pressure peak or trigger violent oscillation combustion and explosion.Due to the advantages of low vapor pressure,adjustable physicochemical properties and low toxicity,hypergolic ionic liquids(HILs)are expected to compensate or replace hydrazine as the fuel of liquid propellant.Based on the combustion performance of ignition delay time less than 5 ms,the synthesis and preparation methods of HILs and compounded system are reviewed.According to the requirements of hypergolic combustion propulsion system,although the existing HILs or compounded system with short ignition delay have the potential to become the future green hypergolic propellant fuel,there are some constraint problems such as high viscosity,complex combustion products and low specific impulse.Therefore,in order to accelerate the application of HILs or compounded system in engineering,it is necessary to carry out theoretical and experimental research on the aspects of performance improvement,engineering applicability,system matching,etc..
liquid propellanthypergolic ionic liquidignition delay timeorganic synthesiscompounded system
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