Study On The Solubility Of Acetylene In High Density Liquid Fuels

Liquid hydrocarbon high-density fuel,as the cornerstone of the current development of the aerospace industry,is the key to providing power guarantee for various aerospace engines,occupying a very important position in the field of propellant.With the development of aviation industry,the performance of the aircraft(including voyage,speed,and payload,etc.)is increasingly important,and the performance of high-density fuels is just the key factor to ensure the performance of the aircraft.Therefore,the era has put forward higher requirements for the performance of high-density fuels.In the past,chemical synthesis did succeed in producing a series of good-quality fuels,achieving improvements in density and volumetric energy.However,with the increase in density,the freezing point and viscosity of fuels increased dramatically.Because of the difficulties that have arisen in the application,it has been very difficult to use chemical methods to further increase the density and volumetric heating value of the fuel.It is time to look for other ways to improve fuel performance.This paper will draw on the idea of adding energetic particles(metal nanoparticles)to high-density fuels,and try to use flammable gas,acetylene,as an oil-soluble energy storage additive to determine the feasibility of adding acetylene to high-density fuels.The solubility of acetylene in high-density fuels was measured,and the acetylene dissolution effect was improved by physical adsorption,chemical binding,Also theoretical calculations were performed in improving the fuel performance.First,we studied the dissolution of acetylene in pure fuels(JP-10 and QC)and found that the amount of acetylene dissolved was very limited.At 298.15 K and the pressure 100 kPa of acetylene,the mole fraction of acetylene can reach 0.60% and 0.75%.Then utilizing the interaction between triethylamine and acetylene,triethylamine is introduced into the high-density fuel to achieve an initial increase in the solubility of acetylene.Under the same pressure,The JP-10 and QC with 5% mass fraction of triethylamine can dissolve acetylene 1.04% and 2.04% by mole.Finally,the cavity structure in the scrambled cages is used to coat acetylene,further improving the solubility of acetylene.JP-10 and QC containing 5% mass fraction of scrambled cages achieved a dramatic increase in the solubility of acetylene,reaching 2.64% and 6.26%,respectively.Compared to JP-10 and QC,they have increased 4.5 times and 8.6 times.Based on the above acetylene dissolution values,the theoretical calorific value of the high-density fuel was calculated under conditions of acetylene pressure of 298.15 K and 100 kPa,and it was found that due to the disadvantage of triethylamine in density,the difference between gross caloric value is not significant,but the volumetric caloric value has dropped with the increase of triethylamine.The use of scrambled cages,as a solid additive,resulted in a significant increase in both gross caloric value and volume calorific value for both JPSx and QCSx.In particular,JPS5 and QCS5 can achieve a volumetric heating value increase of 0.74 MJ/L and 1.51MJ/L,the promotion reached 2% and 3.5%.This provides a theoretical possibility for flammable gas as an oil-soluble energy storage additive.