Viscosity Measurements of Potential High Density Hydrocarbon Fuel Blends.
Final rept. Dec 73-Dec 74,
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO
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The principle problems associated with the use of RJ-5 Shelldyne-H as a missile fuel is its high viscosity, particularly at 0 F and below. Chemically, this material can be described as the hydrogenated dimer of norbornadiene HNBD. Using the Model 17 Weissenberg Rheogoniometer, the viscosity of pure RJ-5 and blends of RJ-5 and other hydrocarbons was determined over a temperature range from -65 F to 70 F. The hydrocarbons evaluated as viscosity improvers when added to Shelldyne-H include toluene, JP-4, methylcyclohexane, tetralin, decalin, RJ-4 tetrahydro-methylcyclopentadiene dimer and isobutylbenzene. The concentrations studied were 5, 10, 25, and 35 and 50 weight percent diluent in RJ-5. Toluene blends were found to be the most effective in reducing low viscosity while retaining volumetric heating values at significantly high levels. It is concluded that considerable progress is possible in the high density missile fuel area through the blending of hydrocarbon components. Present high density fuels, such as RJ-5 can be tailored to yield fuels with properties which are more adaptable to suitable system designs for low temperature application and yet have significantly more volumetric energy higher density than conventional hydrocarbon fuels. Author