| Abstract: |
In part I of this series of papers, we presented an evaluation strategy that can be applied to surrogate mixtures for finished fuels. This strategy uses the advanced distillation curve approach to evaluate the surrogate in terms of physicochemical authenticity, or how well the surrogate represents the chemical and physical properties of the finished fuel. While this protocol can be applied to any surrogate family, of particular interest here are surrogates for Jet-A/JP-8. The volatility was studied in Part I, whereas here we focus on density, speed of sound, and visocosity. We calculated these properties for the common Jet-A/JP-8 surrogates and for Jet-A, with the NIST Refprop program (equations of state and transport model). We then used Refprop as a surrogate mixture design tool, and developed a simple, three component surrogate mixture (n-dodecane, n-tetradecane, 1,2,4-trimethylbenzene with mass fractions of 0.31, 0.38, 0.31, respectively). This mixture was subsequently formulated in the laboratory and measured with the advanced distillation curve approach. We found the agreement with theory to be excellent (within 1.5 C), and we also found that the abiliyt of such a simple mixture to represent Jet-A/JP-8 was also excellent. |
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