Ternary System Water - Hydrogen Peroxide-Jet Propulsion Fuel

8 TERNARY SYSTEM WATER-HYDROGEN PEROXIDE-JET PROPULSION FUEL 

The activity coefficients and the equilibrium gas-phase composition have been calculated by using relationships based on Dalton s law. This also applies to Duhem s equation in the form of Eq. (8.22). For the water HP system this approach is approximately valid at T 520 K. Comparison of activity coefficients and gas-phase composition obtained within the Redlich-Kister approximations and by numerical integration of Eq. (8.22) indicates that the modified approach of Eq. (8.23) agrees well with the solution of Eq. (8.22). With this modification, Eqs. (8.8), (8.9), (8.17), (8.18), and (8.23) provide the explicit and fairly accurate dependencies of activity coefficients on solution composition and temperature. Based on the activity coefficients, gas-phase composition can be readily obtained by using the approximations for the total pressure and Eqs. (8.3) and (8.4). Application of these formulae for estimating activity coefficients and gas-phase concentrations at higher temperatures [T 520 K) should be considered as extrapolation. The accuracy of this extrapolation can be worse as compared to total pressure calculations. 

The approaches for calculating equilibrium gas-phase composition in a two-phase system containing aqueous solution of HP. air, and JPF are also suggested. The further step in evaluating the performance of the dual-fuel, air-breathing PDE [13] is to incorporate chemical kinetics of HP decomposition and JPF oxidation. Preliminary results on simulation of JPF (or HP) liquid drop ignition and combustion in air with HP (or JPF) vapor have been reported [16]. 

Frolov, S.M., and V. Ya. Basevich. 1999. Application of fuel blends for active detonation control in a pulsed detonation engine. AIAA Paper No. 99-34130. 

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