Self-Ignition of Hydrogenous Mixtures with Hydrocarbon Fuel Additives

8 Self-Ignition of Hydrogenous Mixtures with Hydrocarbon Fuel Additives 

At 2-3 MPa pressure the corresponding dependencies are predicted to cross each other. The known comparison between the hydrogen and methane delay times are based on data obtained at 0.1 MPa pressure, at which hydrogen ignition occurs much faster [26]. 

The data on methane -I- hydrogen -t- oxygen self-ignition in [26] have no hint of the scenario illustrated in Fig. 6.18. Therefore, it can be assumed that self-ignition characteristics of hythane-like mixtures at practicable conditions have been not investigated. The empirical dependencies from [26] are inapplicable to real life 

9 Self-Ignition of Heterogeneous Hydrogenous Combustible Mixtures 

The weak effect of hydrogen additives on liquid kerosene atomized in oxygen has been proved by direct measurements [73]. The data from those measurements are summarized in Fig. 6.20. The value bands 1,2, 3 denote the atomized propellant RG self-ignition in shock-compressed oxygen at various pressure levels. Curve 4 denotes the spray C10H22 self-ignition. Curves 5 and 6 and band 7 were obtained in experiments with 7.5% H2 + 92.5% O2 and 15% H2 + 85% O2 mixtures. Curves 8,9 are calculated data for 7.5% H2 + 92.5% O2 mixture at 1 MPa and 4 MPa pressures respectively. 

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