Pressure and Temperature Effect on Hydrogenous Mixture Self-Ignition

3 Pressure and Temperature Effect on Hydrogenous Mixture Self-Ignition 

The practice of using hydrogen as a fuel in RJE, LPE, ICE has revealed some characteristic features incompatible, at the first glance, with the apparent high hydrogen reactivity. The increased combustion stability of H2 + O2 mixtures in CC and GG of LPE, compared with kerosene -1- O2 mixture combustion stability, has not been explained. Difficulties encountered in managing the steady combustion of H2 + O2 mixtures in RJE at 0.5-1.0 MPa and T 1,000 K are still not understood. Attempts to describe the reaction zone structure of the detonation, on the basis of many empirical relations for H2 + air mixture self-ignition delay, have been unsuccessful. 

Here P02 is the oxygen partial pressure in the mixture. More precise data obtained in [17] force us to take into account the more general relation 

The correction multiplier in the square brackets contains a term depending on temperature and pressure and specified by the relationship of two chemical reactions constants - K2 and K.  

Here K2 is the chain branching velocity constant of the reaction 

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