Water Steam Effect on Self-Ignition

The water steam effect on H2 + air mixture self-ignition has been analyzed using calculations with up-dated kinetic schemes and is illustrated by the diagrams in Fig. 6.32 (1,000-1,200 K temperature) [7]. The increase in self-ignition delay time Tr2o, for mixtures with water steam, compared to t, for a dry mixture, at several temperature levels, is presented in Fig. 6.33 as a function of the initial pressure. 

The temperature dependence of t, in Fig. 6.35 proves the weak pressure effect on the self-ignition delay at temperatures exceeding 1100 K. For practical assessment of the water steam effect on H2 + air self-ignition within the temperature range 950-1100 K, it is advisable to use the kinetic scheme from [93]. 

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