By V. S. and L. S. Skubachevskii Zuyev
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Additional info for Combustion Chambers for Jet Propulsion Engines
As a result of the system of intermediate reactions I - I V the number of atoms of hydrogen (active centres) increases. However, not all the atoms of hydrogen, formed as a result of reactions I - I V , lead to the formation of the end product ( H 2 0 ) ; as a result of the presence of chain-breaking reactions (absorption of atoms, the reaction H + H = H 2 ), hydrogen atoms are "non-productively" destroyed and do not lead to the formation of H 2 0 . I n order t o determine t h e conditions for t h e development of a chain reaction with branched chains we shall write down the equation for the rate of formation of active centres.
5. Three characteristic regions can be distinguished in the general case. The first region (1) is a slowly developing reaction in which the velocity t See for example, Ya. B. Zel'dovich and V. V. Voyevodskii Thermal Explosion and Flame Propagation in Gases, published by MMI, 1947. The term "explosive" reaction should not be confused with the idea of "explosion", which will be discussed below. 31 32 COMBUSTION CHAMBERS FOR JET PROPULSION ENGINES is very small (unobservable). The quantity of the reaction products is also very insignificant.
4 x 1018 mol/cm3 sec . 001 sec, w Ha0 = 1 A x 105 X 10130 = 1 A X 10135 mol/cm3 sec . Such a value for the velocity is not achieved in reality, since the final assumptions made concerning the extent of branching of the reaction are incorrect. In fact, it is impossible even to neglect the "termination" 28 COMBUSTION CHAMBERS FOR JET PROPULSION ENGINES reaction H -f H = H2, which, according to the extent of increase in the number of active centres, will have a great influence on the velocity of the reaction.