Download Combustion Chambers for Jet Propulsion Engines by V. S. and L. S. Skubachevskii Zuyev PDF

By V. S. and L. S. Skubachevskii Zuyev

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I t can be seen from the formula t h a t increase in r gives a sharp increase in n, since time enters into the relationship in the form of a power. 22) where a is a numerical coefficient, denoting how m a n y molecules of the end product are formed as a result of the entry of one active centre into the reaction. For our example wK = 2 const. ^T • e~" EIRT n0z nn = / n H , where / = 2 const. ]/T e~ E,RT w0a 5 wHz0 = 2 const. (/~T e " E/KT n0q nK . , the rate of formation of t h e main product and the rate of formation of active centres are determined by one and the same reaction.

In the example given above, the reaction H + 0 2 = OH + 0 is the slowest, for which wK = 2 const fT e~ E'RT n0z nK. 20) where (p = / — q . The velocity wv in view of its smallness, does not as a rule exert a signi­ ficant influence on the development of the chain reaction. Branching reactions and chain-breaking reactions exert the main influence on the formation of active centres. External conditions (temperature and pressure) exert a considerable influence on the rate of branching of the chain as well as on the rate of chain breaking.

Suffice to say t h a t the resident time of particles in the combustion chamber of a gas turbine engine m a y be less t h a n 0*005 - 0*006 sec. I n this time all the preliminary processes (for example, the process of atom- THE MATURE OF THE PROGRESS OF CHEMICAL REACTIONS 33 ization) and in particular the process of combustion should be completed (by completion of combustion is m e a n t t h a t not less t h a n 90-97 per cent of the initial components should have reacted). , "fast" or explosive reactions.

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