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

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

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Thus, the velocity of the chain-breaking reaction is, in practice, very small, depending on the temperature, since the energy of activation in the reaction for destruction of active centres is extremely small (such reactions proceed without rupture of intramolecular bonds). At the same time, the velocity of the chain-branching reaction depends, on the contrary, very strongly on the temperature because it has a sufficiently large value for the energy of activation. In our example, the reaction determining the velocity of the chain branching reaction has E = 18,000 kcal/mole.

23. Determination of the flame length for an ignition source located on the periphery of the gas stream. We lay off the coordinate axes such t h a t the zero of the abscissa is in t h e plane of the ignition source and t h a t of the ordinate axis along the axis of the jet. I t is clear t h a t for a n y elementary section of the front the following dZ = t a n (p, resulting directly from Mikhel'son's relationship is t r u e : dr Law, where (p is the angle between the direction of the flow velocity and the normal to the flame front.

QremI FIG. 10. Variation with temperature of the quantity of heat lost from systems with different amounts of surface cooling. Moreover, the heat removal curve can be displaced with constant slope to left or right, depending upon the value of T0 (Fig. 11). 40 COMBUSTION CHAMBERS FOB, JET PROPULSION ENGINES Supply of heat to the reacting substances is brought about because of chemical reaction. FIG. 11. Effect of magnitude of initial temperature T0 on the position of the heat removal curve. If q is the heat released by the combustion of one molecule, then #supp =qw = q const, fr e~ EIRT n^ .

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