Energetics of the Gas Phase and Burning Rate

Since the energy density of double-base propellants is directly correlated with (N02), the burning rates shown in Fig. 6.6 have been plotted as a function of (N02) at different pressures.As shown in Fig. 6.7, the burning rate increases 

Since the final gas-phase reaction to produce a luminous flame zone is initiated by the reaction in the dark zone, the reaction time is determined by the dark zone length, L, i. e., the flame stand-off distance. Fig. 6.8 and 6.9 show data for the dark zone length and the dark zone temperature, T, respectively, for the propellants listed in Table 6.3. The luminous flame front approaches the burning surface and 

The reaction time to produce the luminous flame, x is given by 

The rate of temperature increase in the fizz zone, (dTldt)f s, indicates the heating rate due to the exothermic reaction in the fizz zone. As shown in Fig. 6.12, the heating rate increases linearly in a plot of In versus (N02) at 2.0 MPa. The re- 

The heat flitx feedback from the fizz zone to the burning surface, (kgdTldx)f s, can also be computed from the temperature data in the fizz zone. Fig. 6.13 shows (kgdT/ dx)fs (kW m ) as a function of (N02) at 2.0 MPa, as represented by 

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