Heat of reaction at the burning surface

Fig. 7.12 Heats of reaction at the burning surface (Qj) and in the gas phase at the interface between zone I and zone II Qjj.

Substituting the and data into Eqs. (3.75) and (3.76), the temperature sensitivity of the gas phase, O, as defined in Eq. (3.79), and of the solid phase, as defined in Eq. (3.80), are determined as 0.0028 and 0.0110 respectively W is approximately four times greater than O. The computed Op represented by the sum of O and W is therefore 0.014 which is approximately equal to the Op derived from burning rate experiments. The heat of reaction at the burning surface is the dominant factor on the temperature sensitivity of the burning rate of the BAMO copolymer. 

Since the burning surface becomes highly heterogeneous with increasing hmx the determination of values is no longer possible, which precludes the determination of the heat of reaction at the burning surface, Q. However, it is assumed that the decomposition of the HMX particles within the base matrix occurs relatively independently of the decomposition of the base matrix, i. e., the double-base propellant. The overall heat release at the burning surface of an HMX-CMDB propellant is thus represented by[i]... 

The temperature sensitivity of gas phase 4> defined in Eq. (3.79) and the temperature sensitivity of the condensed phase V defined in Eq. (3.80) are obtained from the data of the burning surface temperature Ts, the temperature in the fizz zone Tg, the activation energy in the fizz zone Eg, the heat of reaction at the burning surface Qj, the temperature gradient in the fizz zone (f>, and the burning rate r. Figure 7-43 shows the temperature sensitivity of the burning rate of HMX-CMDB propellants as... 

Fig. 5.25 Temperature gradient, conductive heat flux, convective heat flux, and heat flux by chemical reaction as a function of distance from the burning surface at 3 MPa (initial temperatures 243 K and 343 K) for BAMO/ THF = 60 40 copolymer.

Fig. 7.45 shows a set of flame photographs of HMX-GAP propellants with and without catalysts. The luminous flame front of the non-catalyzed propellant is almost attached the burning surface at 0.5 MPa (a). When the propellant is catalyzed, the luminous flame is distended from the burning surface at the same pressure (b). Since the heat flux transferred back from the gas phase and the heat of reaction at... 

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