Characteristics of Pyrolants

The energetic materials used as propellants, explosives, and pyrolants have distinct physicochemical properties. The burning pressure in the relevant combustion chamber ranges from 0.1 MPa to 20 MPa for rockets and from 10 MPa to 5000 MPa 

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Fig. 11.4 Burning rate characteristics of Mg-Tf pyrolants as a function of adiabatic flame temperature.

Kuwahara, T., Matsuo, S., and Shinozaki, N Combustion and Sensitivity Characteristics of Mg/Tf Pyrolants, Propellants, Explosives, Pyrotechnics, 22,198-202,... 

The smoke characteristics of three types of pyrolants, namely nitropolymer pyrolants composed of NC-NG with and without a nickel catalyst, and a B-KNO3 pyrolant, have been examined in relation to the use of these pyrolants as igniters of rocket motors. Though nitropolymer pyrolants are fundamentally smokeless in nature, a large amount of black smoke is formed when they burn at low pressures below about 4 MPa due to incomplete combustion. Metallic nickel or organonickel compounds are known to catalyze the gas-phase reaction of nitropolymer pyrolants. 

Fig. 12.2 Burning rate characteristics of BK and NP pyrolants, showing that the burning rate of the NP pyrolant remains unchanged by the addition of nickel particles.

Burning Rate Characteristics of Cas-Cenerating Pyrolants 15.5.2.1 Burning Rate and Pressure Exponent... 

Fig. 15.6 shows the burning rate characteristics of A P, N P, and GAP pyrolants in a gas generator. The burning rate of the GAP pyrolant is seen to be much higher than... 

The specific impulse of each pyrolant is computed as a function of air-to-fuel ratio, as shown in Fig. 15.7. In the computations, the pressure in the ramburner is assumed to be 0.6 MPa at Mach number 2.0for a sea-level flight When GAP pyrolant is used as a gas-generating pyrolant, the specific impulse is approximately 800 s at e = 10. It is evident that AP pyrolant and NP pyrolant are not favorable for use as gas-generating pyrolants in VFDR. However, the specific impulse and burning rate characteristics of these pyrolants are further improved by the addition of energetic materials and burning rate modifiers. 

Fig. 15.16 shows the characteristics of the gas-generating pyrolant and the pressure in the gas generator. The throat area of the gas generator, Aj, is changed by displacement of the pintle. 

Fig. 15.12 shows the burning rate characteristics of an AP composite pyrolant containing boron particles. The pyrolant is composed of j p(0A0),... 

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