The Sensitivity of Double Base Propellant Burning Rate to Initial Temperature
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The Parr-Crawford, overlapping zone, model of double base propellant combustion, has been programmed for the fizz burning process. Burning rate, surface temperature, and maximum fizz zone temperature are measured at nominal range conditions 1 atm, 293 K for a given propellant and used in the model to determine the pre-exponential factors in the two Arrhenius reaction rate equations. The values of these two factors are then held constant as initial temperature and pressure are varied. From these solutions, points on the curves of constant initial temperature To are plotted on a graph of the log burning rate r vs log pressure p. From these graphs it can be observed from the slope and spacing of the lines whether a burning rate law of the form r Co expoTopn can be used to systematize the model solutions i.e., if the lines are straight and the vertical distance between lines is proportional to the difference in initial temperature, the n and o can be given constant values. In this equation, n is the burning rate exponent and is equal to the slope of the lines. If all the initial temperature dependence is concentrated in the exponential term, then o can be defined as the initial temperature sensitivity of the burning rate. Co then depends only on propellant composition.
- Rocket Propellants