دانلود کتاب Experimental study of possibilities for employment of linear form of burning rate law to characterise the burning process of fine-grained propellants

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Central European Journal of Energetic Materials, 2008, 5(1), 45-61 pp.In the paper the linear form of burning rate law r=r1p, describing changes (in proportion to pressure p) in burning rate of propellants is reviewed. The linear form is one of many (but very popular) forms of burning rate law predicted to analysis and computer simulations of propellant gun systems operating and design process of gun. Coefficient r1 of the linear form is usually calculated on the basis of average dimensions of grain (layer of burnt propellant) and integrated experimental pressure-time curve. Recorded picture of pressure of propellant gas mixture is an effect of closed vessel test. It is assumed that value of coefficient r1 is constant (for given type of propellant) regardless of value of propellant gas pressure. Different fine-grained propellants (single-base and double-base) were fired in closed vessel tests to determine their burning rate behaviour. The variations in mass of igniter pad (black powder) at the same value of loading density were used. The results of experimental tests and calculations presented in this paper show significant influence of the used type of ignition system (mass of black powder) on burning rate (coefficient r1) of propellant. The differences in calculations of propellant burning rate and computer simulations of pressure-travel history inside the barrel of a propellant gun system indicate that there are limitations to the validity of the linear form approach particularly for fine-grained propellants.