A Novel Interior Ballistic Prediction of Gun Propellants Based on Experimental Pressure-Apparent Burning Rate Model in Closed Vessel

Abstract

A new experimental pressure-apparent burning rate model was established based on the recorded pressure-time data in the closed vessel to study the actual burning gas generate rate of a propellant whose form function is not available. The new burning model can replace the Vieille’s law and form function of propellants in the interior ballistic equations to predict the interior ballistic performance of gun. As distinct from the traditional geometric form function based burning rate model, the new model introduced the concept of relative pressure impulse related to the actual burnt web thickness of propellant statistically. The apparent burning rate was expressed by the propellant mass fraction burnt vs. relative pressure impulse curve. The interior ballistic simulation of selected gun propellants was conducted using the new burning rate model. The results predicted by the new model show a good agreement with the classic interior ballistic predication results though the agreement with the experimental results is still to be improved.

Effects of an Organic‐inorganic Nanocomposite Additive on the Combustion and Erosion Performance of High Energy Propellants Containing RDX

“…Each sleeve was cleaned by ethanol and acetone repeatedly, then dried at 110 8C for 30 min. The closed bomb burning tests of modified propellants were performed using a 100 cm 3 vessel, which is similar to a previously reported device [14]. To determine the force constant of propellant, each sample was tested for three times with the loading density of 0.12 g/cm 3 and 0.2 g/cm 3 , respectively.…”

“…, it can be found that abundant asperities are arranged on the microsphere surface. According to our previous study [14], they are nanoparticles deriving from the recipe. Figure 2(c) illustrates that the particle size distribution of the nanocomposites is in the range of 4-40 mm with an average value of 11.9 mm, which is well-indexed to the SEM results.…”

“…L and B were defined as the following two equations [14]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 where p m and p(t) are the maximum pressure and the pressure at some time in the closed vessel experiment, respectively.…”

Utilization of Micro X-Ray Computed Tomography for the Quality Assurance of Gun Propellants

“…To determine the overall fraction of a propellant burnt(∅) the web fraction is utilized as well as a shape function( ) which takes into account the complex geometries of various grains. Recently a novel approach was developed to predict burn rates in gun propellants without the use of shape functions (Xiao et al, 2015) but the traditional calculation outlined in Equation (1) is still utilized in the majority of internal ballistic calculations (Kulkarni and Maik, 2000):…”