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Studies on the Ballistic Parameters of a Deterred Triple Base Propellant Used in Large Caliber Ammunition

Dahiwale Sunil M., Bhongale Chetan J., Roy Shubhankar, Navle Pradeep B., Asthana Shrinandan N.

Central European Journal of Energetic Materials

2019

Vol. 16, no. 3

449--467

In this work, the energetic plasticizer N-n-butyl-N-(2-nitroxyethyl)nitramine (Bu-NENA) was used as a deterrent coating for a triple base propellant (TBP) that finds application in large caliber guns. Closed vessel (CV) evaluation was performed to study the ballistic performance of the deterred propellant. A TBP containing nitrocellulose (NC), nitroglycerine (NG) and nitroguanidine (NQ) was coated with an energetic plasticizer using a solution of Bu-NENA. The Bu-NENA coated propellant exhibited inhibition to burning resulting in a reduction in the values of the ballistic parameters viz. (dP/dt)max, burning rate coefficient (β) and relative vivacity (RV), while the pressure index (α) and rise time were increased. The trends obtained during this work display the potential of Bu-NENA as deterrent.

Local Temperature Sensitivity Coefficients of a Deterred Spherical Single Base Gun Propellant

Boulkadid K., Lefebvre M. H., Jeunieau L., Dejeaifve A.

Central European Journal of Energetic Materials

2017

Vol. 14, no. 4

952--965

In our previous investigation, we measured the global temperature sensitivity coefficient of a deterred spherical single base gun propellant following an experimental procedure that did not allows us to determine the local temperature sensitivity coefficients of the deterred and undeterred parts of the investigated propellant. In this paper, we propose an experimental methodology to measure the local temperature sensitivity coefficients of both parts of the spherical deterred gun propellant. This methodology can be summarized as follows: Firstly, we separated the ranges of pressure where the combustion of the deterred and the undeterred parts of the spherical propellant occurs by means of infrared (IR) microscopy measurements. Then the burning rate of the propellant as a function of pressure was calculated according to STANAG 4115 at different initial temperatures. Finally, we determined the local temperature sensitivity coefficients of each part of the spherical propellant.

Characterization of Deterred Propellants by Closed Vessel Tests: Importance of the Ignition Method

Jeunieau L., Lefebvre M. H., Pirlot M. C., Guillaume P.

Central European Journal of Energetic Materials

2005

Vol. 2, nr 3

39-53

Different gaseous ignition systems have been used for the characterization of spherical deterred propellants in closed vessel tests. It has been observed that, with an appropriate ignition system, a good correlation is obtained between closed vessel tests, deterrent concentration profiles and ballistic firing.