Abstract
Closed vessel test (CVT) is widely used for the measurement and comparison of ballistic and energetic properties of propellants by the ignition of a specific sample mass in a closed high-pressure vessel. In our research, comparative CVTs were performed in a vessel, where an internationally accepted composite propellant base bleed grain sample served as a reference (Ref) for recording the standard values of the under investigation propellant composition, in relation to which newly developed samples were characterized. These comparative CVT experiments were performed under chamber volume of 100cm3, sample mass of 10g for all samples and identical ignition system having 1.5g igniter bag of gunpowder. We used closed vessel with working pressure limit of 5000 bars for recording the ballistic parameters of various composite solid propellant samples with reference to a standard sample. It was found that the Ref sample at 50% propellant loading recorded mean maximum pressure (Pm) of 1040 bars in complete combustion time (tPm) of 120ms and vivacity of 0.038 (1/bar∙s). The measured mean Pm was taken as relative force (%) and measured mean vivacity was taken as relative vivacity (%). This data has been used to tune and study the ballistic parameters to develop Ammonium perchlorate (AP) and hydroxyl-terminated polybutadiene (HTPB) based composite solid propellant (CSP) base bleed grain for artillery projectile.
Highlights
Closed vessel test (CVT) of gun propellants is a technique employed for the experimental evaluation of propellant ballistic parameters at laboratory level [1, 2]
CVT experiments were performed with 10g of sample mass for each sample which is the 50% of loading charge capacity of the vessel
Five rounds were test fired for reference and each batch of Ammonium perchlorate (AP)/hydroxyl-terminated polybutadiene (HTPB) composite solid propellant (CSP) under identical conditions and results were averaged
Summary
Closed vessel test (CVT) of gun propellants is a technique employed for the experimental evaluation of propellant ballistic parameters at laboratory level [1, 2]. Dynamic firing for testing any propellant is an expensive method so the closed vessel (CV) provides a very safe, quick and economical way for research and development of propellants [4,5,6]. Recorded P-t data are used to calculate the ballistic parameters including differential pressure (dP/dt), relative force and relative vivacity (quickness) of the propellant [7]. We used for the first time CV firing to record the ballistic parameters of various CSP samples with reference to a standard sample for BB unit of 155mm artillery projectile. CVT was performed by firing three rounds of each sample and the mean values were recorded to study the tuning of ballistic parameters during the development process of BB propellant grain according to the Ref sample
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