Combustion Mechanisms of Very High Burn Rate (VHBR) Propellant. Phase II.

Barnes, James T.; Fisher, E B

doi:10.21236/ada299478

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The effective coating can contribute towards efficient quenching of the hot spots because of the formation of the molten layer around RDX particles. As regards ballistics, both the compositions gave higher force constants (1090 J/g and 1091 J/g-theoretical and 1109 J/g and 1095 J/g-experimental) at pressure exponent value < 1 at a flame temperature of 10 . They have opined that when the propellant has superior mechanical properties, the flame propagation occurs by rather relatively slow laminar mechanism.…”

Section: Resultsmentioning

confidence: 91%

Feasibility Study of Processing Estane-based LOVA Gun Propellant

Shaikh¹,

Sanghavi²,

Shelar³

et al. 2007

DSJ

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Low vulnerability ammunition (LOVA) propellant are currently being developed globally to replace all types of single-base, double-base and triple-base gun propellants, because LOVA propellants possess advantage like low vulnerability without compromising on ballistic properties. The objective of present study is to establish processing of thermoplastic elastomer (TPE); estane-based LOVA gun propellant in cord/heptatubular geometry. Keeping in view various advantages of TPE such as simple processing, greater dimensional stability, lower production losses, superior insensitivity, and mechanical properties of the propellants, estane 5731 (polyurethane-ester-MDI, aromatic polyester) is selected for feasibility study as a binder in LOVA-based gun propellant composition, processed by solvent and semi-solvent methods and compared feasibility of processing as well as their evaluation wrt ballistics, vulnerability, and mechanical properties. The results indicate that gun propellants processed by semi-solvent method and extruded at elevated temperatures exhibit better ballistics, mechanical, and vulnerability properties.

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Section: Resultsmentioning

confidence: 91%

Feasibility Study of Processing Estane-based LOVA Gun Propellant

Shaikh¹,

Sanghavi²,

Shelar³

et al. 2007

DSJ

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show abstract

“…For enhancing the burning rate to a higher level, the gun propellant with porous structures was proposed. Investigations [5][6][7] on the porous propellants reveal that the propellants with porous structures show a vast mass conversion rate, and the burning characteristic of porous propellants depends considerably on the physical microstructures. It is believed that the hot gases generated by burning propellants would penetrate into the porous solid and ignite the matrix around the pore which evolves to spherical burning zones.…”

Section: Introductionmentioning

confidence: 99%

“…Among these porous propellant researches, the very high burning rate (VHBR) propellants [7] which possess apparent burning rates in the range of approximately 1 to 1000 m s À1 show a tremendously high mass conversion rate. The preparation and burning mechanism of the VHBR propellants were investigated in detail by Barnes and Fisher [7]. The convective burning behavior is believed to take place when the porous propellants exhibit an ultra-high mass conversion rate.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of Foamed NC‐Based Propellants

Yang

Ying

2014

Propellants Explo Pyrotec

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Foaming properties of the three NC‐based (nitrocellulose‐based) propellants, namely, single‐base propellant, NG (nitroglycerine) propellant and TEGDN (triethylene glycol dinitrate) propellant were investigated in the batch foaming process by using supercritical CO2 as the physical foaming agent. Burning characteristics of the foamed NC‐based propellants were also investigated in this work. For this study, the CO2 desorption of the three NC‐based propellants were plotted by the gravimetric method. The morphology and burning characteristics of these foamed NC‐based propellants were characterized by scanning electron microscope (SEM) and closed vessel experiment. The test data revealed that the energetic plasticizer has a considerable effect on the pore formation in the NC matrix although it has little effect on the CO2 solubility in the NC‐based propellants. Moreover, the SEM images showed the foaming temperature also plays an important role in the pore parameters of foamed propellants. Furthermore, the data of closed vessel experiment indicated that the burning characteristics of foamed NC‐based propellants largely depend on the pore parameters, and the porous structure of foamed propellants would considerably increase the mass conversion rate.

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“…Combustible cases with high energy content, good heat resistance and low sensitivity of the material properties are needed. Nevertheless, traditional formulations using nitrocellulose (NC) as energetic ingredient are judged to be unsafe due to an increased sensitivity to outer stimulations [10]. Propellants based on polymer bonded nitramines are distinguished from NC-based propellants by low vulnerability [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Because the combustible objects contain large amounts of pores, it is believed that a convective combustion zone ahead of the flame front, resulting from the infiltration of combustion products through pores, is responsible for the in-depth combustion or volumetric combustion phenomena [10]. But, combustible objects, which exhibit such a wide range of chemical composition and inner structure might not be expected to burn following a single combustion mechanism.…”

Section: Introductionmentioning

confidence: 99%

Burning Characteristics of Microcellular Combustible Objects Fabricated by a Confined Foaming Process

Yang

Ying

2014

Propellants Explo Pyrotec

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Microcellular combustible objects for application of combustible case ammunition and caseless ammunition were fabricated by a confined pressure quenching foaming process using supercritical CO2 as foaming agent. The experimental results showed that the force constant (f) of objects obviously increased with an increasing RDX content and that the force constant of formulation with 55 % RDX is comparable to that of traditional felted case. Pressure histories, dp/dt‐t, and dynamic vivacity curves were investigated and compared by closed vessel tests. The influencing factors such as RDX content, expansion ratio, foaming temperature, sample size, and loading density were analysed. The results revealed that RDX content and expansion ratio significantly affected the burning properties, whereas the foaming temperature did not have obvious influence. Moreover, the burning behavior also changed with sample size and loading density.

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Combustion Mechanisms of Very High Burn Rate (VHBR) Propellant. Phase II.

Cited by 4 publications

References 8 publications

Feasibility Study of Processing Estane-based LOVA Gun Propellant

Feasibility Study of Processing Estane-based LOVA Gun Propellant

Preparation and Characteristics of Foamed NC‐Based Propellants

Burning Characteristics of Microcellular Combustible Objects Fabricated by a Confined Foaming Process

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