Investigations of the Influence of Ignition on the Dynamic Vivacity of Propellants

Trȩbiński, R.; Leciejewski, Zbigniew; Surma, Zbigniew

doi:10.5604/01.3001.0012.9670

Cited by 6 publications

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“…As shown in [32], ignition by gunpowder takes place at a pressure value that is much lower than the nominal ignition pressure; Figure 1 shows the pressure courses that illustrate this fact. If burning of a tested propellant was initiated after full combustion of the gunpowder igniter, pressure courses up to the nominal value of ignition pressure would coincide.…”

Section: Resultsmentioning

confidence: 95%

Analysis of Application of Plasma Ignition in Closed Vessel Tests

et al. 2021

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This paper presents the results of a comparative investigation into the effects of the ignition method on the ballistic properties of three types of propellants: a single-base propellant, a double-base propellant and a low vulnerability (LOVA) propellant, as determined via closed vessel tests (CVT). Conventional gunpowder ignition and plasma jet ignition methods were used. The influence of the ignition method on the values of the propellant characteristics obtained in CVT was analysed. It was found that the method of ignition has an influence on the values of propellant characteristics, determined in CVT. An analysis of the experimental form functions showed that plasma ignition is not a solution to the problems inherent to the process of determining the ballistic properties of propellants in which the burning process deviates from the geometric burning law.

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Section: Resultsmentioning

confidence: 95%

Analysis of Application of Plasma Ignition in Closed Vessel Tests

et al. 2021

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“…Unfortunately, we did not find any such results. The only exception is the study by [15], in which the results for black powder were analyzed. The shapes of its grains are shown in Figure 14.…”

Section: Resultsmentioning

confidence: 99%

“…The lower limit of the z range z 0 is chosen in such a way that the part of the G(z) curve that corresponds to the initial transient process, when the tested propellant burns parallel with the igniter, is eliminated. As shown in [15], burning of the tested propellant begins before attaining the ignition pressure, and burning of the igniter ends at pressure values higher than the ignition pressure. At low values of pressure, the igniter burns considerably faster than the tested propellant.…”

Section: Methodsmentioning

confidence: 96%

“…This means that a larger value of the energy of the igniter is necessary to ignite a propellant charge composed of fine grains. As shown in [14,15], increasing the mass of the igniter is not a solution, because it prolongs the time of parallel burning of the igniter and the propellant. Moreover, in ammunition, the correlation between the igniter mass and propellant mass is even lower than that applied in CVT.…”

Section: Introductionmentioning

confidence: 99%

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Determining the Burning Rate of Fine-Grained Propellants in Closed Vessel Tests

2022

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This paper presents the method of determining the burning rate of fine-grained propellants based on the results of closed vessel tests. It is shown that in the case of fine-grained propellants, the standard methods of determining the burning rate fail. There are two reasons for this: imperfections of the grain shapes and the prolonged process of ignition due to a more developed surface than that of coarse grains at the same mass of the propellant. The value of the exponent in the burning law is estimated by the use of the so-called experimental form–function. The upper and lower limits of the value of the coefficient in the burning law are estimated. The accuracy of the proposed method is analyzed. Its validity is assessed by comparing the results of closed vessel tests analysis with accessible literature data.

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“…The second possible dependence is derived from the emission function Γ [1]. According to [4][5][6], the function Γ is defined by the same relation as the dynamic vivacity function L:…”

Section: Fig 1 Real Possible Shapes Of Tubular Powder Grain [2]mentioning

confidence: 99%

Improvement of Barrel Weapons Interior Ballistic Model Using Dynamic Vivacity Function

Schmidt

Beer²,

Konečný³

2021

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The paper discusses a possibility of application of dynamic vivacity function in interior ballistic process mathematical model. At present time, various technologies of powder grain surfacing are applied, mainly in case of powder grains used in assemblies of small-calibre cartridges. The grain surfacing can desirably influence the interior ballistic action. It can further change basic powder thermodynamic properties, and particularly, it can change the character of the powder grain burning, which cannot be described by geometric burning concept. According to the established standards, a necessity of the dynamic vivacity function L evaluation is determined for artillery powders only, but the way of its evaluation can be applied for arbitrary powder grains. The application of the dynamic vivacity function then allows to get results of solution of the interior ballistic tasks with higher accuracy, as well as the selection of suitable grain surfacing technology.

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Investigations of the Influence of Ignition on the Dynamic Vivacity of Propellants

Cited by 6 publications

References 0 publications

Analysis of Application of Plasma Ignition in Closed Vessel Tests

Analysis of Application of Plasma Ignition in Closed Vessel Tests

Determining the Burning Rate of Fine-Grained Propellants in Closed Vessel Tests

Improvement of Barrel Weapons Interior Ballistic Model Using Dynamic Vivacity Function

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