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  • 1
    Online Resource
    Online Resource
    A study of the ignition and combustion of high-density charges under constant volume conditions
    Tomsk State University ; 2023
    In:  Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika , No. 81 ( 2023), p. 123-132
    Details
    In: Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, Tomsk State University, , No. 81 ( 2023), p. 123-132
    Abstract: The study of combustion and ignition of charges with promising propellants or powder compositions in terms of initial conditions is an urgent problem of modern ballistics. Generally, combustion and ignition of charges are tested in a manometric closed vessel. The charge ignition conditions may affect the subsequent reactions. When designing a shot with a new charge, it is necessary to know what determines the moment of ignition (gas pressure, time, pressure rise rate, type of igniter, etc.) and which factor has a greater effect on the ignition. This paper presents a study of some features of high-density charge ignition under constant volume conditions. A brief description of the manometric setup is given. The effect of mass and type of igniter and combustion surface area on the high-density charge ignition and subsequent combustion is studied. The pressure-time dependences corresponding to high-density charge combustion in a textolite container with different diameters are presented and analyzed. The ignition of the paste high-density charge is revealed to be affected by the geometric dimensions of the container. The parametric experimental study results show that the ignition conditions of a model high-density propellant (MHDP) strongly depend on the method of initiation, namely the number of burning particles and ambient pressure; however, these factors do not affect the dependence of the MHDP combustion rate on pressure. The ignition momentum is obtained as a function of the ratio of the container burning surface circumference to the burning surface area.
    Type of Medium: Online Resource
    ISSN: 1998-8621 , 2311-2255
    Uniform Title: Исследование особенностей зажигания и горения высокоплотных зарядов в условиях постоянного объема
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17223/19988621/81
    DOI: 10.17223/19988621
    DOI: 10.17223/19988621/81/11
    Language: Unknown
    Publisher: Tomsk State University
    Publication Date: 2023
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    STUDY OF THE PASTE-LIKE PROPELLANT COMBUSTION AT VARIOUS LOADING SCHEMES
    Tomsk State University ; 2020
    In:  Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika , No. 67 ( 2020), p. 89-101
    Details
    In: Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, Tomsk State University, , No. 67 ( 2020), p. 89-101
    Abstract: The experimental and theoretical studies of the paste-like propellant combustion in a model ballistic installation are implemented. The research is carried out using three masses of projectile assemblies and three types of the propellant charge. The paper presents two versions of the law of dispersion for paste-like propellants which allow accounting for the pressure on the front and acceleration of the projectile assembly with a traveling charge. The coefficients in the laws of dispersion are obtained. Using the mathematical model presented in this work, the gas-dynamic pictures of the shots when the propellants are applied as traveling charges are obtained for each dispersion law. Based on the results, a detailed study of the processes occurring with the traveling charge consisting of a model paste-like propellant is implemented for various shot arrangements. The discrepancy between theoretical results and the results obtained in the set of experiments is no more than 2% for the maximum pressure and no more than 1% for the muzzle velocity. The dispersion law accounting for the projectile assembly acceleration and traveling charge makes it possible to describe accurately the processes in the space behind the projectile for projectile assemblies of various masses and different types of granulated powder charge in terms of the model ballistic installation in the considered pressure range.
    Type of Medium: Online Resource
    ISSN: 1998-8621 , 2311-2255
    Uniform Title: ИССЛЕДОВАНИЕ ГОРЕНИЯ ПАСТООБРАЗНОГО ТОПЛИВА ПРИ РАЗЛИЧНЫХ СХЕМАХ ЗАРЯЖАНИЯ
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17223/19988621/67
    DOI: 10.17223/19988621
    DOI: 10.17223/19988621/67/9
    Language: Unknown
    Publisher: Tomsk State University
    Publication Date: 2020
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Simulation of the interaction of conical impactors having an angle of attack with underwater barriers
    Tomsk State University ; 2023
    In:  Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika , No. 80 ( 2023), p. 39-48
    Details
    In: Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, Tomsk State University, , No. 80 ( 2023), p. 39-48
    Abstract: In this paper, the effect of the angle of impact and the angle of attack on the interaction between truncated coneshaped impactors made of BHZh-95 alloy and underwater barriers made of aluminum alloy is studied using experimental and computational methods. When such an impactor enters water, a supercavern appears around the impactor and minimizes the fluid friction. During the motion, the impactor afterbody periodically experiences impermanent contact with the walls of the supercavern, which maintains the steady motion. Note that the center of mass of the impactor is located closer to its afterbody, which can induce the angle of attack appearance during the motion. The experimental study is conducted using a hydroballistic track with high-speed video recording. The speed range of 250-350 m/s is considered. Mathematical modeling is carried out using the EFES original software package. It is revealed that a positive angle of attack β ≤ 10° leads to the normalization of the impactor and a decrease in the effective thickness of the barrier with its perforation. In contrast, at a negative angle of attack, the impactor rebounds from the barrier.
    Type of Medium: Online Resource
    ISSN: 1998-8621 , 2311-2255
    Uniform Title: Моделирование взаимодействия конических ударников с подводными преградами при наличии у ударников угла атаки
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17223/19988621/80
    DOI: 10.17223/19988621
    DOI: 10.17223/19988621/80/4
    Language: Unknown
    Publisher: Tomsk State University
    Publication Date: 2023
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Underwater launching of a supercavitating projectile out of a ballistic test setup
    Tomsk State University ; 2023
    In:  Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika , No. 82 ( 2023), p. 97-107
    Details
    In: Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, Tomsk State University, , No. 82 ( 2023), p. 97-107
    Abstract: This paper considers the investigation of the high-speed motion of specifically-shaped inert bodies (projectiles) in water. The main purpose is to determine the peculiar properties of underwater launching of supercavitating projectiles out of the bore of a test ballistic setup. Preliminary calculations of the inner ballistic parameters of a shot are per-formed for the given launcher and then compared with the corresponding experimental data. Examples of experimentally fired underwater shots are presented. The high-speed high-energy processes associated with the projectile released out of the bore and entering water are described. It is shown that during the underwater launching, the complex gas-dynamic conditions of multi-phase processes following the projectile release out of the bore can significantly affect the trajectory of its further motion in water. Using the experi-mental and calculation methods with the classical loading scheme and an acceleration bore 0.5 mm long or less under given conditions, it has been determined that the pressure at the accelerator exit increases stepwise and can significantly change the flow conditions of the projectile at the start and its further trajectory. Taking into consideration the revealed peculiarities of underwater shots and a set of technical specifications and mass-size parameters, a perspective launching ballistic setup has been designed and used to estimate the motion range of the released supercavitating projectile.
    Type of Medium: Online Resource
    ISSN: 1998-8621 , 2311-2255
    Uniform Title: Подводный старт суперкавитирующего ударника из лабораторной баллистической установки
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17223/19988621/82
    DOI: 10.17223/19988621
    DOI: 10.17223/19988621/82/8
    Language: Unknown
    Publisher: Tomsk State University
    Publication Date: 2023
    Location Call Number Limitation Availability
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    Online Resource
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