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    Wyświetlanie 1-3 z 3
    Tytuł:
    An Approximate Model for the Theoretical Prediction of the Velocity Increase in the Intermediate Ballistics Period
    Autorzy:
    Trębiński, R.
    Czyżewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358088.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    intermediate ballistics
    internal ballistics
    projectile velocity
    Opis:
    This paper is a continuation of an earlier work [1] by the authors devoted to CFD modelling of the intermediate ballistics period. A semi-analytical model is proposed based on the analytical solution of the Prandtl-Meyer expansion for an approximate assessment of the magnitude of the velocity increase in the intermediate period. Two variants of the model provide upper and lower estimates of the velocity increase. A comparison of these estimates with the results of CFD modelling gives a similar magnitude for the velocity increase. A formula is proposed for a simple estimation of the velocity increase that can be used to calculate a correction to the muzzle velocity value obtained by internal ballistics models.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 1; 77-88
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the Increase in Projectile Velocity in the Intermediate Ballistics Period
    Autorzy:
    Trębiński, R.
    Czyżewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358596.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    intermediate ballistics
    internal ballistics
    projectile velocity
    Opis:
    The idea of the application of internal ballistics models together with external ballistics models in fire control systems encounters a problem in relating the calculated muzzle velocity value to the initial velocity value used in external ballistics calculations. The difference between these two values is caused by the action on the projectile of the propellant gases exiting from the muzzle. In this paper an attempt has been made to estimate the increase in projectile velocity outside the muzzle by the use of CFD modelling. The commercial ANSYS FLUENT code has been used together with our own 1D model for the internal ballistics period. Calculations have been performed for various launching systems, from small arms to a 155 mm calibre gun. Conclusions have been drawn concerning the magnitude of the increase in projectile velocity outside the muzzle. The main conclusion is that the velocity increase is generally less than 1% and in most cases can be neglected.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 1; 63-76
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Method for Dynamic Pressure and Velocity Measurement Related to a Power Cartridge Using a Velocity Test Rig for Water-Jet Disruptor Applications
    Autorzy:
    Parate, Bhupesh Ambadas
    Salkar, Yogesh Balkrishna
    Chandel, Sunil
    Shekhar, Himanshu
    Powiązania:
    https://bibliotekanauki.pl/articles/357922.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    power cartridge
    data acquisition
    double base propellant
    high speed photography
    projectile velocity
    pressure
    propellant
    projectile
    standard deviation
    water-jet disruptor
    velocity test rig
    Opis:
    Power cartridges are gas generators utilised to drive a liquid projectile for disruption of suspect improvised explosive devices (IED’s). The purpose of a water-jet disruptor is to destroy the suspected IED. A novel method was devised for pressure measurement at the exit of the cartridge for launching liquid projectile. An experimental test set-up was designed and fabricated for measurement of projectile velocity and the propellant gas pressure in a velocity test rig (VTR). In these experiments, double base propellants having different physical and chemical properties were utilised to drive the solid projectile. This projectile was made of nylon material. This projectile velocity measurement is an important parameter in the armament field. An experimental study is the unique design feature. It is responsible for the measurement of pressure at the exit of the cartridge and the projectile velocity at the muzzle end of the barrel. The projectile velocity was measured using high speed photography. The pressure was measured using a pressure sensor. The maximum projectile velocities for spherical ball powder and NGB 051 propellants have been experimentally measured as 384.23 m/s and 418.32 m/s, respectively. Experimentally the maximum pressures for spherical ball powder and NGB 051 propellants have been evaluated as 50.12 MPa and 63 MPa respectively from data gathered by the acquisition system. The standard deviation between the experimental and theoretical values for the projectile velocity varied from 12.57 to 13.88 for spherical ball powder whereas it was 5.33 to 7.09 for NGB 051 propellant. The percentage error between the experimental and the theoretical values of the projectile velocity was less than 10 for both propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 3; 319-342
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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