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    Wyświetlanie 1-3 z 3
    Tytuł:
    Development and Study of High Energy Igniter/Booster Pyrotechnic Compositions for Impulse Cartridges
    Autorzy:
    Khan, A.
    Malik, A. Q.
    Lodhi, Z. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/358209.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    calorific value
    max no fire current
    stray voltage
    static discharge
    peak pressure
    Opis:
    In order to suitably initiate an impulse cartridge and to get the desired peak pressure, high energy igniter and booster pyrotechnic compositions may be required. Studies were undertaken to develop different types of high energy igniter and booster pyrotechnic compositions comprising B/KNO3, Zr/KClO4 and Pb(SCN)2/KClO3 as igniter compositions, and B/Mg/KClO4/Bi2O3 and B/Mg/KClO4 as booster compositions. Different ratios of fuels and oxidizers were studied in order to determine the best igniter and booster compositions. The measurement of the calorific values for the igniter and the booster compositions, along with safety tests of the igniter compositions, were performed. The pattern of calorific values observed for the igniter and booster compositions under study were B/KNO3 > Zr/KClO4 > Pb(SCN)2/KClO3 and B/Mg/KClO4 > B/Mg/KClO4/Bi2O3, respectively. The newly-developed high energy igniter compositions passed all of the safety tests. Both igniter and booster compositions were also subjected to functional tests in an impulse cartridge. The functional tests were intended for the determination of peak pressure and time to peak pressure. These high energy igniter and booster compositions increased the peak pressure by 8.3% and reduced the time to peak pressure by 14.3% for an impulse cartridge in a closed chamber of volume 230 cm3. The consequence of this research work is that the best combination of igniter and booster compositions in terms of safety, calorific values and cartridge functionality are Zr/KClO4 (40/60) and B/Mg/KClO4 (30/10/60), respectively.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 933-951
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Tungsten on Aluminized Melt Cast High Explosive Formulations
    Autorzy:
    Mishra, V. S.
    Bhagat. A., L.
    Vadali, S. R.
    Singh, V. K.
    Wasnik, R. D.
    Asthana, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/358355.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    tungsten
    MOUT
    low intensity conflict
    peak over pressure
    impulse
    Opis:
    Aluminized 2,4,6-trinitrotoluene (TNT) based, melt-cast, high explosive compositions are widely used in warheads. These compositions offer a blast effect over a larger period due to the secondary combustion of aluminum. During recent times tungsten based explosives have been reported for lethality at close range to avoid collateral damage in low intensity conflicts (LIC) and find application in shaped charges to enhance their penetration capability. This paper reports findings on tungsten-based, melt-cast, explosive formulations. The compositions were prepared by substituting aluminum with tungsten in the reference aluminized, high explosive formulation. The compositions were characterized for their sensitivity to mechanical/shock stimuli, velocity of detonation (VOD) and blast performance. The study reveals that the impact sensitivity remains comparable on incorporating 10% tungsten at the cost of aluminum whereas an increase in tungsten content to 20% leads to an increase in impact sensitivity. However friction sensitivity and shock sensitivity remained more or less unchanged. The velocity of detonation (VOD) of tungsten-loaded, aluminized formulations is found to be comparable to the standard aluminized formulation. The peak over pressure of tungsten-based formulations is lower than the reference, aluminized composition at close range but is almost unchanged at long range. The impulse of tungsten-based formulations is also lower than the reference, aluminized composition. The reduction in impulse at close range is substantial on replacing 10% aluminum with inert tungsten.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 2; 147-154
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the influences of blending different proportions of propane into methane on combustion characteristics at the knock threshold by using RCM
    Autorzy:
    Shokrollahi, F.
    Wyszynski, M.
    Sundell, J.-P.
    Powiązania:
    https://bibliotekanauki.pl/articles/244926.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    Rapid Compression Machine
    knock threshold operating condition
    peak driving pressure
    knock intensity
    Opis:
    A spark-ignited Rapid Compression Machine (RCM) has been used to investigate the influences of the different proportions of methane-propane mixtures on the combustion characteristics at knock threshold operating condition. First, the threshold operating points of the mixtures have been obtained and the results indicated that the piston driving pressure reduces from 142 bars to 90 bars as the propane content in the mixture increases. As a spark plug was fitted in this RCM, the optimum spark timing was also investigated. It was established that spark timing should be set synchronize with the piston at TDC, due to the free movement of the piston. In most RCMs, piston can move toward TDC following the equilibria of forces due to the absence of con-rod. Finally, knock intensity of the different mixtures has been studied. Pre-heating system in RCM with and without trace heating system; effects of flow-rate and lambda variations on peak pressure, ignition delay time and ARR; threshold operating conditions of pure methane, 90% methane and 10% propane, 80% methane and 20% propane, 70% methane and 30% propane; effect of driving pressure on the knocking intensity for mixture of methane and propane for heavy and light knockings are presented in the article.
    Źródło:
    Journal of KONES; 2018, 25, 1; 339-346
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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