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    Wyświetlanie 1-6 z 6
    Tytuł:
    Research on the Detonation Process of Explosives Containing Sodium Azide
    Autorzy:
    Papliński, Andrzej
    Maranda, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/358383.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    sodium azide
    detonation performance
    aluminized explosives
    Opis:
    The detonation performance of aluminized energetic materials with enriched nitrogen content is examined. Sodium azide (NaN3, SA) was considered as the component to enhance the nitrogen content in explosive mixtures. SA explosives based on hexogen (RDX) as the representative C-H-N-O explosive, and on ammonium nitrate(V) (NH4NO3, AN) were investigated. Powdered (Alp) or flaked (Alf) aluminum was added as an energetic additive. Detonation of mixtures with added SA revealed highly non-ideal behaviour. Thermodynamic evaluations have been carried out to assess the magnitude of the energy evolved in explosives with added SA, as well as to examine the possible influence of the formation of aluminum nitride (AlN(s)) on the detonation and explosion parameters. The results obtained indicated that, despite the relatively low observed detonation velocities, aluminized RDX/Al/SA and AN/Al/SA mixtures may attain explosion energies of about of 6 MJ/kg and higher. A considerably lower energetic outcome from the formation of AlN(s), in comparison with Al2O3(s), was noted.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 4; 520-532
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Detonation Pressure and Velocity of Explosives with Micrometer Aluminum Powders
    Autorzy:
    Zhang, Q.
    Chang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358334.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    aluminized explosives
    detonation pressure
    nonideal explosives
    detonation velocity
    Opis:
    The data reported shows that the Chapman-Jouguet (CJ) detonation parameters of non-ideal explosives calculated from existing thermodynamic computer codes are significantly different from experimental results. We use CJ detonation theory to present a new approach predicting detonation pressure and velocity of aluminized explosives by thermodynamic detonation theory. There is no need to use the assumption of full and partial equilibrium of aluminum powder in reaction zones in the new approach. In this work the best agreement with experimental data was obtained by adjusting the parameter k in the Becker- Kistiakosky-Wilson equations of state (BKW-EOS). The detonation pressure and velocity values calculated by the present method agree well with the experimental results. All of the deviations for the calculated pressures of aluminized explosives are less than 9% and those for the detonation velocities are less than 7%.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 1; 77-86
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Predictive Method for the Heat of Explosion of Non-ideal Aluminized Explosives
    Autorzy:
    Zhang, Q.
    Chang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358737.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    aluminized explosives
    heat of explosion
    thermodynamic
    nonideal explosives
    high energy materials
    Opis:
    The heat of explosion is one of the most important thermodynamic parameters of aluminized explosives. Two improvements in numerical calculations to predict the behaviour of the explosion of non-ideal aluminized explosives were completed in this work. The chemical reaction between aluminum and the C-J detonation products of high energy ingredients was determined and the equation of state for the detonation products of high energy ingredients was revised. The constant k in the BKW equation was revised to obtain perfect results for predicting the C-J parameters for high energy ingredients. The predicted results show that the heats and temperatures of aluminized explosives become maximized when the mass fraction of aluminum powder is 30%, which is in good agreement with the results obtained by empirical formulae.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 4; 541-554
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of the Explosion of Aluminized Explosives in Air
    Autorzy:
    Chen, Y.
    Xu, S.
    Wu, D. J.
    Liu, D. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/358676.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    explosion in air
    aluminized explosives
    boron powders
    TNT equivalence
    fireballs
    Opis:
    Piezoelectric gauges were used to measure the shock wave overpressure of aluminized explosives and of a TNT charge. An infrared thermal-imaging spectrometer was used to collect the infrared signatures produced by the explosion fireball when the examined explosives were detonated. The measurement of the infrared signatures was used to estimate the surface temperatures and the dimensions of the fireball. Two aluminized explosive compositions (RDX/Al/AP and RDX/Al/B/AP) have been analyzed. 500 g charges of the aluminized explosives were prepared and studied, and their TNT equivalences were calculated according to the experimental data and the explosion law. The highest surface temperatures of the fireballs of these aluminized explosives were up to 1600 °C, which was higher than that of the TNT charge. In the region of the highest surface temperature above 700 °C, the duration for the composition RDX/Al/AP was about 232 ms (2.73 times more than TNT), whilst RDX/Al/B/AP was about 360 ms. The fireballs obtained from the explosion of these aluminized explosives had larger dimensions than that of TNT, especially when the surface temperature was above 1000 °C. The test results indicate that the addition of boron powders to aluminized explosives is a good way to enhance their blast effect, to improve the temperature of the explosion field and to prolong the duration of the higher temperature.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 1; 117-134
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underwater Explosion Performance of RDX/AP-based Aluminized Explosives
    Autorzy:
    Xiang, D.
    Rong, J.
    He, X.
    Feng, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/358616.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    UNDEX
    RDX/AP-based aluminized explosives
    detonation
    shock wave
    Al/O ratio
    Opis:
    To understand the underwater explosion (UNDEX) performance of RDX/AP-based aluminized explosives, six formulations of the explosives were prepared, with Al content varying from 30% to 55% and ammonium perchlorate (AP) content from 45% to 20%. A series of UNDEX tests that used a 1 kg cylindrical charge was conducted underwater at a depth of 4.7 m. The pressure histories of the shock wave produced at different positions and the bubble periods were measured. The coefficients of the similarity law equation for the shock wave parameters were fitted with experimental data. The effect of the aluminum/oxygen (Al/O) ratio on the performance of the energy output structure for RDX/AP-based aluminized explosives is discussed. The bubble motion during UNDEX was simulated using MSC.DYTRAN software, and the radius-time curves of the bubbles were determined. The results show that AP influences the detonation reaction mechanism of RDX/AP-based aluminized explosives, which causes different UNDEX performances. The bubble energy of the RDX/AP-based aluminized explosive was higher than that of RDX-based and HMX-based aluminized explosives.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 60-76
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar temperatury dopalania obłoku produktów wybuchu za pomocą dwuzakresowej fotodiody
    Measurement of explosion afterburning fireball temperature by dual-band photodiode
    Autorzy:
    Wieja, Łukasz
    Paszula, Józef
    Powiązania:
    https://bibliotekanauki.pl/articles/236282.pdf
    Data publikacji:
    2019
    Wydawca:
    Wojskowy Instytut Techniczny Uzbrojenia
    Tematy:
    obłok produktów wybuchu
    aluminizowane materiały wybuchowe
    amonale
    pomiary temperatury
    fotodioda dwuzakresowa
    spektroskopia
    fireball
    aluminized explosives
    ammonals
    temperature measurements
    dual-range photodiode
    spectroscopy
    Opis:
    Istotnym parametrem podczas szacowania efektywności wybuchu mieszanin termobarycznych jest ich temperatura dopalania. W ramach niniejszej pracy dokonano przeglądu powszechnie stosowanych metod pomiaru temperatury dopalania obłoku produktów wybuchu, takich jak spektroskopia, pirometria optyczna, termowizja. Przedstawiono również metodę pomiaru ciągłego za pomocą dwuzakresowej fotodiody o zakresach pracy 400-1100 nm i 1000-1800 nm. Wysoka rozdzielczość czasowa tej metody pozwala na identyfikację szybkich zmian temperatury, wynikających na przykład z przejścia przez dopalający się obłok produktów wybuchu odbitej fali podmuchowej. Przedstawiono główne założenia metody oraz wyniki wstępnych pomiarów i porównano je z pomiarami spektrometrycznymi dla tych samych ładunków. Pomiary przeprowadzono dla mieszanin azotanu (V) amonu z aluminium i z PAM.
    A temperature of terminal combustion (afterburning) of thermobaric mixtures is an important parameter of explosion effectiveness. The paper revews typical methods of spectroscopy, optical pyrometry, and thermovision for measuring the terminal combustion temperature of a fireball of explosion products. A method of continuous measurement by a dual-band photodiode operating on 400-1100 nm and 1000-1800 nm is presented. Method’s high time resolution allows for the identification of rapid temperature changes resulting, for example, from the passage of a reflected blast wave through the fireball. The main assumptions of the method, the results of preliminary measurements and their comparison with spectrometric measurements for the same charges are presented. The measurements were carried out for mixtures of ammonium nitrate (V) with aluminum and with PAM.
    Źródło:
    Problemy Techniki Uzbrojenia; 2019, 48, 152; 57-76
    1230-3801
    Pojawia się w:
    Problemy Techniki Uzbrojenia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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