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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of Technological Parameters on the Combustion Velocity of Pyrotechnic Compositions for Gas Generator of Base Bleed Projectiles
    Autorzy:
    Pašagić, S.
    Antonović, D.
    Brzić, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/357928.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic materials
    pyrotechnic compositions
    gas generator charge
    base bleed projectiles
    combustion stability
    Opis:
    The specific purpose of a pyrotechnic mixture for a Gas Generator (GG) of Base Bleed (BB) projectile requires a carefully balanced combustion velocity for obtaining the maximum projectile range and avoiding a reactive propelling force. The development of the pyrotechnic element is done under laboratory conditions which often differ from the real usage conditions. To be able to fairly predict the combustion process characteristics in the real GGs of BB projectiles, some influential technological factors and their influence on the combustion velocity have been investigated. Factors which were observed to have the most significant influence on the combustion velocity of pyrotechnic compositions are charge density, oxygen balance, combustion chamber wall thickness and material type. Individual and combined influence of these factors on the combustion velocity will also be presented in this paper.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 2; 331-346
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combustion stability of dual fuel engine powered by diesel-ethanol fuels
    Autorzy:
    Nowak, Łukasz
    Tutak, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/133775.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    combustion stability
    heat release
    dual fuel
    ignition delay
    combustion phases
    stabilność spalania
    wydzielanie ciepła
    gazodiesel
    opóźnienie zapłonu
    fazy spalania
    Opis:
    The paper presents result of combustion stability assessment of dual fuel engine. The authors analyzed results of co-combustion of diesel fuel with alcohol in terms of combustion stability. The comparative analysis of both the operational parameters of the engine and the IMEP, as the parameters determining the stability of the combustion process, were carried out. It was analyzed, among others values of the COVIMEP coefficient, the spread of the maximum pressure value, the angle of the position of maximum pressure and the probability density distribution of the IMEP. The experimental investigation was conducted on 1-cylinder air cooled compression ignition engine. The test engine operated with constant rpm equal to 1500 rpm and constant angle of start of diesel fuel injection. The engine was operated with ethanol up to 50% of its energy fraction. The influence of ethanol on ignition delay time spread and end of combustion process was evaluated. It turns out that the share of ethanol does not adversely affect the stability of ignition.
    Źródło:
    Combustion Engines; 2019, 58, 3; 155-161
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of polar plasticizers on the characteristics of selected cyclic nitramines
    Autorzy:
    Elbeih, A.
    Zeman, S.
    Pachman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358627.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic materials
    polymers
    sensitivity
    combustion
    thermal stability
    Opis:
    Dioctyl sebacate (DOS) is a plasticizer used with oily material for the softening of polyisobutylene binder (PIB) to form a polymeric matrix. This matrix was used for the preparation of various plastic explosives. The following energetic cyclic nitramines were used as explosive fillers: BCHMX (cis-1,3,4,6- tetranitrooctahydroimidazo [4,5 d]imidazole), ε-HNIW (ε-2,4,6,8,10,12- hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane), RDX (1,3,5-trinitro-1,3,5- triazacyclohexane), and HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane). For comparison, Fluorel binder was used for the preparation of several plastic bonded explosives (PBXs) based on the same selected explosives. Impact and friction sensitivities of the prepared samples and the pure explosive fillers were measured. The thermal stability was studied using differential thermal analysis (DTA). High performance liquid chromatography (HPLC) was used to detect the presence of BCHMX dissolved in dioctyl sebacate (DOS). The heat of combustion of the prepared samples and of the pure explosive fillers was measured using a bomb calorimetry. The results show that PIB softened by plasticizer (DOS) has a greater positive effect on decreasing the impact sensitivity of the studied pure explosives than Fluorel binder. On the other hand, the plasticizer acts as a solvent for the energetic materials and decreases the decomposition temperature of these plastic explosives.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 3; 339-349
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The physical model of changes setting in multilayer bearings
    Autorzy:
    Kowalczyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/242410.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    multilayer bearing
    research
    material stability
    physical model
    Opis:
    This work presents the physical model of changes setting in multilayer bearing of combustion engines. It is known, that the slide bearing of high-load combustion engines independently from manufacturing technology, must have a material stability with regard on diffusion process of the alloy components. The present state of materials used on slide multilayer bearings of combustion engines has not changed during the last 30-year. Only small changes and modifications of material multilayer bearings, with the use of the same groups of materials, independently from specific manufacturing technology of bearing and their use were observed. The change of bearings materials. growth of operating requirements of combustion engines, ecological limitation and the price of materials may force changes in present constructional and technological conception of multilayer, in range of materials selection and huilding the bearings. This work presents the physical model of changes setting in multilaver bearing on different building. U was found that the slide bearing of high-load combustion engines is not physically and thermally stable up to l80 centigrade. Different models show that after heating, all phases and structural components present on graph of equilibrium in given temperature are not created.
    Źródło:
    Journal of KONES; 2009, 16, 1; 281-288
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of the precise position of the aircraft in air navigation based on the solution of the RTK-OTF technique
    Autorzy:
    Kowalski, M.
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/242780.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engine
    Diesel engine
    engine piston
    composite alloy
    thermal stability
    Opis:
    Certain results of the comparative studies of the high-speed Diesel engine V-12 of the “W” series were presented in the article. The engine was modernised in regard of possibilities to achieve better performances at specific fuel consumption, smaller exhaust emission, smaller scavenge, lower noise and better thermal stability. The subject of this work is the piston cast of novel composite silumin. The development of novel composite silumin (aluminium-silicon alloy), which contains a little more Copper and Nickel, and the introduction of novel alloyed elements, such as Chromium, Molybdenum, Tungsten, increases the strength of the alloy and its thermal stability during successive heating and cooling. The pistons made of this alloy may have a little bigger outside diameter than the pistons made of PA-12 standard alloy, and a smaller clearance between the piston and cylinder liner. The pistons made of standard and novel alloy were mounted successively in the "W" engine. The full load and part load curves were determined. The lubrication oil consumption, fuel consumption, exhaust emission, blow-by and noise were determined too. The article presents the results of the above-mentioned research. The novel composite alloy enables further engine modernization because the engine should operate at higher pressure and temperature in the combustion chamber.
    Źródło:
    Journal of KONES; 2017, 24, 4; 99-108
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research performance of novel design of diesel engine
    Autorzy:
    Kowalski, M.
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949487.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engine
    Diesel engine
    engine piston
    composite alloy
    thermal stability
    Opis:
    Certain results of the comparative studies of the high-speed Diesel engine V-12 of the “W” series were presented in the article. The engine was modernised in regard of possibilities to achieve better performances at specific fuel consumption, smaller exhaust emission, smaller scavenge, lower noise and better thermal stability. The subject of this work is the piston cast of novel composite silumin. The development of novel composite silumin (aluminium-silicon alloy), which contains a little more Copper and Nickel, and the introduction of novel alloyed elements, such as Chromium, Molybdenum, Tungsten, increases the strength of the alloy and its thermal stability during successive heating and cooling. The pistons made of this alloy may have a little bigger outside diameter than the pistons made of PA-12 standard alloy, and a smaller clearance between the piston and cylinder liner. The pistons made of standard and novel alloy were mounted successively in the "W" engine. The full load and part load curves were determined. The lubrication oil consumption, fuel consumption, exhaust emission, blow-by and noise were determined too. The article presents the results of the above-mentioned research. The novel composite alloy enables further engine modernization because the engine should operate at higher pressure and temperature in the combustion chamber.
    Źródło:
    Journal of KONES; 2017, 24, 4; 99-108
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regarding the Influence of High Frequency Combustion Instabilities on Operation of Solid Rocket Motors
    Autorzy:
    Safta, D.
    Vasile, T.
    Ion, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/403482.pdf
    Data publikacji:
    2011
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    thermodynamics of rocket propulsion
    unsteady solid propellant combustion
    combustion instabilities
    pressure-coupled response
    rocket motor
    operation stability
    Opis:
    High frequency combustion instabilities imply a major risk for the solid rocket motor's stable operation and they are directly linked to the response of the solid propellant to the pressure coupling. Our paper aims at defining a linearized onedimensional flow study model of the solid propellant rocket motors' disturbed functioning analysis. Experimental researches were done with an adequate setup, built and improved in our lab, functioning on the basis of the nozzle throat intermittent modulating technique developed by ONERA researchers, able to evaluate the propellant response by the interpretation of the pressure oscillations damping in terms of propellant response.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2011, 2, 1 (3); 7-24
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and verification failures of a combustion engine injection system
    Modelowanie i weryfikacja uszkodzen ukladu wtryskowego silnika spalinowego
    Autorzy:
    Dziubinski, M.
    Czarnigowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/793621.pdf
    Data publikacji:
    2011
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    internal combustion engine
    verification failure
    modelling
    idle speed
    control
    sensor failure simulation
    toxic gas
    fuel consumption
    engine work stability
    Opis:
    Growing pressure to improve the performance of IC engines has resulted in development of improved control systems. These requirements, combined with the introduction of control algorithms that could only be simulated experimentally were the foundations of control-oriented modelling techniques. The paper presents the assumptions and requirements toward control oriented models and a model of an idling SI engine. Some results of identification and verification tests of the model are presented for the 1.5 GLI engine. On the basis of the engine model, the simulation of sensor failures had been carried out.
    Rosnące wymagania stawiane silnikom spalinowym przyczyniają się do wprowadzania nowych systemów sterowania Wymagania te związane są z opracowaniem nowych algorytmów sterowania, które powinny być wyznaczane drogą eksperymentalną i w postaci modelowania. Artykuł przedstawia przyjęte założenia i wymagania dotyczące modelowania w aspekcie sterowania wolnych obrotów silnika. Wybrane badania identyfikacji i weryfikacji w postaci testów przeprowadzono dla modelu silnika 1.5 GLI. Na bazie modelu silnika przeprowadzono symulacje typowych uszkodzeń czujników.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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