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    Wyświetlanie 1-4 z 4
    Tytuł:
    Laserowe znakowanie, kodowanie i grawerowanie - kierunki rozwoju technologii i nowe obszary aplikacji
    Laser marking, coding and engraving - technology development directions and new applications areas
    Autorzy:
    Boruc, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/270098.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    laserowe znakowanie
    kodowanie
    laser marking
    coding
    engraving
    Opis:
    W artykule przedstawiono nowe możliwości laserowego znakowania kodowania i grawerowania. Wskazano nowe obszary zastosowań, a także kierunki rozwoju tej techniki obróbki. Przedstawiono źródła sukcesu tej techniki, m.in.: szeroka paleta oferowanych systemów, dopasowanych do potrzeb aplikacji, łatwość użycia i dostępność dla coraz szerszej grupy odbiorców.
    In this paper new possibilities of laser marking, coding and engraving were presented. New areas of methods' applications, modern machine-tools and development directions of these manufacturing techniques were indicated. On the ground of conducted analysis one affirmed, that a source of commercial success were, among other: wide palette of the different lasers, fitted very well for the individual application, easy operation and affordability for the growing number of potential users.
    Źródło:
    Inżynieria Maszyn; 2011, R. 16, z. 4; 124-128
    1426-708X
    Pojawia się w:
    Inżynieria Maszyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the possibilities of adapting a constant volume combustion chamber for research on ignition of hypergolic propellants under low and high-pressure conditions
    Autorzy:
    Krzesicki, M.
    Boruc, Ł.
    Kapusta, Ł. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/133317.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    hypergolic ignition
    hypergolic propellant
    ignition delay
    drop test
    constant volume combustion chamber
    zapłon hipergoliczny
    opóźnienie zapłonu
    komora spalania o stałej objętości
    Opis:
    In this study, the adaptation possibilities of a constant volume combustion chamber (CVCC) for research on the ignition of hypergolic propellants are presented. The application of hypergolic bipropellants and crucial parameters regarding their ignition behaviour are discussed. The initial studies on ignition delay measurements presented here does not cover the whole range of conditions present in practical systems where hypergolic ignition occurs. In the study, a need for an evaluation of the influence of pressure on the ignition delay was indicated as the reason to conduct research on hypergolic ignition in low and high-pressure environments. Moreover, the study reviews the state-of-the-art experimental methods of investigating the ignition under atmospheric, low and high-pressure conditions, including those utilizing a constant volume combustion chamber. The drop test was pointed out as the most commonly used method; this makes it advantageous in terms of comparing the results with those obtained by other researchers. Therefore, the drop test was selected as a method to be used in a CVCC. The test rig developed here was designed based on a CVCC initially designed for diesel sprays’ visualization in high-pressure conditions. All the required modifications, especially the design of the oxidizer dosing unit, are presented in the study.
    Źródło:
    Combustion Engines; 2018, 57, 2; 9-13
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of the back pressure influence on urea-water-solution mixing performance in close coupled SCR system
    Autorzy:
    Rogóż, R.
    Bachanek, J.
    Boruc, Ł.
    Teodorczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/245838.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    SCR
    urea water solution
    uniformity
    CFD
    back pressure
    Opis:
    The upcoming Euro 6d emission standard puts more even stringent requirements for diesel engine cars, especially in the case of nitrogen oxides (NOx) emission. The most widely used technique to meet tight standards is Selective Catalytic Reduction (SCR) with urea-water-solution (UWS) injection. One of the crucial factors is even ammonia distribution at the catalyst inlet; hence, very often product development is focused around this issue. The product development is supported by both experimental and numerical work. The common approach to measure cross section ammonia distribution on the SCR is using sampling system at catalyst outlet. Very often exhaust layout is opened just after the SCR catalyst, cutting off the rest part for instance tailpipe or Clean-up Catalyst. Therefore, a backpressure at SCR outlet resulting from the downstream part is also eliminated. This could significantly affect flow parameters as the density changes, thus ammonia distribution and wall film deposition may vary as well. Within this work, the influence of the backpressure at SCR outlet on the ammonia distribution and wall wetting was numerically investigated. The simulations were run under various boundary conditions for the Close Coupled SCR architecture. It was shown that depending on the operating point the boundary pressure affects both factors on the different level.
    Źródło:
    Journal of KONES; 2018, 25, 3; 377-383
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resistojet thruster with a power system based on supercapacitors
    Autorzy:
    Mezyk, L.
    Kobiera, A.
    Boruc, L.
    Biczel, P.
    Wolanski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/115727.pdf
    Data publikacji:
    2014
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    resistojet
    thruster
    satellite
    ster strumieniowy
    satelita
    Opis:
    This paper presents research into a resistojet model that can be powered by supercapacitors for satellite propulsion applications. The performance of the system, calculated including a preliminary study of mass and power budget, shows that this solution has potential for a certain range of space missions. The main problem when designing a pulsed resistojet is the compromise between the thermal capacity of the resistojet and the heat transfer efficiency of the device. When the heater is used in pulsed mode, it should have low mass and thermal capacity in order to reduce the energy required to heat the devices. On the other hand, the main technical restriction in resistojet thrusters is heat transfer due to the laminar regime of the flow in the heater. The heat transfer area should be as large as possible, but the mass of the device limits any such increase in area. In this research several design options were considered in an attempt to find the optimal solution. After research on the oscillating element and porous heater, capillary tubes directly heated by the current were determined to be the most effective solution. A power supply based on supercapacitors was constructed. It consists of 30 supercapacitors of 300 F each, connected to deliver 70 V of voltage, 10F of total capacitance and maximum peak power of 5 kW. Research for three different gases – ammonia, propane and butane – was conducted and the results are presented in this paper.
    Źródło:
    Challenges of Modern Technology; 2014, 5, 3; 13-21
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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