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Wyszukujesz frazę "gas velocity" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Experimental research and CFD calculations based investigations into gas flow in a short segment of a heavily worn straight through labyrinth seal
    Autorzy:
    Joachimiak, D.
    Krzyślak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/258744.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    labyrinth seals
    turbomachines
    fluid-flow machines
    experiment
    CFD
    gas velocity
    Opis:
    Steam turbines are used as propulsion components in not only power plants but also on merchant and naval ships. The geometry of the steam turbine seals changes throughout the machine life cycle. The rate of deterioration of these seals, in turn, affects heavily the efficiency of the thermal machine. However, the literature overview does not provide any research reports on flow phenomena occurring in heavily deteriorated seals. The paper describes the course and results of investigations into a model straight through labyrinth seal composed of 4 discs, each with the slot height of 2 mm. The investigations have been conducted with air as the working medium. Changes of gas flow parameters due to wear were analysed. Based on the experimental data, more intensive leakage was observed as the result of the increased slot height. The static pressure distribution along the examined segment was measured. The experimentally recorded distribution differed remarkably from the theoretical assumptions. Another part of the experimental research focused on comparing the gas velocities at points situated upstream of the first and second seal disc. The velocity measurements were carried out using a constant temperature wire probe. This part of the investigations provided opportunities for analysing the influence of seal wear on gas flow conditions in the seal segment. The paper compares the results of the experimental research with those obtained using the CFX software. The presented results of velocity distributions provide a clear picture of the nature of the gas flow in the seal, which enables its analysis.
    Źródło:
    Polish Maritime Research; 2017, 2; 83-88
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Force exerted by gas on material ejected during gas-geodynamic phenomena analysis and experimental verification of theory
    Autorzy:
    Kozieł, Katarzyna
    Janus, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/2203340.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gaz
    wybuch gazu
    geodynamika
    gas velocity
    force
    rock and gas outbursts
    gas-geodynamic phenomena
    ejected material
    Opis:
    The analysis of natural hazards, including gas-geodynamic phenomena, requires study of the basic physical processes that take place at each stage of an event. This paper focuses on analysing the transport of fragmented rock material during rock and gas outbursts. Our theoretical considerations and experiments have allowed us to specify and verify the significant forces acting on fragmented rock during its transport, thus determining the speed of grains of each grain class in the stream of expanding gas. The above study may serve as a preface to a wide-ranging quantitative and qualitative energy analysis of the movement of material ejected during Gas-geodynamic phenomena.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 3; 491--508
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monthly dynamics of carbon dioxide exchange across the sea surface of the Arctic Ocean in response to changes in gas transfer velocity and partial pressure of CO2 in 2010
    Autorzy:
    Wrobel, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/48876.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    carbon dioxide
    sea surface
    Arctic Ocean
    gas flux
    global carbon budget
    gas velocity
    wind speed
    Opis:
    The Arctic Ocean (AO) is an important basin for global oceanic carbon dioxide (CO2) uptake, but the mechanisms controlling air—sea gas fluxes are not fully understood, especially over short and long timescales. The oceanic sink of CO2 is an important part of the global carbon budget. Previous studies have shown that in the AO differences in the partial pressure of CO2 (DpCO2) and gas transfer velocity (k) both contribute significantly to interannual air—sea CO2 flux variability, but that k is unimportant for multidecadal variability. This study combined Earth Observation (EO) data collected in 2010 with the in situ pCO2 dataset from Takahashi et al. (2009) (T09) using a recently developed software toolbox called FluxEngine to determine the importance of k and DpCO2 on CO2 budgets in two regions of the AO — the Greenland Sea (GS) and the Barents Sea (BS) with their continental margins. Results from the study indicate that the variability in wind speed and, hence, the gas transfer velocity, generally play a major role in determining the temporal variability of CO2 uptake, while variability in monthly DpCO2 plays a major role spatially, with some exceptions.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interior Perforation Flow Field Study of Partially Cut 7-Perforated Stick Propellants
    Autorzy:
    Zhao, Xiaoliang
    Zhang, Xiaobing
    Powiązania:
    https://bibliotekanauki.pl/articles/358092.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    partially cut
    7-perforation stick propellants
    internal perforation flow field
    pressure difference
    gas velocity
    Opis:
    Partially cut 7-perforated propellants are used in gun charges because of their good flame spreading, high progressivity and loading density. To investigate the complex flow field in a partially cut multi-perforation stick propellant, a steady three-dimensional model for compressible viscid internal perforation and the vent gas region flow field was established and simulated by ANSYS Fluent. The results illustrate that the cut vent can decrease the internal perforation pressure and end face gas velocity. Moreover, the mass that escaped through the vent to the outside was 85.3% of the whole internal burning propellant gas. When the width of the cut slot was larger than half the diameter, the internal pressure decreased weakly and the progressive intensity decreased slightly as the cut slot was increased. As the same side intervals were increased or the perforation diameters were decreased, the end face gas velocity and the internal and external perforation pressure differences increased, and the propellant combustion area progressive intensity increased. As the web thickness increased, the internal pressure increased, and gas velocity exhibited an upward tendency and reached peak values when 2e1 = 0.84 mm, whilst the progressive intensity increased slightly.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 4; 564-582
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis on the velocity of dust particles in the plate-type electrostatic precipitators used in thermoelectric power plants
    Autorzy:
    Popa, G. N.
    Şora, I.
    Dinis, C. M.
    Deaconu, S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/207451.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electrostatic precipitators
    mathematical models
    thermoelectric power plants
    dust particles
    gas velocity
    power plant
    elektrofiltry
    model matematyczny
    elektrownia
    cząstki pyłu
    prędkość gazu
    Opis:
    Experimental data collected from different plate-type electrostatic precipitators used in a thermoelectric power plant has been analyzed. The following parameters were considered: the collection efficiency, average migration velocity of dust particles, velocity distribution of the gas in the input and output channels of precipitators. The average migration velocity of dust particles can be estimated using various mathematical models, and the gas velocity can be computed using the velocity distributions from the input channels of the precipitators. The traveling time of dust particles between the electrodes is smaller than the traveling time along the precipitator sections.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 85-102
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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