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Wyszukujesz frazę "internal flow field" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Numerical analysis of internal flow phenomena in a multi-blade centrifugal fan
    Autorzy:
    Wang, J.
    Ou, Y.
    Wu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964163.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    multi-blade centrifugal fan
    internal flow field
    CFD
    Opis:
    A three-dimensional, steady, incompressible, turbulent flow field inside a multi-blade centrifugal fan used in an air-conditioner has been analyzed numerically. Reynolds-averaged Navier-Stokes equations with the standard k-epsilon turbulence model have been discretized by the finite volume method. The calculation results have shown complex three-dimensional characteristics of the flow, especially in the blade passages near the shroud side. The results have revealed a boundary layer separating the flow from the leading edge on the blade suction surface, the flow's reversal from the high pressure region inside the volute to the low pressure region near the impeller inlet, the flow's recirculation near the shroud side, a jet-wake pattern at the rotor exit, pressure fluctuation on the blade surface, etc. Some of the numerical results agree well with previous experiment.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 2; 245-256
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of the tip vortex in an air-conditioners propeller fan
    Autorzy:
    Wang, J.
    Wu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955218.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    tip vortex
    internal flow field
    propeller fan
    numerical simulation
    Opis:
    A steady, incompressible, turbulent flow field inside a propeller fan used in an air conditioner has been analyzed numerically using the single-equation Spalart-Allmaras turbulence model. It has been found that the formation of tip vortex starts from the blade tip's suction side at about one third of the axial chord's length aft of the rotor's leading edge. It is due to the rolling-up of the intense shear layer flow between the main axial flow and the suck-in inward flow caused by the large pressure difference between the pressure and the suction sides. The tip vortex passes through the blade passage in a curve reversed towards the direction of the blade's rotation. Its trace is partial to the tangential direction as it goes into the aft part of the blade passage covered by the shroud and, simultaneously, its trace in the radial direction is turned from the outward direction to the inward direction. The operating flow rates have an important effect on the axial position of the tip vor-tex's trace, while its effect on the radial position is negligible. At law flow rates, the vortex disappears at a location closer to the leading edge. The effect of the shroud's width on the tip vortex's trajectory is notable. For a fan with a wide shroud, the trace of the tip vortex moves upstream with a smaller radial influence region than that of a fan with a narrower shroud.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 2; 101-112
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    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:
    Analysis of abnormal vibrations of crude oil efflux pumps using Ansys
    Autorzy:
    Wang, Tianqi
    Xie, Lei
    Yu, Hongsheng
    Wei, Xiuliang
    Dong, Pengmin
    Zhao, Tianyi
    Powiązania:
    https://bibliotekanauki.pl/articles/2200858.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    abnormal vibrations
    internal flow field
    Ansys
    Opis:
    In this study, abnormal vibrations of 1 pump fluid in a crude oil efflux station in the Changqing Oilfield was investigated. Kinetic simulation was applied to flow fields in the crude oil efflux pump using Ansys to determine trends of the impeller static pressure, speed, total pressure, wall pressure of the impeller, outlet pressure and pressure on the pump shell and to identify the reasons behind the abnormal vibrations. The results indicated that the axial vibration amplitude of the pump could be reduced from 1.3mm down to 0.68mm if the operation parameters of the external control oil pump were set as 2500-2550r/min and 325-335m3/h, respectively.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 23--36
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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