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Wyszukujesz frazę "vortex cooling" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of air cooling and air-jet vortex generator on flow structure in turbine passage
    Autorzy:
    Szwaba, R.
    Flaszyński, P.
    Szumski, J. A.
    Doerffer, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938634.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska
    Tematy:
    shock wave
    separation control
    air-jet vortex generator
    blade cooling
    Opis:
    The paper concerns the experimental investigations and numerical simulations of a high loaded model of a turbine blade. An increase in the blade load leads to enlargement of a local supersonic zone terminated by a shock wave on the suction side. The Mach number upstream of the shock reaches up to 1.6. The interaction of the shock wave with a boundary layer at such a high Mach number leads to a strong separation. Streamwise vortices generated by air-jets were used for the interaction control. The work presents the experimental and numerical results of the application of an air-jets vortex generator on the suction side of cooled turbine blades. Very interesting results were obtained in the context of the air cooling and air-jet vortex generator influence on the flow structure in the turbine passage.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 153-166
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of grinding technology with vortex cooling of steels that are liable to crack propagation
    Autorzy:
    Ivanova, Tatiana Nikolaevna
    Biały, Witold
    Nordin, Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2064897.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    steel
    grinding
    temperature
    vortex cooling
    wheel
    Opis:
    Complexity of grinding process and phenomena entailing it not always allow reaching required technological results, especially while machining surfaces of parts made of tough-to-machine steels, which are liable to crack propagation. Cracks can occur in these parts during grinding due to considerable temperature difference along the section, which can cause formation of high temporary internal tensile stress. Application of cooled air in grinding process exerts considerable influence over temperature decrease in cutting area. In addition, it depends not only on heat exchange, but also on properties of cold air flow. The greatest effect of temperature decrease can be reached by injection of cold air flow in cutting area with implementation of vortex effect, which occurs in swirl flow of compressed air originating in vortex tube. The study of heat generation during machining by tools with discontinuous cutting surface and vortex air cooling was carried out. Obtained thermophysical parameters of vortex air cooling (increase in speed of stream flowing, expansion degree, share of cold stream and decrease in humidity of air stream) allow reducing heat density due to growth of cooling effect in grinding zone. On the base of experimental studies we developed recommendations for choice of optimal grinding modes by tool with discontinuous cutting surface and vortex air cooling of flat parts made of steels being liable to cracking.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 9--23
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Prospects of Abrasive Treatment of Tough-To-Machine Materials
    Autorzy:
    Palacz, Magdalena
    Ivanova, Tatiana N.
    Kozlov, Alexander M.
    Kaniak, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2064680.pdf
    Data publikacji:
    2021
    Wydawca:
    STE GROUP
    Tematy:
    face grinding
    grinding wheel
    steel
    vortex air cooling
    cooling-lubricant technological fluid
    Opis:
    In current conditions, great attention is paid to the quality of parts, which is in many ways determined by finishing operations of mechanical treatment, with surface grinding being the most widespread. Grinding process efficiency, abrasive tool wear intensity, machined surface quality and other features of grinding process depend on properties of the environment, where the cutting process takes place. Forced changing of conditions of this environment is one of the ways to control and optimize the grinding process, which can be reached due to finding new technological decisions. One of the most promising directions to solve this problem is the process of face grinding with discontinuous grinding tool and supply of cooling fluid or air in the cutting zone directly. Carried analysis of features of face grinding has shown that heat density can be decreased by the usage by grooved wheels with vortex air cooling or by supply of cooling-lubricant technological fluid. Obtained dependences of temperature field of part surface during grinding establish the influence of the length of working shoulders and grooves, vortex tubes number, outflow rate, temperature and flow rate of cold vortex flow of air. These data provide conscious control over the process of discontinuous face grinding by changing wheel grain size and grinding speed.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 166--177
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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