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Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F18%3APU127527" target="_blank" >RIV/00216305:26210/18:PU127527 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://www.sciencedirect.com/science/article/pii/S0017931017356879" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0017931017356879</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.02.090" target="_blank" >10.1016/j.ijheatmasstransfer.2018.02.090</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers

  • Popis výsledku v původním jazyce

    Spill-return (SR) atomizers enhance the construction of Simplex atomizers by addition of a passage in the rear wall of the swirl chamber through which the liquid can be spilled away. It allows to discharge the liquid always at a high pressure and to spray well over a wide flow rate range. The spray characteristics of pressure-swirl atomizers are strongly linked to the internal flow, and the air-core dynamics affect the spray stability. The SR atomizers are rarely investigated and their internal flow is not studied at all. Therefore, in this paper, the Simplex and SR atomizers with a central SR orifice were examined comparatively. Transparent polymethyl methacrylate (PMMA) models of both atomizers scaled 10:1 were manufactured for the visualization and velocity measurements of the flow inside the swirl chamber. The atomizers were examined by means of high-speed imaging, laser-Doppler anemometry and computational fluid dynamics tools. The experimental and numerical results were analysed and compared in terms of the spray cone angle (SCA), discharge coefficient (CD), and the morphology and temporal stability of the air core. The internal flow characteristics between the original and the model were matched using the Reynolds, Swirl and Froude numbers. The test conditions were limited to inlet Reynolds numbers from 750 to 1750. The results show that the addition of the spill passage strongly affects the internal flow even when the spill-line is closed. The air core in the Simplex atomizer is fully developed and stable for all flow regimes. The SR atomizer behaved differently; with the closed spill-line (spill-to-feed ratio, SFR = 0), the air core does not form at all; therefore, the spray is unstable. The reason is that the liquid, contained in the spill-line, is drained back into the swirl chamber due to a recirculation zone found inside the spill-line. Increasing the SFR stabilizes the internal flow, and the spray becomes stable if SFR > 0.15. The air core begins to f

  • Název v anglickém jazyce

    Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers

  • Popis výsledku anglicky

    Spill-return (SR) atomizers enhance the construction of Simplex atomizers by addition of a passage in the rear wall of the swirl chamber through which the liquid can be spilled away. It allows to discharge the liquid always at a high pressure and to spray well over a wide flow rate range. The spray characteristics of pressure-swirl atomizers are strongly linked to the internal flow, and the air-core dynamics affect the spray stability. The SR atomizers are rarely investigated and their internal flow is not studied at all. Therefore, in this paper, the Simplex and SR atomizers with a central SR orifice were examined comparatively. Transparent polymethyl methacrylate (PMMA) models of both atomizers scaled 10:1 were manufactured for the visualization and velocity measurements of the flow inside the swirl chamber. The atomizers were examined by means of high-speed imaging, laser-Doppler anemometry and computational fluid dynamics tools. The experimental and numerical results were analysed and compared in terms of the spray cone angle (SCA), discharge coefficient (CD), and the morphology and temporal stability of the air core. The internal flow characteristics between the original and the model were matched using the Reynolds, Swirl and Froude numbers. The test conditions were limited to inlet Reynolds numbers from 750 to 1750. The results show that the addition of the spill passage strongly affects the internal flow even when the spill-line is closed. The air core in the Simplex atomizer is fully developed and stable for all flow regimes. The SR atomizer behaved differently; with the closed spill-line (spill-to-feed ratio, SFR = 0), the air core does not form at all; therefore, the spray is unstable. The reason is that the liquid, contained in the spill-line, is drained back into the swirl chamber due to a recirculation zone found inside the spill-line. Increasing the SFR stabilizes the internal flow, and the spray becomes stable if SFR > 0.15. The air core begins to f

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10305 - Fluids and plasma physics (including surface physics)

Návaznosti výsledku

  • Projekt

    Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2018

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    International journal of heat and mass transfer

  • ISSN

    0017-9310

  • e-ISSN

    1879-2189

  • Svazek periodika

    123

  • Číslo periodika v rámci svazku

    1

  • Stát vydavatele periodika

    GB - Spojené království Velké Británie a Severního Irska

  • Počet stran výsledku

    10

  • Strana od-do

    805-814

  • Kód UT WoS článku

    000434887000067

  • EID výsledku v databázi Scopus

    2-s2.0-85043579555