Effect of Geometric Factors on Spray Characteristics and Stability for Small Spill-Return Pressure-Swirl Atomizers

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Effect of Geometric Factors on Spray Characteristics and Stability for Small Spill-Return Pressure-Swirl Atomizers

Popis výsledku v původním jazyce

Pressure-swirl (PS) atomizers are popular for the simple construction and wide turn-down ratio of their spill-return (SR) versions. In this work, we experimentally investigated a small SR PS atomizer with aim to find the effect of entry port number (2, 3 and 4), swirl chamber shape (hemispheric; conical; curved convex and flat conical), SR design (axial and off-axis spill orifices) and manufacturing precision on the spray quality and stability. The characteristics (droplet size in the spray, the spray cone angle, pressure pulsations and discharge coefficient) were studied using phase-Doppler anemometry, high-speed visualization and a pressure-fluctuation sensing. The tests were provided with Jet A-1 fuel at inlet pressures of 0.5, 1.0 and 1.5 MPa and for spill/feed ratios (SFRs) of 0.4 and 0.8. The swirl chamber shape influenced the spray stability; conical chambers were more stable than others. The spray was found circumferentially heterogeneous; its uniformity improved with the increases in the swirling inlets number and the inlet pressure. Atomizers with axial spill orifice at SFR = 0 demonstrated strong spray pulsations while atomizers with the off-axis spill orifices produced a stable spray. Periodical decay of the air core was suggested as the pulsation reason. The manufacturing precision, axial symmetry and matching of the surfaces of connected parts was found important for the spray symmetry and homogeneity.

Název v anglickém jazyce

Effect of Geometric Factors on Spray Characteristics and Stability for Small Spill-Return Pressure-Swirl Atomizers

Popis výsledku anglicky

Pressure-swirl (PS) atomizers are popular for the simple construction and wide turn-down ratio of their spill-return (SR) versions. In this work, we experimentally investigated a small SR PS atomizer with aim to find the effect of entry port number (2, 3 and 4), swirl chamber shape (hemispheric; conical; curved convex and flat conical), SR design (axial and off-axis spill orifices) and manufacturing precision on the spray quality and stability. The characteristics (droplet size in the spray, the spray cone angle, pressure pulsations and discharge coefficient) were studied using phase-Doppler anemometry, high-speed visualization and a pressure-fluctuation sensing. The tests were provided with Jet A-1 fuel at inlet pressures of 0.5, 1.0 and 1.5 MPa and for spill/feed ratios (SFRs) of 0.4 and 0.8. The swirl chamber shape influenced the spray stability; conical chambers were more stable than others. The spray was found circumferentially heterogeneous; its uniformity improved with the increases in the swirling inlets number and the inlet pressure. Atomizers with axial spill orifice at SFR = 0 demonstrated strong spray pulsations while atomizers with the off-axis spill orifices produced a stable spray. Periodical decay of the air core was suggested as the pulsation reason. The manufacturing precision, axial symmetry and matching of the surfaces of connected parts was found important for the spray symmetry and homogeneity.

Druh

D - Stať ve sborníku

CEP obor

JE - Nejaderná energetika, spotřeba a užití energie

OECD FORD obor

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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)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

27th European Conference on Liquid Atomization and Spray Systems

ISBN

978-1-910172-09-4

ISSN

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e-ISSN

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Počet stran výsledku

10

Strana od-do

1-12

Název nakladatele

Neuveden

Místo vydání

Brighton

Místo konání akce

Brighton

Datum konání akce

4. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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