Effervescent Atomizér pro rozprašování suspenzí s velkými částicemi

Effervescent Atomizer for Atomization of Suspensions Containing Large Particles

conference paper

en

Single-hole effervescent atomizer in outside-in gas injection configuration is designed for spraying of waste fuels. An experimental study of atomization process is performed on cold test bench. The waste fuel is simulated using light heating oil (LHO) loaded with solid spherical particles in the size range 1 to 1.5 mm and mass concentration 10 %. Our first results show negligible effect of the particles loaded in the suspension on the final spray. Spray cone angle of the single-hole atomizer is extended by a swirl of the gas-suspension mixture in front of the exit orifice. Three atomizers were fabricated to test the effect of swirl chamber on the spray: atomizer without swirler, atomizer with moderate swirler and atomizer with intense swirler. Swirling the mixture leads to a significant increase of the spray cone angle at low gas to liquid ratio by mass (GLR). An increase of the gas mass fraction in the mixture inhibits the swirl action on the spray shape. The swirl effect diminishes with GLR rising above 15 %.

Jednoduchý effervescent atomizér je navržen pro atomizaci odpadních paliv. exoperimentální studie atomizace je prováděna na studeném zkušebním stavu. Odpadní palivo je simulováno pomocí suspenze lehkého topného oleje a polystyrenových částic velikosti 1-1.5 mm v koncentraci 10 %. První výsledky ukazují, že vliv částic v suspenzi na atomizační proces je minimální. Úhel kužele spreje byl rozšířen zavířením směsi na výstupu trysky. Byly vyrobeny a testovány 3 trysky: bez zavíření, s mírným a silným zavířením. Výsledky ukazují, že zavíření směsi vede k výrazně širšímu úhlu kužele spreje při nízkých GLR. S růstem GLR tento efekt je potlačen a mizí pokud GLR roste nad 15 %.

Single-hole effervescent atomizer in outside-in gas injection configuration is designed for spraying of waste fuels. An experimental study of atomization process is performed on cold test bench. The waste fuel is simulated using light heating oil (LHO) loaded with solid spherical particles in the size range 1 to 1.5 mm and mass concentration 10 %. Our first results show negligible effect of the particles loaded in the suspension on the final spray. Spray cone angle of the single-hole atomizer is extended by a swirl of the gas-suspension mixture in front of the exit orifice. Three atomizers were fabricated to test the effect of swirl chamber on the spray: atomizer without swirler, atomizer with moderate swirler and atomizer with intense swirler. Swirling the mixture leads to a significant increase of the spray cone angle at low gas to liquid ratio by mass (GLR). An increase of the gas mass fraction in the mixture inhibits the swirl action on the spray shape. The swirl effect diminishes with GLR rising above 15 %.

Effervescent Atomizér, Suspenye, odpadní paliva, úhel kužele spreje, Struktura spreje

Effervescent Atomizer, Suspensions, Waste Fuels, Spray Cone Half-Angle, Spray Structure

2008

08.09.2008

Politecnico di Milano

Como Lake, Italy

978-88-903712-0-2

Sborník z 22 Annual Conference on Liquid Atomization and Spray Systems (Ilass 2008 Como Lake

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