Nové modifikace Effervescent trysek: vlastnsoti, výhody a nedostatky

Novel modifications of Effervescent Atomizer, Performance, Advantages and Drawbacks

conference paper

en

In this work we studied a single-hole effervescent atomizer spraying light heating oil with air as an atomising medium in the "outside-in" gas injection configuration. We focused on modification of geometry of the atomizer exit section. Two atomizers, one with moderate, and one with intense helical swirler in front of the exit orifice were designed to expand the spray cone angle by a swirl of the gas-liquid mixture. Performance of the atomizer modifications were compared with a plain-orifice atomizer. An experimental study of atomization process was made on cold test bench. Swirling the mixture led 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 cone expansion. The swirl effect diminishes with GLR rising above 15 %. Another two atomizers were designed with aim to reduce droplet size on the spray edge: an atomizer with secondary air at the exit orifice and an atomizer with seco

v této práci se věnujeme čtyřem novým modifikacím Effervescent trysek. Jde o dvě trysky se zavířením směsi před výstupním otvorem a dvě trysky se zavířením pomocí sekundárního vzduchu ve výstupním otvoru a za výástupním otvorem. Jsou popsány vlastnosti jejich spreje, výhody a nedostatky.

In this work we studied a single-hole effervescent atomizer spraying light heating oil with air as an atomising medium in the "outside-in" gas injection configuration. We focused on modification of geometry of the atomizer exit section. Two atomizers, one with moderate, and one with intense helical swirler in front of the exit orifice were designed to expand the spray cone angle by a swirl of the gas-liquid mixture. Performance of the atomizer modifications were compared with a plain-orifice atomizer. An experimental study of atomization process was made on cold test bench. Swirling the mixture led 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 cone expansion. The swirl effect diminishes with GLR rising above 15 %. Another two atomizers were designed with aim to reduce droplet size on the spray edge: an atomizer with secondary air at the exit orifice and an atomizer with seco

Effervescent trysky, sprej, velikost kapek, zavíření směsi, kužel spreje.

Effervescent Atomizer, spray, droplet size, spray cone

2010

06.09.2010

Tribun EU

Brno

978-80-7399-997-1

Proceedings of 23rd European Conference on Liquid Atomization and Spray Systems

1–5

5