VLASTNOSTI SPREJE GENEROVANÉHO VÍCEOTVOROVOU EFFERVESCENT TRYSKOU A POROVNÁNÍ SE STANDARDNÍ Y-TRYSKOU

Characterization of spray generated by multihole effervescent atomizer and comparison with standard Y-jet atomizer.

článek ve sborníku ve WoS nebo Scopus

en

The study of effervescent atomizers is being conducted with the aim to develop an effervescent atomizer for industrial burners that will generate a fine and stable spray in a large turn-down ratio, and provide a symmetrical flux distribution. The atomizer is powered with light heating oil and uses air as an atomizing medium. The atomizer is expected to replace Y-jet atomizer frequently used in burners. This research is a follow up of a research done previously with a single-hole effervescent atomizers with various geometrical features of both, the aerator and the body of the atomizer. Based on results of this study, four geometrical variants of a multi-hole effervescent atomizer were designed. All atomizers were investigated from the point of flow characteristics and operational conditions in the turn-down ratio 1:5. Results of this study are in another paper (1) presented by the same authors in these proceedings. Based on these results, atomizer with 6 orifices labeled as E8 was chosen for detailed measurements of SMD, velocity and fluxes. Results are compared with a standard Y-jet atomizer also with 6 individual orifices. In both atomizers, effervescent and Y-jet, the full cone that is formed by axis of individual orifices make 60 deg. SMD and velocities of droplets were measured with 1-component PDA system in horizontal plane 152mm from the orifice. Fluxes were measured with PLIF imaging system. Results show that SMD of the spray from both, effervescent and Y-jet atomizers are very similar as for the absolute minimum and maximum values, spray generated by effervescent atomizer is less affected by different fuel pressure and ALR. With Y-jet atomizer we can see asymmetry in SMD due to the impact of fuel and air streams in the mixing chamber which is projected also outside the atomizer. Distribution of fluxes show a certain nonuniformity as does also relative span factor which is one of the most useful parameters that correctly characterizes combustion process.

Článek popisuje výsledky pokračujícího výzkumu trysek typu effervescent, které jsou vyvíjeny za účelem nahradit v současnosti požívané Y trysky. Zaměřuje se na kvalitu atomizace, podrobně jsou dokumentovány profily SMD, rychlosti kapek, span a také hmotnostní toky v rovině kolmé na osu trysky. Výsledky jsou také porovnány s údaji na Y trysce.

The study of effervescent atomizers is being conducted with the aim to develop an effervescent atomizer for industrial burners that will generate a fine and stable spray in a large turn-down ratio, and provide a symmetrical flux distribution. The atomizer is powered with light heating oil and uses air as an atomizing medium. The atomizer is expected to replace Y-jet atomizer frequently used in burners. This research is a follow up of a research done previously with a single-hole effervescent atomizers with various geometrical features of both, the aerator and the body of the atomizer. Based on results of this study, four geometrical variants of a multi-hole effervescent atomizer were designed. All atomizers were investigated from the point of flow characteristics and operational conditions in the turn-down ratio 1:5. Results of this study are in another paper (1) presented by the same authors in these proceedings. Based on these results, atomizer with 6 orifices labeled as E8 was chosen for detailed measurements of SMD, velocity and fluxes. Results are compared with a standard Y-jet atomizer also with 6 individual orifices. In both atomizers, effervescent and Y-jet, the full cone that is formed by axis of individual orifices make 60 deg. SMD and velocities of droplets were measured with 1-component PDA system in horizontal plane 152mm from the orifice. Fluxes were measured with PLIF imaging system. Results show that SMD of the spray from both, effervescent and Y-jet atomizers are very similar as for the absolute minimum and maximum values, spray generated by effervescent atomizer is less affected by different fuel pressure and ALR. With Y-jet atomizer we can see asymmetry in SMD due to the impact of fuel and air streams in the mixing chamber which is projected also outside the atomizer. Distribution of fluxes show a certain nonuniformity as does also relative span factor which is one of the most useful parameters that correctly characterizes combustion process.

kvalita spreje, effervescent atomizer, porovnání, Y-jet atomizer

spray quality, multihole effervescent atomizer, comparison, Y-jet atomizer

2003

13.07.2003

Illas Europe

Sorrento, Italy

88-88104-03-8

9th International Conference on Liquid Atomization and Spray Systems - ICLASS 2003

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