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EXPERIMENTAL INVESTIGATIONS ON THE ROLE OF GROUP COMBUSTION MODE IN LIFTED SPRAY FLAMES WITH KEROSENE FUEL
Journal
Atomization and Sprays
ISSN
10445110
Date Issued
2022-01-01
Author(s)
Potdar, Umesh
Kumar, Sudarshan
Abstract
Detailed experimental investigations on lifted spray flames were conducted to identify the various combustion modes using group combustion number analysis with kerosene fuel. Detailed droplet size and droplet velocity measurements using shadowgraphy and particle image velocimetry helped obtain the group combustion number and dimensionless droplet separation distance. Internal group combustion mode was observed at lower injection pressures (3 bar) in which individual droplet combustion was significant. The combustion mode was defined by internal group combustion with a double reaction zone at intermediate pressures. The inner reaction zone burned with local extinction, and the outer reaction zone burned like a diffusion flame. A group combustion number range of 1–103 was considered for various combustion modes in lifted spray flames without coflow air. For air coflow conditions (Vcoflow = 0.4 m/s), both the individual droplet burning mode and double reaction zone flame structure disappear from the flame. Small fuel vapor clouds burning with the external group combustion mode at higher injection pressures were observed in the G range of 103–106.
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