Measuring air core characteristics of a pressure-swirl atomizer via a transparent acrylic nozzle at various Reynolds numbers
- Authors
- Lee, E.J.; Oh, S.Y.; Kim, H.Y.; James, S.C.; Yoon, S.S.
- Issue Date
- 2010
- Keywords
- Air core; Fuel injector performance; Swirl spray; Temperature effect
- Citation
- Experimental Thermal and Fluid Science, v.34, no.8, pp.1475 - 1483
- Indexed
- SCIE
SCOPUS
- Journal Title
- Experimental Thermal and Fluid Science
- Volume
- 34
- Number
- 8
- Start Page
- 1475
- End Page
- 1483
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118327
- DOI
- 10.1016/j.expthermflusci.2010.07.010
- ISSN
- 0894-1777
- Abstract
- Because of thermal fluid-property dependence, atomization stability (or flow regime) can change even at fixed operating conditions when subject to temperature change. Particularly at low temperatures, fuel's high viscosity can prevent a pressure-swirl (or simplex) atomizer from sustaining a centrifugal-driven air core within the fuel injector. During disruption of the air core inside an injector, spray characteristics outside the nozzle reflect a highly unstable, nonlinear mode where air core length, Sauter mean diameter (SMD), cone angle, and discharge coefficient variability. To better understand injector performance, these characteristics of the pressure-swirl atomizer were experimentally investigated and data were correlated to Reynolds numbers (Re). Using a transparent acrylic nozzle, the air core length, SMD, cone angle, and discharge coefficient are observed as a function of Re. The critical Reynolds numbers that distinguish the transition from unstable mode to transitional mode and eventually to a stable mode are reported. The working fluids are diesel and a kerosene-based fuel, referred to as bunker-A. © 2010 Elsevier Inc.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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