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.
| Original language | English |
|---|---|
| Pages (from-to) | 1475-1483 |
| Number of pages | 9 |
| Journal | Experimental Thermal and Fluid Science |
| Volume | 34 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2010 Nov 1 |
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Keywords
- Air core
- Fuel injector performance
- Swirl spray
- Temperature effect
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering
- Chemical Engineering(all)
- Aerospace Engineering
- Nuclear Energy and Engineering
Cite this
Measuring air core characteristics of a pressure-swirl atomizer via a transparent acrylic nozzle at various Reynolds numbers. / Lee, Eun J.; Oh, Sang Youp; Kim, Ho Y.; James, Scott C.; Yoon, Suk Goo.
In: Experimental Thermal and Fluid Science, Vol. 34, No. 8, 01.11.2010, p. 1475-1483.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Measuring air core characteristics of a pressure-swirl atomizer via a transparent acrylic nozzle at various Reynolds numbers
AU - Lee, Eun J.
AU - Oh, Sang Youp
AU - Kim, Ho Y.
AU - James, Scott C.
AU - Yoon, Suk Goo
PY - 2010/11/1
Y1 - 2010/11/1
N2 - 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.
AB - 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.
KW - Air core
KW - Fuel injector performance
KW - Swirl spray
KW - Temperature effect
UR - http://www.scopus.com/inward/record.url?scp=77956175378&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77956175378&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2010.07.010
DO - 10.1016/j.expthermflusci.2010.07.010
M3 - Article
AN - SCOPUS:77956175378
VL - 34
SP - 1475
EP - 1483
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
SN - 0894-1777
IS - 8
ER -